Delivering Sustainable Buildings: Savings and Payback Breakfast Briefing

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Isabella Whitehead
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1 Protecting People, Property and the Planet Delivering Sustainable Buildings: Savings and Payback Breakfast Briefing Yetunde Abdul, Principal Consultant, BRE Part of the BRE Trust

2 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

3 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

4 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

5 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

6 Office case study

7 Office case study building General project information Speculative building, consisting of five storeys Gross floor area = 13,800 m 2 Net office space area = 11,150m 2 Base build capital cost = 27.6m ( 2000/m 2 ) 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

8 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) Typical Poor Further information available in the report for these location types

9 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 CO 2 savings (kgco 2 ) Option 1 - Passive chilled beams Option 2 - Active chilled beams Central DECC energy prices High DECC energy prices 167, , , ,870 79,264 Lifecycle savings equate to the net electricity and gas bill savings less any additional maintenance or replacement costs over 25 years.

10 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 (m 3 /years) 1 st nd rd th 14, th 74, Lower tariff (Ofwat figures) assumes a tariff of 1.692/m 3 (Thames Water) plus a 0.5% tariff increase per annum. Higher tariff (Ofwat figures) assumes a tariff of 4.351/m 3 (South West Water) plus a 0.5% tariff increase per annum.

11 Growing evidence of sustainability benefits 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 Investment costs not as high as perceived Potentially significant life cycle cost savings Increased value, suggested higher staff productivity levels 2012 Town & Country Planning Association s publication Good Practice Guide Sustainable Design & Construction Decreasing costs

12 Trend towards a reduction in the increased capital costs associated with BREEAM ratings: Offices BREEAM rating BREEAM version used in capital cost studies 2004* Pass Good Very good Excellent * 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

13 Protecting People, Property and the Planet Thank you

main heating: pre1998 ducted warm air system main heating fuel: mains gas main heating SAP efficiency: 70.0% main heating controls: programmer

main heating: pre1998 ducted warm air system main heating fuel: mains gas main heating SAP efficiency: 70.0% main heating controls: programmer Archetype: 3250330 Archetype Description: 1965-1975, semi / end terraced dwelling, timber frame walls, oil / gas / electric warm air heating, E This archetype represents 823 dwellings, which accounts for