delivering sustainable buildings: savings and payback ......delivering sustainable buildings:...
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![Page 1: Delivering Sustainable Buildings: Savings and Payback ......Delivering Sustainable Buildings: Savings and Payback – Breakfast Briefing Yetunde Abdul, Principal Consultant, BRE –](https://reader033.vdocuments.site/reader033/viewer/2022052800/5f0f35997e708231d4430747/html5/thumbnails/1.jpg)
Part of the BRE Trust
Protecting People, Property and the Planet
Delivering Sustainable Buildings: Savings and Payback – Breakfast Briefing Yetunde Abdul, Principal Consultant, BRE
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– 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
BREEAM UK New Construction scheme – New BRE Trust capital and life cycle cost study
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– 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
Why conduct this research?
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– 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
Methodology: an overview
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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
Key results
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Office case study
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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
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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 Very Good Excellent
Good 46.7 (Good) 0 0 0.13 0.87
Typical Further information available in the report for these location types Poor
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Energy consumption life cycle costs and savings: Contribution to BREEAM Excellent rating – Option 2
Energy Solution
Energy price scenario
Capital Costs (£)
Lifecycle savings (£)
Payback period (years)
Annual Gas Savings (kWh)
Annual electricity Savings – (kWh)
Annual CO2 savings – (kgCO2)
Option 1 - Passive chilled beams Option 2 - Active chilled beams
Central DECC energy prices
167,250
479,352 8
-1450 153,870 79,264 High DECC energy prices
503,313 8
Lifecycle savings equate to the net electricity and gas bill savings less any additional maintenance or replacement costs over 25 years.
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Water consumption life cycle costs and savings BREEAM credits
Capital Cost (over baseline) (£)
Payback period (Higher tariff)
Payback period (Lower tariff)
Water saving per annum (m3/years)
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.
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Growing evidence of sustainability benefits
Investment costs not as high as perceived
2013 World Green Building Council (WorldGBC) report
2012 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
Potentially significant life cycle cost savings
Increased value, suggested higher staff productivity levels
Decreasing costs
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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