Delivering Sustainable Buildings: Savings and Payback – Breakfast Briefing Yetunde Abdul, Principal Consultant, BRE
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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 % Increase in capital cost relative to BREEAM and rating for rating of Pass, Good / Very Good / Excellent the case study building 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 Energy consumption life cycle costs and savings: Contribution to BREEAM Excellent rating – Option 2 Energy Energy Capital Lifecycle Payback Annual Annual Annual Solution price Costs savings period Gas electricity CO2 scenario (£) (£) (years) Savings Savings – savings – (kWh) (kWh) (kgCO2) Central Option 1 - DECC 8 479,352 Passive chilled energy beams prices 167,250 High -1450 153,870 79,264 DECC Option 2 - energy Active chilled 503,313 8 prices beams 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 Capital Payback Payback Water saving credits Cost (over period period per annum baseline) (m3/years) (£) (Higher (Lower tariff) 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 World Green Building Council Investment costs not (WorldGBC) report as high as perceived Potentially significant 2012 BSRIA Report: The Value of BREEAM life cycle cost savings report Increased value, 2012 RICS report :Supply, Demand and the suggested higher staff Value of Green productivity levels 2012 Town & Country Planning Association’s Decreasing costs publication ‘Good Practice Guide – Sustainable Design & Construction Trend towards a reduction in the increased capital costs associated with BREEAM ratings: Offices BREEAM BREEAM version used in capital cost studies rating 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 [email protected] .