Modelling properties and advising occupiers for the Green Deal – In practice 06/10/11 Chris Newman Parity Projects
Two angles of attack Top Down Stock Assessment Housing Providers Informs strategy CROHM Bottom Up Individual property assessment Private residences Directly informs choices HEMP
Individual Homes Home Energy Masterplan Housing stock CROHM Parity information and analysis
Pay As You Save Trial - Sutton Carried out the analysis for homeowners on behalf of B&Q working with Sutton Council Interest free and 40% discount ~ 100 homes assessed with 67 going onto have work carried out Gave B&Q consulting advice on process and measures throughout – e.g. extra options, PV and windows
The process Survey arrangement (B&Q) Data collection (Parity Projects) with B&Q/ROK person present Client debrief (Parity Projects) – what we will evaluate/exclude Data Analysis (Parity Projects) – offsite Report delivery (Parity Projects)
Home Energy Masterplan - whats the difference Advice not benchmarking Occupational/behavioural inputs – actual use Ability to calibrate Recommend initiatives as: Individual measures Packages of measures Present their benefit alongside their indicative cost Technical – BREDEM based with bespoke modules for DHW, lights appliances etc. Also a large supporting database of materials, costs, products, appliances etc
Home Energy Masterplan - whats the difference
What we learnt Every home really is different
Every home is different a cliché but a major problem when financial advice is being given
What we learnt Every home really is different Customers like having an independent advisor 3 people bumbling around a house gets a bit crowded Benchmarking tools (RdSAP and SAP) are not suitable for giving detailed recommendations and in particular financial advice Getting everything done in one visit would be hard and probably not desirable
What we learnt Do not be fooled into thinking home assessments are trivial – under every stone... Primary modelling: Under heated and non-standard heated dwellings Radical differences in DHW and electricity loads Analysis: Order of attack Amending the base case – boilers Pricing No-one wants their whole house renovated...front wall only... Golden Rule [s] – myriad issues: prices, financing rates, sequencing, part subsidy
Top Down – Stock Assessment Corporate Priorities Existing Housing Data Draft stock assessment Housing Retrofit plan Detailed Plans: Unit and/or Archetype level assessments Budget, Plans Maintenance Consultation, corporate priorities Data improvement and strategy
EPC CP12s Street survey Archetype analysis Cloning Carbon Assessment Stage 1: data
More cost effective Greater total potential £ / tCO2 / year Total improvement possible (CO2 / year) Stage 2: Stock Assessment
CO 2 Tenant Fuel Bills SAP Stage 2: Stock Assessment
Paritys key takeaways Dont try and shortcut the assessment of a property – assessments based on averages or benchmarking tool just arent worth it Housing providers should get their data in order and understand their strategy for their stock – it can be relatively inexpensive for the valuable guidance it provides Chris Newman