IESVE for Early Stage Design and Planning

IESVE for Early Stage
Design & Planning
Achieving Excellence Session #4
Niall Gibson – Head of IESVE Sales, UK
Douglas Bell – Daylighting & BIM Consultancy Manager
22nd May 2024

Achieving Excellence with IESVE
Webinar Series
www.iesve.com
— Session 1: Keep Your Cool with the Building Regulations - Part O
— go.iesve.com/achieving-excellence-webinar-building-regulations-part-o/eshot
— Session 2: M&V for Building Performance
— go.iesve.com/achieving-excellence-webinar-m-and-v-for-building-performance/eshot
— Session 3: IESVE for HVAC Simulation
— go.iesve.com/achieving-excellence-webinar-iesve-for-hvac-simulation/eshot

www.iesve.com
— Interoperability:
— Revit, SketchUp, Rhino
— gbXML, Pollination (.GEM)
— Daylight & Sunlight Studies:
— Why & When – Standards & Guidance
— IESVE Sunlight & Daylight
— Case Study: Multi-Residential Apartment Block
What will be covered?

Performance Drivers
www.iesve.com
Never too early for Building Performance Modelling

IESVE for Early Stage Design & Planning
www.iesve.com
Sunlight & Daylight
Why & When?

Guidance / Standards
www.iesve.com

The London Plan
— The Mayor of London intends to produce a single guidance
document
— Adequate sized rooms
— Maximise dual aspect apartments
— Single aspect only provided where appropriate design
solution
— Design development should provide sufficient daylight &
sunlight to new & existing housing
— Wind, daylight, sunlight penetration & temperature
conditions around the buildings carefully considered.
www.iesve.com

When Daylight & Sunlight Should Be Utilised
Conceptual Design Studies
— Shadow Analysis
— Sunlight – Existing/Proposed Amenity Spaces
— Sunlight – Existing Buildings
— Sunlight – Proposed Buildings (Window Positions Estimated)
— Daylight to Existing Buildings
Why at Conceptual Design?
— You can change it
— Mitigate risk
— Avoid Retrofit
— Analysis is cheap
Detailed Design
— Sunlight to Proposed Buildings
— Daylight to Proposed Buildings
www.iesve.com

www.iesve.com
Interoperability

Interoperability
www.iesve.com

www.iesve.com
IESVE – Sunlight & Daylight

IESVE – Sunlight & Daylight
www.iesve.com

www.iesve.com
Analysis – Case Study

Design Tools – Massing Options
www.iesve.com
Massing Option 1 Massing Option 3
Massing Option 2

Massing Options
www.iesve.com
Massing Option 1 Massing Option 2 Massing Option 3

Sunlight to Proposed Amenities
www.iesve.com
Section 3.3.17 of the BRE Guide (3rd Edition), for a space to appear adequately sunlit
throughout the year, at least half of the garden or amenity space should receive at least 2 hours
of sunlight on March 21st.

The below screenshots show the absolute scale showing all hours of sunlight received on this
amenity for the 4 massing options.
www.iesve.com

The below screenshots show the Sunlight Received for a minimum of 2 hours for the proposed
amenity area in the 4 massing options.
www.iesve.com
Receives more than 2 hours of sunlight
Receives less than 2 hours of sunlight

www.iesve.com
Total
Area
(m2)
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Comment
Total Area
(m2)
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Comment
Total Area
(m2)
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Comment
1,220 421 35% x 1,300 950 73% ✓ 958 650 68% ✓
2 hours of sunlight on March 21st
— Option 1: 35%
— Option 2: 73%
— Option 3: 69%

Sunlight to Existing Amenities
Section 3.3.17 of the BRE Guide (3rd Edition), Existing amenity
spaces, if they are already below the 50% threshold then the BRE
recommends the results kept to within 80% of the existing
situation.
www.iesve.com
Existing Situation

The below screenshots show the absolute scale showing all hours
of sunlight received on this amenity for the 4 massing options as
well as the existing situation.
www.iesve.com
Existing Situation

www.iesve.com
Existing Situation

www.iesve.com
Total
Area
(m2)
Existing Situation Massing Option 1 Massing Option 2 Massing Option 3
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Op1 vs
Existing
Comment
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Op2 vs
Existing
Comment
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Op3 vs
Existing
Comment
3,259 2,867 88% 2,301 71% 80% ✓ 2,742 84% 96% ✓ 2,343 72% 82% ✓
Comparison for the results between four massing options and the
existing situation.

Daylight to Existing Buildings
The Vertical Sky Component (VSC) definition from the BRE Guide (3rd Edition) is described below:
“This is a measure of the amount of light reaching a window. It is the ratio of that part of illuminance,
at a point on a given vertical plane, that is received directly from a CIE standard overcast sky, to
illuminance on a horizontal plane due to an obstructed hemisphere of this sky. Usually the ‘given
vertical plane’ is the outside of a window wall. The VSC does not include reflected light, either from the
ground or from other buildings.”
The maximum possible VSC value for an opening in a vertical wall, assuming no obstructions, is 40%. This
VSC at any given point can be tested in RadianceIES, a module of IES VE.
For typical residential schemes the BRE Guide (3nd Edition) states the following in Section 2.2.7:
“If this VSC is greater than 27% then enough skylight should still be reaching the window of the existing
building. Any reduction below this level should be kept to a minimum. If the VSC, with the new
development in place, is both less that 27% and less than 0.8 times its former value, occupants of the
existing building will notice the reduction in the amount of skylight. The area lit by the window is likely
to appear more gloomy, and electric lighting will be needed more of the time.”
www.iesve.com

www.iesve.com
Building 1
Building 2
Building 3
Building 4

Building 1 – Reference Image
www.iesve.com

www.iesve.com
Comparison between Existing and Proposed for Building 1
Ref:
Existing Situation
VSC
Proposed
Situation
VSC
Proposed VSC as a %
of Existing Situation
Comment
Proposed
Situation
VSC
Proposed VSC as a %
Comment
Proposed Situation
VSC
Proposed VSC as a %
Comment
1 38.91 33.90 92% ✓ 38.74 100% ✓ 26.68 72% x
2 38.49 32.50 85% ✓ 38.42 100% ✓ 26.46 69% x
3 37.65 31.04 82% ✓ 37.44 99% ✓ 26.03 69% x
4 36.9 29.67 80% ✓ 36 98% ✓ 25.06 67% x
5 35.84 28.95 87% ✓ 33.98 100% ✓ 25.02 75% x
6 34.31 26.90 76% x 31.43 92% ✓ 24.15 68% x
7 32.26 25.70 75% x 29.09 90% ✓ 22.97 67% x
8 29.8 24.31 73% x 27.12 91% ✓ 21.96 66% x
9 27.71 22.99 71% x 24.96 90% ✓ 21.35 66% x
10 39.11 26.76 68% x 38.9 99% ✓ 21.73 56% x
11 38.62 24.97 65% x 38.4 99% ✓ 21.73 56% x
12 37.96 23.36 61% x 37.79 100% ✓ 21.37 56% x
13 37.15 22.13 59% x 34.4 93% ✓ 20.48 54% x
14 36.19 20.97 57% x 30.49 84% ✓ 20.27 55% x
15 32.41 20.03 56% x 26.17 81% ✓ 20.07 56% x
16 30.25 18.35 53% x 24.07 80% ✓ 19.16 55% x
17 27.62 18.40 54% x 21.36 77% x 18.93 56% x
18 24.93 17.19 53% x 20.12 81% ✓ 17.89 55% x
19 39.06 17.48 45% x 38.78 99% ✓ 14.36 37% x
20 38.53 14.44 37% x 38.55 100% ✓ 14.31 37% x
21 38 12.26 32% x 37.94 100% ✓ 14.19 37% x
22 37.16 10.48 28% x 32.35 87% ✓ 13.88 37% x
23 35.74 9.90 27% x 25.42 71% x 13.85 37% x
24 31.25 8.49 24% x 19.18 61% x 13.39 37% x
25 26.64 7.68 22% x 15.31 57% x 12.57 36% x
26 22.45 7.79 23% x 12.58 56% x 12.12 36% x
27 19.24 7.33 22% x 10.67 55% x 11.10 34% x
X
The points tested have a VSC value
less than 0.8 times the existing
scheme VSC value and are less than
15%.
✓
greater than 27%, or their VSC value
is greater than 0.8 times their
former value, with the proposed
development in place. Therefore,
these points exceed BRE
recommendations.

Building 1
When compared to the Existing Situation, for the tested points in Building 1, the number of points in
line with the recommended values as set out in the BRE Guidelines:
− Option 1: 19% (5 out of 27 points)
Compliant
Non Compliant
www.iesve.com

www.iesve.com

www.iesve.com
Comparison between Existing and Proposed for Building 4
X
less than 0.8 times the existing
scheme VSC value and are less than
15%.
✓
greater than 27%, or their VSC value
is greater than 0.8 times their
former value, with the proposed
development in place. Therefore,
these points exceed BRE
recommendations.
Ref:
Existing
Situation VSC
Proposed
Situation VSC
Proposed VSC as a % of
Existing Situation
Comment
Proposed
Situation VSC
Proposed VSC as a
% of Existing
Situation
Comment
Proposed
Situation VSC
Existing Situation
Comment
1 38.74 38.07 98% ✓ 37.37 96% ✓ 35.97 93% ✓
2 37.74 37.11 98% ✓ 35.92 95% ✓ 35.23 93% ✓
3 38.79 37.95 98% ✓ 36.13 93% ✓ 35.27 91% ✓
4 37.77 37.05 98% ✓ 33.97 90% ✓ 34.76 92% ✓
5 32.68 32.50 99% ✓ 31.79 97% ✓ 28.29 87% ✓
6 37.36 35.41 95% ✓ 36.01 96% ✓ 30.03 80% ✓
7 38.15 36.53 96% ✓ 37.54 98% ✓ 31.97 84% ✓
8 37.11 35.69 96% ✓ 36.62 99% ✓ 31.15 84% ✓
9 34.39 33.96 99% ✓ 31.98 93% ✓ 32.73 95% ✓
10 31.05 31.15 100% ✓ 29.18 94% ✓ 29.57 95% ✓
11 27.8 28.01 101% ✓ 25.77 93% ✓ 27.09 97% ✓
12 24.86 25.35 102% ✓ 22.85 92% ✓ 24.40 98% ✓
13 22.4 22.56 101% ✓ 20.62 92% ✓ 21.77 97% ✓
14 35.45 35.08 99% ✓ 30.82 87% ✓ 33.53 95% ✓
15 32.52 32.67 100% ✓ 27.74 85% ✓ 31.15 96% ✓
16 29.52 30.00 102% ✓ 25.43 86% ✓ 28.94 98% ✓
17 26.99 26.87 100% ✓ 22.72 84% ✓ 26.16 97% ✓
18 24.17 24.12 100% ✓ 20.24 84% ✓ 22.69 94% ✓
19 35.01 35.29 101% ✓ 26.25 75% x 33.03 94% ✓
20 32.19 33.43 104% ✓ 23.53 73% x 31.35 97% ✓
21 29.15 29.16 100% ✓ 21.13 72% x 29.08 100% ✓
22 26.07 24.69 95% ✓ 19.46 75% x 24.14 93% ✓
23 23.35 21.53 92% ✓ 17.33 74% x 19.78 85% ✓
24 17.75 14.98 84% ✓ 16.29 92% ✓ 11.58 65% x
25 17.62 14.89 85% ✓ 16.51 94% ✓ 11.88 67% x
26 16.59 13.53 82% ✓ 14.79 89% ✓ 11.43 69% x
27 14.65 12.64 86% ✓ 13.49 92% ✓ 10.36 71% x
28 13.8 11.38 82% ✓ 12.74 92% ✓ 10.35 75% x
29 13.38 11.36 85% ✓ 13.21 99% ✓ 10.39 78% x
30 36.62 34.25 94% ✓ 35.75 98% ✓ 29.74 81% ✓
31 35.64 33.14 93% ✓ 34.49 97% ✓ 28.91 81% ✓
32 34.2 31.59 92% ✓ 32.85 96% ✓ 28.04 82% ✓
33 32.25 30.21 94% ✓ 31.03 96% ✓ 26.71 83% ✓
34 30.81 28.68 93% ✓ 29.54 96% ✓ 25.37 82% ✓
35 14.25 12.20 86% ✓ 14.00 98% ✓ 11.36 80% ✓

Building 4
When compared to the Existing Situation, for the tested points in Building 4, the no. of points that are
in line with the recommended values as set out in the BRE Guidelines:
Compliant
Non Compliant
www.iesve.com

Sunlight to Existing Buildings
The BRE Guide (3rd Edition) states that interiors where the occupants expect sunlight should receive at least one
quarter (25%) of annual probable sunlight hours, including at least 5% of annual probable sunlight hours during the
winter months, between 21st September and 21st March.
“If a living room of an existing dwelling has a main window facing within 90° of due south, and any part of a new
development subtends an angle of more than 25° to the horizontal measured from the centre of the window in a
vertical section perpendicular to the window, then the sunlight of the existing dwelling may be adversely affected.
This will be the case if the centre of the window:
- Receives less than 25% of annual probable sunlight hours and less than 0.80 times its former annual value: or les
than 5% of annual probable sunlight hours between 21 September and 21 March and less than 0.80 times its
former value during that period:
- And also has a reduction in sunlight received over the whole year greater than 4% of annual probable sunlight
hours.”
If a window reference point can receive more than 25% of annual probable sunlight hours, including at least 5% of
annual probable sunlight hours during the winter months between 21st September and 21st March, then the room
should still receive enough sunlight. Any reduction in sunlight access below this level should be kept to a minimum.
If the available sunlight hours are both less than the amount given and less than 0.8 times their former value, either
over the whole year or just during the winter months (21st September to 21st March) and reduction in sunlight across
the year has a greater reduction than 4%, then the occupants of the existing building will notice the loss of sunlight.
www.iesve.com

www.iesve.com

www.iesve.com
✓/✓
Both the Proposed Scheme annual and
winter APSH results are greater than
25% and 5% respectively, or are
greater than 0.8 times their former
value or are less than 4% overall
annual loss with the proposed
development in place.
✓/X
The annual APSH results are greater
than 25% or are greater than 0.8 times
their former value with the proposed
development in place, however, the
winter results are below the
guidelines.
X/✓
The annual APSH results are less than
the recommended values, however,
the winter APSH results are greater
than 5% or greater than 0.8 times their
former value with the proposed
X/X
Both the annual and winter APSH
results are less than 25% and 5%
respectively, and less than 0.8 times
their former value or are greater than
4% overall annual loss with the
proposed development in place.
Ref:
Existing
Situation
Annual Winter Annual Winter
Proposed
APSH
as a % of
Existing
(Annual)
Proposed
APSH
as a % of
Existing
(Winter)
Comment Annual Winter
Proposed APSH
as a % of
Existing
(Annual)
Proposed APSH
as a % of
Existing
(Winter)
Proposed
APSH
as a % of
Existing
(Annual)
Proposed APSH
as a % of Existing
(Winter)
Comment
1 74.12 33.44 72.42 31.28 98% 94% ✓/✓ 72.57 31.63 98% 95% ✓/✓ 65.09 26.20 88% 78% ✓/✓
2 72.2 31.23 68.94 27.92 95% 89% ✓/✓ 67.46 26.36 93% 84% ✓/✓ 63.30 23.30 88% 75% ✓/✓
3 74.64 33.66 72.04 31.07 97% 92% ✓/✓ 70.77 29.80 95% 89% ✓/✓ 64.90 26.03 87% 77% ✓/✓
4 72.1 31.78 68.78 28.46 95% 90% ✓/✓ 64.82 24.50 90% 77% ✓/✓ 61.83 24.29 86% 76% ✓/✓
5 54.6 26.03 51.99 23.41 95% 90% ✓/✓ 50.56 20.78 93% 80% ✓/✓ 44.73 18.64 82% 72% ✓/✓
6 59.86 27.07 57.48 24.69 96% 91% ✓/✓ 53.59 20.80 90% 77% ✓/✓ 49.44 19.43 83% 72% ✓/✓
7 61.65 28.47 60.26 27.08 98% 95% ✓/✓ 59.75 26.57 97% 93% ✓/✓ 51.21 19.96 83% 70% ✓/✓
8 59.82 27.73 58.27 26.18 97% 94% ✓/✓ 55.43 23.34 93% 84% ✓/✓ 49.20 18.69 82% 67% ✓/✓
9 65.77 25.86 61.75 21.88 94% 85% ✓/✓ 58.80 18.93 89% 73% ✓/✓ 57.23 19.45 87% 75% ✓/✓
10 60.44 21.87 56.62 18.07 94% 83% ✓/✓ 52.77 14.23 87% 65% ✓/✓ 53.40 16.94 88% 77% ✓/✓
11 55.16 18.59 53.00 16.47 96% 89% ✓/✓ 49.50 13.41 90% 72% ✓/✓ 50.64 16.19 92% 87% ✓/✓
12 48.55 15.34 47.77 14.59 98% 95% ✓/✓ 44.24 12.42 91% 81% ✓/✓ 46.07 14.98 95% 98% ✓/✓
13 42.82 12.54 43.20 12.93 101% 103% ✓/✓ 39.12 11.36 91% 91% ✓/✓ 40.22 12.04 94% 96% ✓/✓
14 68.39 28.66 65.33 25.63 96% 89% ✓/✓ 57.61 17.92 84% 63% ✓/✓ 58.80 21.65 86% 76% ✓/✓
15 62.03 24.38 59.99 22.36 97% 92% ✓/✓ 52.14 15.70 84% 64% ✓/✓ 54.37 19.93 88% 82% ✓/✓
16 57.44 21.84 54.55 16.97 95% 77% ✓/✓ 47.74 14.16 83% 65% ✓/✓ 51.13 19.02 89% 87% ✓/✓
17 51.5 17.98 48.89 15.40 95% 86% ✓/✓ 43.19 13.03 84% 72% ✓/✓ 44.71 14.69 87% 82% ✓/✓
18 44.6 13.45 43.52 12.39 98% 92% ✓/✓ 38.74 11.68 87% 87% ✓/✓ 38.22 10.56 86% 79% ✓/✓
19 67 27.61 64.95 25.57 97% 93% ✓/✓ 51.75 14.71 77% 53% ✓/✓ 57.68 21.81 86% 79% ✓/✓
20 62.03 23.9 61.67 23.54 99% 98% ✓/✓ 47.21 13.38 76% 56% ✓/✓ 56.36 21.73 91% 91% ✓/✓
21 55.39 19.64 51.40 15.66 93% 80% ✓/✓ 39.64 10.53 72% 54% ✓/✓ 50.40 18.69 91% 95% ✓/✓
22 46.5 12.95 43.36 9.95 93% 77% ✓/✓ 34.37 8.38 74% 65% ✓/✓ 38.46 9.78 83% 76% ✓/✓
23 42.28 11.32 37.94 7.78 90% 69% ✓/✓ 30.40 8.35 72% 74% ✓/✓ 30.93 5.93 73% 52% ✓/✓
24 24.09 13.38 19.41 8.70 81% 65% ✓/✓ 23.17 12.46 96% 93% ✓/✓ 15.53 5.90 64% 44% x/✓
25 24.49 13.06 18.87 7.44 77% 57% x/x 22.02 10.59 90% 81% ✓/✓ 15.87 5.65 65% 43% x/✓
26 22.56 11.13 17.03 5.60 75% 50% x/x 19.76 8.32 88% 75% ✓/✓ 14.26 4.04 63% 36% x/x
27 18.71 7.6 14.80 3.70 79% 49% x/x 17.07 5.97 91% 79% ✓/✓ 13.10 3.21 70% 42% x/x
28 16.28 5.29 13.03 2.04 80% 39% x/x 15.48 4.49 95% 85% ✓/✓ 11.98 2.20 74% 42% x/x
29 16.4 3.8 14.48 1.88 88% 49% x/x 15.98 3.39 97% 89% ✓/✓ 13.00 1.57 79% 41% x/x
30 57.86 25.75 53.96 21.87 93% 85% ✓/✓ 52.40 20.31 91% 79% ✓/✓ 45.96 17.33 79% 67% ✓/✓
31 55.64 23.57 51.99 20.05 93% 85% ✓/✓ 50.63 18.69 91% 79% ✓/✓ 45.33 16.84 81% 71% ✓/✓
32 52.04 21.5 47.62 15.83 92% 74% ✓/✓ 47.06 15.97 90% 74% ✓/✓ 44.27 15.94 85% 74% ✓/✓
33 48.21 18.15 41.03 11.17 85% 62% ✓/✓ 41.41 12.47 86% 69% ✓/✓ 39.28 13.57 81% 75% ✓/✓
34 41.27 11.65 37.49 8.03 91% 69% ✓/✓ 38.00 10.22 92% 88% ✓/✓ 33.75 8.38 82% 72% ✓/✓
35 17.91 6.36 15.11 3.03 84% 48% ✓/ x 18.12 6.29 101% 99% ✓/✓ 14.23 2.99 79% 47% ✓/✓

Building 4
− Option 1: 29 no. (83%)
− Option 2: 35 no.(100%)
− Option 3: 28 no. (80%)
Compliant
Non Compliant
www.iesve.com

Massing Options
Massing Option 2a
www.iesve.com

Section 3.3.17 of the BRE Guide (3rd Edition), for a space to appear adequately sunlit throughout the year, at least
half of the garden or amenity space should receive at least 2 hours of sunlight on March 21st.
www.iesve.com
Massing Option 2a

Massing Option 1
The below screenshots show the absolute scale showing all hours of sunlight received on this
amenity for the 4 massing options.
www.iesve.com
Massing Option 2 Massing Option 2a Massing Option 3

Massing Option 1
The below screenshots show the Sunlight Received for a minimum of 2 hours for the proposed
amenity area in the 4 massing options.
www.iesve.com

www.iesve.com
The below table shows a comparison for the results between the three massing options.
Massing Option 1 Massing Option 2 Massing Option 2a Massing Option 3
Total
Area
(m2)
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Comment
Total Area
(m2)
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Comment
Total Area
(m2)
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Comment
Total Area
(m2)
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Comment
1,220 421 35% x 1,300 950 73% ✓ 1,260 950 75% ✓ 958 650 68% ✓
On March 21st, the percentage of the proposed amenity areas that receives at least 2 hours of
sunlight is listed below for each massing option:
− Option 1: 35%
− Option 2: 73%
− Option 2a: 75%
− Option 3: 68%
Options 2, 2a and 3 are complying with the BRE recommendations, while Option 1 is not.

As outlined in Section 3.3.17 of the BRE Guide (3rd Edition), in
the case of existing amenity spaces, if they are already below
the 50% threshold then the BRE recommends the results kept to
within 80% of the existing situation.
This analysis will be performed on the amenity space illustrated
in the images below for all four massing options.
Massing Option 1
www.iesve.com
Existing Situation

Massing Option 1
www.iesve.com
Existing Situation

www.iesve.com
The below table shows a comparison for the results between the four massing options and the
existing situation.
All four massing options are passing the BRE recommendations with over 50% of the amenity
area receiving at least 2 hours of sunlight on March 21st. Options 2 and 2a are the closest to the
existing situation.
Total
Area
(m2)
Existing Situation Massing Option 1 Massing Option 2 Massing Option 2a Massing Option 3
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Op1 vs
Existing
Comment
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Op2 vs
Existing
Comment
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Op2a vs
Existing
Comment
Area
Receiving
>2h (m2)
Percent
Receiving
>2h
Op3 vs
Existing
Comment
3,259 2,867 88% 2,301 71% 80% ✓ 2,742 84% 96% ✓ 2,742 84% 96% ✓ 2,343 72% 82% ✓

Ref:
Existing Situation
VSC
Proposed Situation
VSC
Existing Situation
Comment
Proposed Situation
VSC
Proposed VSC as a %
Comment
Proposed Situation
VSC
Existing Situation
Comment
Proposed Situation
VSC
Proposed VSC as a %
Comment
1 38.91 33.90 92% ✓ 38.74 100% ✓ 38.53 100% ✓ 26.68 72% x
2 38.49 32.50 85% ✓ 38.42 100% ✓ 38.56 100% ✓ 26.46 69% x
3 37.65 31.04 82% ✓ 37.44 99% ✓ 37.74 100% ✓ 26.03 69% x
4 36.9 29.67 80% ✓ 36 98% ✓ 36.33 98% ✓ 25.06 67% x
5 35.84 28.95 87% ✓ 33.98 100% ✓ 34.49 100% ✓ 25.02 75% x
6 34.31 26.90 76% x 31.43 92% ✓ 31.90 93% ✓ 24.15 68% x
7 32.26 25.70 75% x 29.09 90% ✓ 29.75 92% ✓ 22.97 67% x
8 29.8 24.31 73% x 27.12 91% ✓ 27.23 91% ✓ 21.96 66% x
9 27.71 22.99 71% x 24.96 90% ✓ 25.87 93% ✓ 21.35 66% x
10 39.11 26.76 68% x 38.9 99% ✓ 38.81 99% ✓ 21.73 56% x
11 38.62 24.97 65% x 38.4 99% ✓ 38.65 100% ✓ 21.73 56% x
12 37.96 23.36 61% x 37.79 100% ✓ 38.11 100% ✓ 21.37 56% x
13 37.15 22.13 59% x 34.4 93% ✓ 34.98 94% ✓ 20.48 54% x
14 36.19 20.97 57% x 30.49 84% ✓ 30.81 85% ✓ 20.27 55% x
15 32.41 20.03 56% x 26.17 81% ✓ 27.29 84% ✓ 20.07 56% x
16 30.25 18.35 53% x 24.07 80% ✓ 24.74 82% ✓ 19.16 55% x
17 27.62 18.40 54% x 21.36 77% x 22.28 81% ✓ 18.93 56% x
18 24.93 17.19 53% x 20.12 81% ✓ 20.77 83% ✓ 17.89 55% x
19 39.06 17.48 45% x 38.78 99% ✓ 39.06 100% ✓ 14.36 37% x
20 38.53 14.44 37% x 38.55 100% ✓ 37.9 98% ✓ 14.31 37% x
21 38 12.26 32% x 37.94 100% ✓ 38.11 100% ✓ 14.19 37% x
22 37.16 10.48 28% x 32.35 87% ✓ 34.45 93% ✓ 13.88 37% x
23 35.74 9.90 27% x 25.42 71% x 28.69 80% ✓ 13.85 37% x
24 31.25 8.49 24% x 19.18 61% x 22.98 74% x 13.39 37% x
25 26.64 7.68 22% x 15.31 57% x 18.55 70% x 12.57 36% x
26 22.45 7.79 23% x 12.58 56% x 15.22 68% x 12.12 36% x
27 19.24 7.33 22% x 10.67 55% x 12.96 67% x 11.10 34% x
www.iesve.com
X - The points tested have a VSC value less than 0.8 times the existing scheme VSC value and are less than 15%.
✓- The points tested have a VSC value greater than 27%, or their VSC value is greater than 0.8 times their former value, with the proposed development in place. Therefore, these points
exceed BRE recommendations.
Table Comparison between Existing and Proposed for Building 1

Building 1
When compared to the Existing Situation, for the tested points in Building 1, the number of points in
line with the recommended values as set out in the BRE Guidelines:
− Option 2:78% (21 out of 27 points)
− Option 2a: 85% (23 out of 27 points)
Massing Option 1 Massing Option 2 Massing Option 2a
Compliant
Non Compliant
Massing Option 3
www.iesve.com

www.iesve.com
X - The points tested have a VSC value less than 0.8 times the existing scheme VSC value and are less than 15%.
✓- The points tested have a VSC value greater than 27%, or their VSC value is greater than 0.8 times their former value, with the proposed development in place.
Therefore, these points exceed BRE recommendations.
Table Comparison between Existing and Proposed for Building 4
Ref:
Existing
Situation VSC
Proposed
Situation VSC
Proposed VSC as a %
Comment
Proposed
Situation VSC
Proposed VSC as a %
Comment
Proposed
Situation VSC
Proposed VSC as a %
Comment
Proposed
Situation VSC
Proposed VSC as a %
Comment
1 38.74 38.07 98% ✓ 37.37 96% ✓ 38.84 100% ✓ 35.97 93% ✓
2 37.74 37.11 98% ✓ 35.92 95% ✓ 38.02 101% ✓ 35.23 93% ✓
3 38.79 37.95 98% ✓ 36.13 93% ✓ 38.86 100% ✓ 35.27 91% ✓
4 37.77 37.05 98% ✓ 33.97 90% ✓ 37.93 100% ✓ 34.76 92% ✓
5 32.68 32.50 99% ✓ 31.79 97% ✓ 32.75 100% ✓ 28.29 87% ✓
6 37.36 35.41 95% ✓ 36.01 96% ✓ 37.43 100% ✓ 30.03 80% ✓
7 38.15 36.53 96% ✓ 37.54 98% ✓ 38.1 100% ✓ 31.97 84% ✓
8 37.11 35.69 96% ✓ 36.62 99% ✓ 37.24 100% ✓ 31.15 84% ✓
9 34.39 33.96 99% ✓ 31.98 93% ✓ 34.76 101% ✓ 32.73 95% ✓
10 31.05 31.15 100% ✓ 29.18 94% ✓ 31.47 101% ✓ 29.57 95% ✓
11 27.8 28.01 101% ✓ 25.77 93% ✓ 28.99 104% ✓ 27.09 97% ✓
12 24.86 25.35 102% ✓ 22.85 92% ✓ 26.03 105% ✓ 24.40 98% ✓
13 22.4 22.56 101% ✓ 20.62 92% ✓ 23.32 104% ✓ 21.77 97% ✓
14 35.45 35.08 99% ✓ 30.82 87% ✓ 35.94 101% ✓ 33.53 95% ✓
15 32.52 32.67 100% ✓ 27.74 85% ✓ 33.41 103% ✓ 31.15 96% ✓
16 29.52 30.00 102% ✓ 25.43 86% ✓ 30.75 104% ✓ 28.94 98% ✓
17 26.99 26.87 100% ✓ 22.72 84% ✓ 28.27 105% ✓ 26.16 97% ✓
18 24.17 24.12 100% ✓ 20.24 84% ✓ 25.85 107% ✓ 22.69 94% ✓
19 35.01 35.29 101% ✓ 26.25 75% x 36.09 103% ✓ 33.03 94% ✓
20 32.19 33.43 104% ✓ 23.53 73% x 33.44 104% ✓ 31.35 97% ✓
21 29.15 29.16 100% ✓ 21.13 72% x 31.22 107% ✓ 29.08 100% ✓
22 26.07 24.69 95% ✓ 19.46 75% x 28.26 108% ✓ 24.14 93% ✓
23 23.35 21.53 92% ✓ 17.33 74% x 25.27 108% ✓ 19.78 85% ✓
24 17.75 14.98 84% ✓ 16.29 92% ✓ 16.72 94% ✓ 11.58 65% x
25 17.62 14.89 85% ✓ 16.51 94% ✓ 16.91 96% ✓ 11.88 67% x
26 16.59 13.53 82% ✓ 14.79 89% ✓ 15.53 94% ✓ 11.43 69% x
27 14.65 12.64 86% ✓ 13.49 92% ✓ 13.9 95% ✓ 10.36 71% x
28 13.8 11.38 82% ✓ 12.74 92% ✓ 13.05 95% ✓ 10.35 75% x
29 13.38 11.36 85% ✓ 13.21 99% ✓ 13.08 98% ✓ 10.39 78% x
30 36.62 34.25 94% ✓ 35.75 98% ✓ 36.46 100% ✓ 29.74 81% ✓
31 35.64 33.14 93% ✓ 34.49 97% ✓ 33.53 94% ✓ 28.91 81% ✓
32 34.2 31.59 92% ✓ 32.85 96% ✓ 32.22 94% ✓ 28.04 82% ✓
33 32.25 30.21 94% ✓ 31.03 96% ✓ 32.22 100% ✓ 26.71 83% ✓
34 30.81 28.68 93% ✓ 29.54 96% ✓ 30.6 99% ✓ 25.37 82% ✓
35 14.25 12.20 86% ✓ 14.00 98% ✓ 13.82 97% ✓ 11.36 80% ✓

Building 4
When compared to the Existing Situation, for the tested points in Building 4, the no. of points that are
in line with the recommended values as set out in the BRE Guidelines:
− Option 2a: 100% (35 out of 35 points)
− Option3: 83% (29 out of 35 points)
Compliant
Non Compliant
Massing Option 3
www.iesve.com

www.iesve.com
✓/✓
Both the Proposed Scheme annual and
winter APSH results are greater than 25%
and 5% respectively, or are greater than
0.8 times their former value or are less
than 4% overall annual loss with the
proposed development in place.
✓/X
The annual APSH results are greater
than 25% or are greater than 0.8 times
their former value with the proposed
development in place, however, the
winter results are below the guidelines.
X/✓
The annual APSH results are less than
the recommended values, however, the
winter APSH results are greater than 5%
or greater than 0.8 times their former
value with the proposed development in
place.
X/X
Both the annual and winter APSH results
are less than 25% and 5% respectively,
and less than 0.8 times their former
value or are greater than 4% overall
annual loss with the proposed
Ref:
Existing Situation Massing Option 1 Massing Option 2 Massing Option 2a Massing Option 3
Annual Winter Annual Winter
Proposed
APSH
as a % of
Existing
(Annual)
Proposed
APSH
as a % of
Existing
(Winter)
Proposed
APSH
as a % of
Existing
(Annual)
Proposed
APSH
as a % of
Existing
(Winter)
Proposed
APSH
as a % of
Existing
(Annual)
Proposed
APSH
as a % of
Existing
(Winter)
Proposed
APSH
as a % of
Existing
(Annual)
Proposed
APSH
as a % of
Existing
(Winter)
Comment
1 74.12 33.44 72.42 31.28 98% 94% ✓/✓ 72.57 31.63 98% 95% ✓/✓ 74.12 33.44 100% 100% ✓/✓ 65.09 26.20 88% 78% ✓/✓
2 72.2 31.23 68.94 27.92 95% 89% ✓/✓ 67.46 26.36 93% 84% ✓/✓ 72.32 31.23 100% 100% ✓/✓ 63.30 23.30 88% 75% ✓/✓
3 74.64 33.66 72.04 31.07 97% 92% ✓/✓ 70.77 29.80 95% 89% ✓/✓ 74.64 33.66 100% 100% ✓/✓ 64.90 26.03 87% 77% ✓/✓
4 72.1 31.78 68.78 28.46 95% 90% ✓/✓ 64.82 24.50 90% 77% ✓/✓ 72.11 31.78 100% 100% ✓/✓ 61.83 24.29 86% 76% ✓/✓
5 54.6 26.03 51.99 23.41 95% 90% ✓/✓ 50.56 20.78 93% 80% ✓/✓ 54.6 26.03 100% 100% ✓/✓ 44.73 18.64 82% 72% ✓/✓
6 59.86 27.07 57.48 24.69 96% 91% ✓/✓ 53.59 20.80 90% 77% ✓/✓ 59.86 27.07 100% 100% ✓/✓ 49.44 19.43 83% 72% ✓/✓
7 61.65 28.47 60.26 27.08 98% 95% ✓/✓ 59.75 26.57 97% 93% ✓/✓ 61.65 28.47 100% 100% ✓/✓ 51.21 19.96 83% 70% ✓/✓
8 59.82 27.73 58.27 26.18 97% 94% ✓/✓ 55.43 23.34 93% 84% ✓/✓ 59.82 27.73 100% 100% ✓/✓ 49.20 18.69 82% 67% ✓/✓
9 65.77 25.86 61.75 21.88 94% 85% ✓/✓ 58.80 18.93 89% 73% ✓/✓ 65.53 25.66 100% 99% ✓/✓ 57.23 19.45 87% 75% ✓/✓
10 60.44 21.87 56.62 18.07 94% 83% ✓/✓ 52.77 14.23 87% 65% ✓/✓ 60.33 21.79 100% 100% ✓/✓ 53.40 16.94 88% 77% ✓/✓
11 55.16 18.59 53.00 16.47 96% 89% ✓/✓ 49.50 13.41 90% 72% ✓/✓ 55.89 19.36 101% 104% ✓/✓ 50.64 16.19 92% 87% ✓/✓
12 48.55 15.34 47.77 14.59 98% 95% ✓/✓ 44.24 12.42 91% 81% ✓/✓ 50.74 17.56 105% 114% ✓/✓ 46.07 14.98 95% 98% ✓/✓
13 42.82 12.54 43.20 12.93 101% 103% ✓/✓ 39.12 11.36 91% 91% ✓/✓ 46.27 16.01 108% 128% ✓/✓ 40.22 12.04 94% 96% ✓/✓
14 68.39 28.66 65.33 25.63 96% 89% ✓/✓ 57.61 17.92 84% 63% ✓/✓ 68.46 28.76 100% 100% ✓/✓ 58.80 21.65 86% 76% ✓/✓
15 62.03 24.38 59.99 22.36 97% 92% ✓/✓ 52.14 15.70 84% 64% ✓/✓ 62.98 25.35 102% 104% ✓/✓ 54.37 19.93 88% 82% ✓/✓
16 57.44 21.84 54.55 16.97 95% 77% ✓/✓ 47.74 14.16 83% 65% ✓/✓ 57.86 22.27 101% 102% ✓/✓ 51.13 19.02 89% 87% ✓/✓
17 51.5 17.98 48.89 15.40 95% 86% ✓/✓ 43.19 13.03 84% 72% ✓/✓ 52.28 18.79 102% 105% ✓/✓ 44.71 14.69 87% 82% ✓/✓
18 44.6 13.45 43.52 12.39 98% 92% ✓/✓ 38.74 11.68 87% 87% ✓/✓ 47.46 16.32 106% 121% ✓/✓ 38.22 10.56 86% 79% ✓/✓
19 67 27.61 64.95 25.57 97% 93% ✓/✓ 51.75 14.71 77% 53% ✓/✓ 69.26 29.88 103% 108% ✓/✓ 57.68 21.81 86% 79% ✓/✓
20 62.03 23.9 61.67 23.54 99% 98% ✓/✓ 47.21 13.38 76% 56% ✓/✓ 64.03 25.9 103% 108% ✓/✓ 56.36 21.73 91% 91% ✓/✓
21 55.39 19.64 51.40 15.66 93% 80% ✓/✓ 39.64 10.53 72% 54% ✓/✓ 56.47 20.73 102% 106% ✓/✓ 50.40 18.69 91% 95% ✓/✓
22 46.5 12.95 43.36 9.95 93% 77% ✓/✓ 34.37 8.38 74% 65% ✓/✓ 48.59 15 104% 116% ✓/✓ 38.46 9.78 83% 76% ✓/✓
23 42.28 11.32 37.94 7.78 90% 69% ✓/✓ 30.40 8.35 72% 74% ✓/✓ 42.59 11.61 101% 103% ✓/✓ 30.93 5.93 73% 52% ✓/✓
24 24.09 13.38 19.41 8.70 81% 65% ✓/✓ 23.17 12.46 96% 93% ✓/✓ 24.09 13.38 100% 100% ✓/✓ 15.53 5.90 64% 44% x/✓
25 24.49 13.06 18.87 7.44 77% 57% x/x 22.02 10.59 90% 81% ✓/✓ 22.69 11.25 93% 86% ✓/✓ 15.87 5.65 65% 43% x/✓
26 22.56 11.13 17.03 5.60 75% 50% x/x 19.76 8.32 88% 75% ✓/✓ 19.96 8.53 88% 77% ✓/✓ 14.26 4.04 63% 36% x/x
27 18.71 7.6 14.80 3.70 79% 49% x/x 17.07 5.97 91% 79% ✓/✓ 18.33 7.23 98% 95% ✓/✓ 13.10 3.21 70% 42% x/x
28 16.28 5.29 13.03 2.04 80% 39% x/x 15.48 4.49 95% 85% ✓/✓ 16.53 5.54 102% 105% ✓/✓ 11.98 2.20 74% 42% x/x
29 16.4 3.8 14.48 1.88 88% 49% x/x 15.98 3.39 97% 89% ✓/✓ 16.62 4.11 101% 108% ✓/✓ 13.00 1.57 79% 41% x/x
30 57.86 25.75 53.96 21.87 93% 85% ✓/✓ 52.40 20.31 91% 79% ✓/✓ 58.42 26.39 101% 102% ✓/✓ 45.96 17.33 79% 67% ✓/✓
31 55.64 23.57 51.99 20.05 93% 85% ✓/✓ 50.63 18.69 91% 79% ✓/✓ 56.42 24.47 101% 104% ✓/✓ 45.33 16.84 81% 71% ✓/✓
32 52.04 21.5 47.62 15.83 92% 74% ✓/✓ 47.06 15.97 90% 74% ✓/✓ 51.07 19.79 98% 92% ✓/✓ 44.27 15.94 85% 74% ✓/✓
33 48.21 18.15 41.03 11.17 85% 62% ✓/✓ 41.41 12.47 86% 69% ✓/✓ 44.19 15.22 92% 84% ✓/✓ 39.28 13.57 81% 75% ✓/✓
34 41.27 11.65 37.49 8.03 91% 69% ✓/✓ 38.00 10.22 92% 88% ✓/✓ 41.39 12.23 100% 105% ✓/✓ 33.75 8.38 82% 72% ✓/✓
35 17.91 6.36 15.11 3.03 84% 48% ✓/ x 18.12 6.29 101% 99% ✓/✓ 17.26 5.19 96% 82% ✓/✓ 14.23 2.99 79% 47% ✓/ x

Building 4
When compared to the Existing Situation, for Building 4, of the 35 no. tested points, the no. of points that
meet the BRE recommendation :
− Option 1: 29 no. (83%)
− Option 2: 35 no. (100%)
These results highlight that Options 2 and 2a have the least impact to the sunlight received on Building 4.
Compliant
Non Compliant
Massing Option 3
− Option 2a: 35 no. (100%)
− Option 3: 28 no. (80%)
www.iesve.com

Impact on Apartment Design
www.iesve.com
— Room Depth/Layout
— % Glazing
— Balcony Design
— Depth/Area
— Location
— Finishes
— Internal
— External

1 2
www.iesve.com

2
2
1
1
Option 1
− LKD recessed under balcony
Option 2
− Bedroom recessed under balcony
− Storage & WC placed at back of the
apartment
www.iesve.com

Option 1
− Full width balcony
Option 2
− Reduced balcony area to minimum
requirements
www.iesve.com
1 2

www.iesve.com
— Interoperability:
— Revit, SketchUp, Rhino
— gbXML, Pollination (.GEM)
— Daylight & Sunlight Studies:
— Why & When – Standards & Guidance
— IESVE Sunlight & Daylight
— Case Study: Multi-Residential Apartment Block
What we covered?

IES Consulting
Services
www.iesve.com
BIM Masterplanning Design Building Regs CFD Studies
LEED BREEAM Mentoring Bid Support
In Use /
Operation

IESVE Training
www.iesve.com/training/online-training
www.iesve.com

Thank you
Any Questions?
niall.gibson@iesve.com
douglas.bell@iesve.com
consulting@iesve.com
sales@iesve.com

IESVE for Early Stage Design and Planning

Recommended

Recommended

More Related Content

What's hot

What's hot (13)

Similar to IESVE for Early Stage Design and Planning

Similar to IESVE for Early Stage Design and Planning (20)

More from IES VE

More from IES VE (18)

Recently uploaded

Recently uploaded (20)

IESVE for Early Stage Design and Planning