Delivering Sustainable Buildings

Protecting People, Property and the Planet
Delivering Sustainable Buildings: Savings and
Payback – Breakfast Briefing
Yetunde Abdul, Principal Consultant, BRE
Part of the BRE Trust
BREEAM UK New Construction scheme –
New BRE Trust capital and life cycle cost study
–  BREEAM UK New Construction 2011 scheme
–  Covers costs associated with:
§  ‘Pass’ to ‘Excellent’ ratings
§  Energy and water capital and life cycle costs,
payback and utility savings
–  Key contributors
§  BRE Global – project managers and authors
§  BRE Trust and Cabinet Office – funding bodies
§  Sweett Group – provided costing information,
conducted cost studies and produced cost
results
Why conduct this research?
–  Lack of cost data relating to post 2008 UK
BREEAM schemes
–  Builds on previously BRE Trust research e.g.
Putting a Price on Sustainability
–  Key BREEAM stakeholders requesting more
recent evidence of costs associated with
sustainable buildings
–  Inform BREEAM scheme development - BREEAM
UK New Construction 2011 to the 2014 version
Methodology: an overview
–  Three case study buildings:
§  an air-conditioned office
§  a secondary school
§  a community healthcare centre
–  Base case building established (meets statutory
requirements)
–  Range of sustainability measures identified and applied
–  Represented progressively higher levels of BREEAM
ratings
–  Factors taken into consideration in determining costs
include:
§  Location (poor, typical, good)
§  Range of specification choices/design decisions
Key results
Capital costs
–  Achieving lower BREEAM ratings incurs little or no
additional cost
–  Targeting higher BREEAM ratings incurs some
additional cost but this is typical less than 2 %
Lifecycle costs
–  The study of operational costs shows that this can
be paid back within 2 - 5 years through utility cost
savings
Office case study
Office case study building
General project information
–  Speculative building, consisting of five storeys
–  Gross floor area = 13,800 m2
–  Net office space area = 11,150m2
–  Base build capital cost = £27.6m (£2000/m2)
Features
–  Steel-frame construction, concrete ground-floor slab and upper floors, glazed
curtain walling, double-glazed windows
–  Four-pipe fan-coil air conditioning served by gas boilers and water cooled chillers,
efficient lighting system, electric instantaneous hot water to all toilet and kitchen
areas
–  High quality space expected to attract tenants with an interest in the green agenda
Increase in capital costs for each BREEAM rating
Location
BREEAM score
and rating for
the case study
building
% Increase in capital cost relative to BREEAM
rating of Pass, Good / Very Good / Excellent
Pass
Good
Typical
Poor
46.7 (Good)
0
Good
0
Very Good
Excellent
0.13
0.87
Further information available in the report for these location types
Energy consumption life cycle costs and savings:
Contribution to BREEAM Excellent rating – Option 2
Energy
Solution
Option 1 Passive chilled
beams
Option 2 Active chilled
beams
Energy
price
scenario
Capital
Costs
(£)
Central
DECC
energy
prices
High
DECC
energy
prices
Lifecycle
savings
(£)
479,352
Payback
period
(years)
Annual
electricity
Savings –
(kWh)
Annual
CO2
savings –
(kgCO2)
-1450
153,870
79,264
8
167,250
503,313
Annual
Gas
Savings
(kWh)
8
Lifecycle savings equate to the net electricity and gas bill savings less any additional maintenance or
replacement costs over 25 years.
Water consumption life cycle costs and savings
BREEAM
credits
Capital
Cost (over
baseline)
(£)
Payback
period
Payback
period
Water saving
per annum
(m3/years)
(Higher
tariff)
(Lower
tariff)
1st
0
0
0
2847
2nd
1220
1
1
3566
3rd
8570
1
1
5014
4th
14,150
1
2
6017
5th
74,150
3
9
6425
Lower tariff (Ofwat figures) assumes a tariff of £1.692/m3 (Thames Water) plus a 0.5% tariff increase per annum.
Higher tariff (Ofwat figures) assumes a tariff of £4.351/m3 (South West Water) plus a 0.5% tariff increase per annum.
Growing evidence of sustainability benefits
2013
2012
World Green Building Council
(WorldGBC) report
BSRIA Report: The Value of BREEAM
report
2012
RICS report :Supply, Demand and the
Value of Green
2012
Town & Country Planning Association’s
publication ‘Good Practice Guide –
Sustainable Design & Construction
Investment costs not
as high as perceived
Potentially significant
life cycle cost savings
Increased value,
suggested higher staff
productivity levels
Decreasing costs
Trend towards a reduction in the increased capital
costs associated with BREEAM ratings: Offices
BREEAM
rating
BREEAM version used in capital cost studies
2004*
2008†
2011‡
Pass
0.0
–
0.0
Good
0.0
–
0.05 – 0.15
Very good
0.2
0.17
0.13 – 0.34
Excellent
0.1 – 5.7
0.77
0.87 – 1.71
* Putting a Price on Sustainability (2004)
† Steel Construction info, Target Zero (2008)
‡ Delivering Savings and Payback (2014)
This version of BREEAM does not necessarily denote the year of building construction or year of BREEAM assessment
Protecting People, Property and the Planet
Thank you
www.breeam.com/value
breeam@bre.co.uk