SAP Standard Assessment Procedure

What are SAP Energy Assessments?

From 6 April 2008, it is necessary to provide the prospective owner a full EPC and recommendation Report for new homes and dwellings. The EPC can only be produced by an Accredited On Construction Energy Assessor (SAP Assessor). Energy consultants produce SAP calculations to demonstrate that new build homes and dwellings meet Target Emission Rates as part of Building Regulations. On Construction Energy Assessors produce the EPC, they must be qualified and be a member of an accreditation scheme.

These accreditation schemes offer protection to house builders and potential homeowners by ensuring Energy Assessors have the required skills to conduct energy assessments and calculations. Our consultants are fully qualified and accredited to provide EPCs.

To provide a New build EPC, the On Construction Energy Assessor uses an approved version of the SAP software to calculate the energy rating of the new home or dwelling The Energy Performance Certificate is registered and stored in a national archive, each EPC has a unique reference number.

On Construction Energy Assessors are not normally required to visit the property to produce the EPC since the SAP calculations can be made from scale plans and the design specifications supplied by the client. The resultant EPC will be the result of the As Built calculations which is an extension of the SAP calculation needed for Building Control purposes.

Building Control cannot issue a completion certificate for the property without an EPC. In such cases the sale of the property cannot proceed without an EPC being issued. Similarly a completion certificate cannot be issued if a property is converted into fewer or more units and there are changes to the heating system and, or, hot water provision or air conditioning/ ventilation systems. As from 6 April 2008 homes will require an EPC on construction or such conversion.

EPCC provide the following:

SAP Energy Assessments - For New Build EPC

Please refer to Energy Assessment for further information and prices for our services including contact information.

EPC Commercial
We can provide energy ratings and calculations, and the issue of EPC (Energy Performance Certificates) for the following buildings:

SAP – Standard Assessment Procedure for New Build Properties. We can produce SAP and Carbon Index ratings, Target and Elemental u-value calculations. PEA - Predictive Energy Assessment for property marketing purposes. This is a mandatory requirement for new build properties to display a PEA SAP rating prior to sale. PEA for off-plan and partial construction New Build Homes. ATT - Air Tightness Testing of New Build dwellings. SBEM - Energy calculations for commercial buildings and production of Commercial EPC. ATT - Air Tightness Testing of Commercial Buildings EPC – New Build Domestic Energy Performance Certificate DEC - Display Energy Certificates for Public Buildings

Specialist Consultants and Contractors for:
SAP Standard Assessment Procedure EPC Energy Assessments Bedfordshire: Ampthill, Arlesey, Bedford, Biggleswade, Dunstable, Harrold, Henlow, Leighton Buzzard, Luton, Old Warden, Sandy, Shefford, Silsoe, Toddington, Woburn.

SAP Standard Assessment Procedure EPC Energy Assessments Berkshire: Ascot, Bracknell, Bray, Cookham, Crowthorne, Datchet, Eton, Hungerford, Lambourn, Maidenhead, Newbury, Old Windsor, Pangbourne, Reading, Sandhurst, Slough, Sunningdale, Thatcham, Waltham St Lawrence, Windsor, Wokingham.

SAP Standard Assessment Procedure EPC Energy Assessments Buckinghamshire: Amersham, Aylesbury, Beaconsfield, Bourne End, Buckingham, Chalfont St Giles, Chesham, Gerrards Cross, Great Missenden, Haddenham, High Wycombe, Iver, Marlow, Milton Keynes, Newport Pagnell, Olney, Princes Risborough, West Wycombe.

SAP Standard Assessment Procedure EPC Energy Assessments Cambridgeshire: Bourn, Cambridge, Chatteris, Duxford, Ely, Fordham, Fulbourne, Godmanchester, Huntingdon, Linton, Littleport, March, Peterborough, Soham, St Ives, St Neots, Stretham, Sutton, Wansford, Waterbeach, Willingham, Wimpole, Wisbech.

SAP Standard Assessment Procedure EPC Energy Assessments Cheshire: Alderley Edge Altrincham Cheadle Chester Congleton Crewe Dukinfield Frodsham Hyde Knutsford Lymm Macclesfield Malpas Middlewich Nantwich Northwich Runcorn Sale Sandbach Stalybridge Stockport Tarporley Warrington Widnes Wilmslow Winsford.

SAP Standard Assessment Procedure EPC Energy Assessments Cornwall: Bodmin, Bolventor, Boscastle, Bude, Callington, Calstock, Camborne, Camelford, Cawsand, Delabole, Dobwalls, Falmouth, Fowey, Gunnislake, Hayle, Helston, Kilkhampton, Lands End, Lanreath, Launceston, Liskeard, Lizard, Looe, Lostwithiel, Marazion, Mevagissey, Morwenstow, Mousehole, Mullion, Newlyn, Newquay, Padstow, Par, Penryn, Penzance, Perranporth, Polperro, Polzeath, Port Isaac, Porthcurno, Porthleven, Portreath, Probus, Redruth, Saltash, St Agnes, St Austell, St Cleer, St Columb, St Ives, St Just, St Keverne, St Mawes, Tintagel, Torpoint, Truro, Wadebridge, Widemouth Bay.

SAP Standard Assessment Procedure EPC Energy Assessments Cumbria: Alston, Ambleside, Appleby-in-Westmorland, Barrow-in-Furness, Bowness-on-Windermere, Carlisle, Cockermouth, Coniston, Kendal, Keswick, Kirkby, Stephen, Maryport, Penrith, Ravenglass, Silloth, Whitehaven, Wigton, Windermere, Workington.

SAP Standard Assessment Procedure EPC Energy Assessments Derbyshire: Alfreton Ashbourne Bakewell Belper Buxton Chesterfield Derby Dronfield Glossop Heanor High Peak Hope Valley Ilkeston Matlock Melbourne Ripley Swadlincote Wirksworth.

SAP Standard Assessment Procedure EPC Energy Assessments Devon: Axminster Barnstaple Beaworthy Bideford Braunton Brixham Buckfastleigh Budleigh Salterton Chulmleigh Colyton Crediton Cullompton Dartmouth Dawlish Exeter Exmouth Holsworthy Honiton Ilfracombe Ivybridge Kingsbridge Lifton Lynmouth Lynton Newton Abbot North Tawton Okehampton Ottery St Mary Paignton Plymouth Salcombe Seaton Sidmouth South Brent South Molton Tavistock Teignmouth Tiverton Torquay Torrington Totnes Umberleigh Winkleigh Woolacombe Yelverton.

SAP Standard Assessment Procedure EPC Energy Assessments Dorset: Abbotsbury, Beaminster, Bere Regis, Blandford Forum, Bournemouth, Bridport, Broadstone, Christchurch, Corfe Castle, Cranborne, Dorchester, Ferndown, Gillingham, Lyme Regis, Milton Abbas, Poole, Portland, Shaftesbury, Sherborne, Sturminster Newton, Swanage, Verwood, Wareham, West Lulworth, Weymouth, Wimborne Minster.

SAP Standard Assessment Procedure EPC Energy Assessments Durham: Barnard Castle, Bishop Auckland, Chester-le-Street, Consett, Crook, Darlington, Easington, Ferryhill, Hartlepool, Middleton-in-Teesdale, Peterlee, Seaham, Shildon, Stanley and Stockton-on-Tees.

SAP Standard Assessment Procedure EPC Energy Assessments Essex: Barking Basildon Benfleet Billericay Braintree Brentwood Buckhurst Hill Burnham-On-Crouch Canvey Island Chelmsford Chigwell Clacton-On-Sea Colchester Dagenham Dunmow Epping Frinton-On-Sea Grays Halstead Harlow Harwich Hockley Hornchurch Ilford Ingatestone Leigh-On-Sea Loughton Maldon Manningtree Ongar Purfleet Rainham Rayleigh Rochford Romford Saffron Walden South Ockendon Southend-On-Sea Southminster Stanford-Le-Hope Stansted Tilbury Upminster Waltham Abbey Walton On The Naze Westcliff-On-Sea Wickford Witham Woodford Green.

SAP Standard Assessment Procedure EPC Energy Assessments Glamorgan: Mid Glamorgan Aberdare, Bargoed, Bridgend, Caerphilly, Ferndale, Hengoed, Maesteg, Merthyr Tydfil, Mountain Ash, Pentre, Pontyclun, Pontypridd, Porthcawl, Porth, Tonypandy, Treharris, Treorchy. South Glamorgan Barry, Cardiff, Cowbridge, Dinas Powys, Llantwit Major, Penarth. West Glamorgan Neath, Swansea, Port Talbot.

SAP Standard Assessment Procedure EPC Energy Assessments Gloucestershire: Berkeley, Blakeney, Cheltenham, Chipping Campden, Cinderford, Cirencester, Coleford, Drybrook, Dursley, Dymock, Fairford, Gloucester, Lechlade, Longhope, Lydbrook, Lydney, Mitcheldean, Moreton-In-Marsh, Newent, Newnham, Ruardean, Stonehouse, Stroud, Tetbury, Tewkesbury, Westbury-On-Severn, Wotton-Under-Edge.

SAP Standard Assessment Procedure EPC Energy Assessments Hampshire: Aldershot Alresford Alton Andover Basingstoke Bordon Brockenhurst Eastleigh Emsworth Fareham Farnborough Fleet Fordingbridge Gosport Havant Hayling Island Hook Lee-On-The-Solent Liphook Liss Lymington Lyndhurst New Milton Petersfield Portsmouth Ringwood Rowlands Castle Southampton Southsea Stockbridge Tadley Tidworth Waterlooville Whitchurch Winchester, Yateley.

SAP Standard Assessment Procedure EPC Energy Assessments Herefordshire: Bromyard, Hay-on-Wye, Hereford, Kington, Ledbury, Leominster, Pembridge, Ross-On-Wye, Symonds Yat, Weobley.

SAP Standard Assessment Procedure EPC Energy Assessments Hertfordshire: Abbots Langley, Baldock, Barnet, Berkhamsted, Bishops Stortford, Borehamwood, Broxbourne, Buntingford, Bushey, Cheshunt, Harpenden, Hatfield, Hemel Hempstead, Hertford, Hitchin, Hoddesdon, Kings Langley, Knebworth, Letchworth Garden City, Much Hadham, Potters Bar, Radlett, Rickmansworth, Royston, Sawbridgeworth, St Albans, Stevenage, Tring, Waltham Cross, Ware, Watford, Welwyn Garden City.

SAP Standard Assessment Procedure EPC Energy Assessments Humberside: Beverley, Bridlington,  Cottingham, Driffield, Goole, Grimsby, Hull, Hornsea, Scarborough, Stockton, Teesside, Guisborough, Whitby, Yarm.

SAP Standard Assessment Procedure EPC Energy Assessments Kent: Ashford, Aylesford, Beckenham, Belvedere, Bexley, Biddenden, Birchington, Broadstairs, Canterbury, Chatham, Chislehurst, Cobham, Dartford, Deal, Dover, Dungeness, Eynsford, Faversham, Folkestone, Gillingham, Gravesend, Herne Bay, Hythe, Lamberhurst, Maidstone, Margate, New Romney, Orpington, Penshurst, Ramsgate, Rochester, Romsey, Sandwich, Sevenoaks, Sheerness, Sidcup, Sittingbourne, Tenterden, Tonbridge, Tunbridge Wells, Welling, West Malling, West Wickham, Westerham, Whitstable.

SAP Standard Assessment Procedure EPC Energy Assessments Lancashire: Accrington Ashton-Under-Lyne Bacup Barnoldswick Blackburn Blackpool Bolton Burnley Bury Carnforth Chorley Clitheroe Colne Darwen Fleetwood Heywood Lancaster Leigh Leyland Littleborough Lytham St Annes Manchester Morecambe Nelson Oldham Ormskirk Poulton-Le-Fylde Preston Rochdale Rossendale Salford Skelmersdale Thornton-Cleveleys Todmorden Wigan.

SAP Standard Assessment Procedure EPC Energy Assessments Leicestershire: Ashby-De-La-Zouch, Coalville, Hinckley, Ibstock, Kegworth, Leicester, Loughborough, Lutterworth, Market Bosworth, Market Harborough, Markfield, Melton Mowbray, Twycross, Wigston.

SAP Standard Assessment Procedure EPC Energy Assessments Lincolnshire: Alford, Boston, Bourne, Cleethorpes, Gainsborough, Grantham, Grimsby, Horncastle, Lincoln, Louth, Mablethorpe, Market Rasen, Scunthorpe, Skegness, Sleaford, Spalding, Spilsby, Stamford, Woodhall Spa South and North Lincolnshire.

SAP Standard Assessment Procedure EPC Energy Assessments London: Acton, Anerley, Balham, Barnes, Battersea, Belgravia, Bermondsey, Bethnal Green, Blackheath, Bloomsbury, Borough, Bow, Brixton, Brockley, Camberwell, Camden, Canning Town, Catford, Central London, Charlton, Chelsea, Chingford, Chiswick, City of London, Clapham, Clapton, Clerkenwell, Covent Garden, Cricklewood, Deptford, Dulwich, Ealing, Earls Court, East Dulwich, East Finchley, East Ham, East London, Eltham, Finchley, Finsbury Park, Forest Gate, Forest Hill, Fulham, Golders Green, Greenwich, Hackney, Hammersmith, Hampstead, Hanwell, Harringay, Hendon, Herne Hill, Highbury, Highgate, Holloway, Homerton, Hornsey, Islington, Kensington, Kentish Town, Kilburn, Kingsbury, Lambeth, Lee, Lewisham, Leyton, Leytonstone, Lower Edmonton, Maida Vale, Manor Park, Marylebone, Mayfair, Mill Hill, Mortlake, Muswell Hill, New Cross, New Southgate, North Finchley, North Kensington, North London, Norwood, Notting Hill, Paddington, Palmers Green, Peckham, Pimlico, Plaistow, Poplar, Putney, Rotherhithe, Shadwell, Shepherd's Bush, Shoreditch, Soho, South Kensington, South Lambeth, South London, South Norwood, South Tottenham, South Woodford, Southgate, Spitalfields, St John's Wood, Stepney, Stockwell, Stoke Newington, Stratford, Streatham, Sydenham, Thamesmead, Tooting, Tottenham, Upper Edmonton, Upper Holloway, Victoria, Walthamstow, Walworth, Wandsworth, Wapping, Waterloo, West Brompton, West Ealing, West Kensington, West London, West Norwood, West Wimbledon, Westminster, Whetstone, Whitechapel, Willesden, Wimbledon, Winchmore Hill, Wood Green, Woolwich.

SAP Standard Assessment Procedure EPC Energy Assessments Manchester: Altrincham Ashton-in-Makerfield Ashton-under-Lyne Atherton Bolton Bury Cadishead Chadderton Cheadle Denton Droylsden Dukinfield Eccles Failsworth Farnworth Golborne Heywood Hindley Horwich Hyde Ince-in-Makerfield Irlam Kearsley Leigh Littleborough Mossley Oldham Pendlebury Prestwich Radcliffe Ramsbottom Rochdale Royton Sale Salford Stalybridge Stockport Stretford Swinton Trafford Park Tyldesley Urmston Walkden Westhoughton Whitefield Wigan Worsley.

SAP Standard Assessment Procedure EPC Energy Assessments Merseyside: Aigburth, Aintree, Allerton, Anfield, Bebington, Birkenhead, Bootle, Childwall, Crosby, Dingle, Ellesmere Port, Everton, Fazakerly, Formby, Garston, Grassendale, Halewood, Hunts Cross, Huyton, Kirkdale, Kirby, Knotty Ash, Litherland, Liverpool, Maghull, Neston, Newton Le Willows, Port Sunlight, Prenton, Prescot, Roby, Seaforth, Sefton, Southport, Speke, St Helens, Wallasey, Waterloo, West Derby, West Kirby, Wirral.

SAP Standard Assessment Procedure EPC Energy Assessments Norfolk: Acle, Attleborough, Aylsham, Blakeney, Brancaster, Caister-on-Sea, Castle Rising, Cromer, Dereham, Diss, Downham Market, Fakenham, Great Yarmouth, Happisburgh, Hemsby, Holt, Horsey, Hunstanton, Kings Lynn, Little Walsingham, Melton Constable, North Walsham, Norwich, Sandringham, Sheringham, Swaffham, Thetford, Walsingham, Wells-next-the-Sea, Wroxham, Wymondham.

SAP Standard Assessment Procedure EPC Energy Assessments North Wales: Buckley, Caerwys, Chirk, Connah's Quay, Corwen, Denbigh, Flint, Holywell, Llangollen, Mold, Prestatyn, Queensferry, Rhyl, Ruthin, Towyn & Kinmel Bay, Shotton, St Asaph, Colwyn Bay, Llandudno, Acrefair-Coedpoeth, Erddig-Minera, New Broughton-Talwrn Green, Amlwch, Beaumaris, Benllech, Holyhead, Llanfairpwll & Menai Bridge, Llangefni, Newborough, Anglesey, Conwy, Gwynedd, Caernarfon, Bangor, Dolgellau, Aberdyfi, Beddgelert, Harlech, Porthmadog, Tywyn, Corris, Bala, Barmouth, Bethesda, Blaenau Ffestiniog, Abergele, Betws-y-Coed, Penmaenmawr, Llanrwst, Llanfairfechan.

SAP Standard Assessment Procedure EPC Energy Assessments North Yorkshire: Bedale Catterick Garrison Filey Harrogate Hawes Knaresborough Leyburn Malton Northallerton Pickering Richmond Ripon Scarborough Selby Settle Skipton Tadcaster Thirsk Whitby York.

SAP Standard Assessment Procedure EPC Energy Assessments Northamptonshire: Brackley, Corby, Daventry, Fotheringhay, Kettering, Northampton, Oundle, Rushden, Towcester, Wellingborough.

SAP Standard Assessment Procedure EPC Energy Assessments Northumberland: Berwick on Tweed, Alnmouth, Alnwick, Amble, Bamburgh, Bellingham,, Blanchland, Brinkburn, Chillingham, Corbridge, Craster, Haydon Bridge, Hexham, Holy Island, Housesteads, Kielder, Morpeth, Once Brewed, Rothbury Seahouses, Warkworth.

SAP Standard Assessment Procedure EPC Energy Assessments Nottinghamshire: Nottingham, Mansfield, Newark, Retford, Worksop, Warsop.

SAP Standard Assessment Procedure EPC Energy Assessments Oxfordshire: Abingdon, Banbury, Bicester, Burford, Chipping Norton, Didcot, Dorchester, Faringdon, Goring, Henley, Oxford, Thame, Uffington, Wallingford, Wantage, Watlington, Witney, Woodstock.

SAP Standard Assessment Procedure EPC Energy Assessments Shropshire: Bishops Castle, Bridgnorth, Broseley, Bucknell, Church Stretton, Craven Arms, Ellesmere, Ludlow, Lydbury North, Market Drayton, Much Wenlock, Newport, Oswestry, Shifnal, Shrewsbury, Telford, Wem, Whitchurch.

SAP Standard Assessment Procedure EPC Energy Assessments South Wales: Aberdare, Aberfan, Abergavenny, Bargoed, Barry, Blackwood, Blaenavon, Bridgend, Brynmawr, Butetown, Caerphilly, Caldicot, Cardiff, Chepstow, Cowbridge, Cwmbran, Ebbw Vale, Flat Holm, Llantwit Major, Maesteg, Magor, Merthyr Tydfil, Monmouth, Nant-y-moel, Newbridge, Newport, New Tredegar, Penarth, Pontypool, Pontypridd, Porthcawl, Tredegar, Treorchy, Usk, Afan Valley, Ammanford, Cardigan, Carmarthen, Fishguard, Gorseinon, Haverfordwest, Kidwelly, Laugharne, Llandeilo, Llandovery, Llandysul Llanelli, Milford Haven, Morriston, Mumbles, Narberth, Neath, Newcastle Emlyn, Newport, Neyland, Pembroke, Pembroke Dock, Pontardawe, Pontarddulais, Port Talbot, Saundersfoot, St Clears, St David's, Swansea.

SAP Standard Assessment Procedure EPC Energy Assessments South Yorkshire: Barnsley Doncaster Mexborough Rotherham Sheffield.

SAP Standard Assessment Procedure EPC Energy Assessments Somerset: Bridgwater, Burnham-on-Sea, Chard, Cheddar, Crewkerne, Dulverton, Dunster, Exford, Frome, Glastonbury, Highbridge, Hinton St George, Ilchester, Ilminster, Langport, Martock, Merriott, Minehead, Montacute, Porlock, Shepton Mallet, Somerton, South Petherton, Stoke-Sub-Hamdon, Street, Taunton, Templecombe, Watchet, Wedmore, Wellington, Wells, Wincanton, Yeovil.

SAP Standard Assessment Procedure EPC Energy Assessments Staffordshire: Burntwood Burton-On-Trent Cannock Leek Lichfield Newcastle Rugeley Stafford Stoke-On-Trent Stone Tamworth Uttoxeter.

SAP Standard Assessment Procedure EPC Energy Assessments Suffolk: Aldeburgh, Beccles, Boxford, Brandon, Bungay, Bures, Bury St Edmunds, Dunwich, East Bergholt, Eye, Felixstowe, Framlingham, Hadleigh, Halesworth, Haverhill, Ipswich, Lavenham, Leiston, Long Melford, Lowestoft, Mildenhall, Nayland, Newmarket, Orford, Saxmundham, Shotley Gate, Southwold, Stanton, Stowmarket, Sudbury, Woodbridge.

SAP Standard Assessment Procedure EPC Energy Assessments Surrey: Addlestone Ashford Ashtead Banstead Brookwood Camberley Croydon Caterham Chertsey Chobham Cobham Cranleigh Dorking Earlswood East and West Molesey Egham Epsom Esher Farnham Frimley Godalming Godstone Guildford Haslemere Hindhead Horley Kingston Upon Thames Leatherhead Limpsfield Lingfield Oxted Richmond Redhill Reigate Shepperton Staines Stanwell Sunbury-on-Thames Walton-on-Thames Weybridge Woking.

SAP Standard Assessment Procedure EPC Energy Assessments Sussex: East Sussex: Battle, Bexhill-On-Sea, Brighton, Crowborough, Eastbourne, Etchingham, Forest Row, Hailsham, Hartfield, Hastings, Heathfield, Hove, Lewes, Mayfield, Newhaven, Peacehaven, Pevensey, Polegate, Robertsbridge, Rye, Seaford, St Leonards-On-Sea, Uckfield, Wadhurst, Winchelsea. West Sussex: Arundel, Billingshurst, Bognor Regis, Burgess Hill, Chichester, Crawley, East Grinstead, Gatwick, Hassocks, Haywards Heath, Henfield, Horsham, Lancing, Littlehampton, Midhurst, Petworth, Pulborough, Shoreham-By-Sea, Steyning, Worthing.

SAP Standard Assessment Procedure EPC Energy Assessments Warwickshire: Alcester, Atherstone, Bedworth, Henley-In-Arden, Gaydon, Kenilworth, Leamington Spa, Nuneaton, Rugby, Shipston on Stour, Southam, Stratford upon Avon, Studley, Warwick.

SAP Standard Assessment Procedure EPC Energy Assessments West Midlands: Bilston, Birmingham, Brierley Hill, Coventry, Cradley Heath, Dudley, Halesowen, Kingswinford, Oldbury, Rowley Regis, Smethwick, Solihull, Stourbridge, Sutton Coldfield, Tipton, Walsall, Wednesbury, West Bromwich, Willenhall, Wolverhampton.

SAP Standard Assessment Procedure EPC Energy Assessments Wiltshire: Amesbury, Bradford-On-Avon, Calne, Chippenham, Corsham, Devizes, Malmesbury, Marlborough, Melksham, Pewsey, Salisbury, Swindon, Trowbridge, Warminster, Westbury, Wilton.

SAP Standard Assessment Procedure EPC Energy Assessments Worcestershire: Bewdley, Broadway, Bromsgrove, Droitwich, Evesham, Great Malvern, Kidderminster, Pershore, Redditch, Stourport, Tenbury Wells, Worcester.

SAP Standard Assessment Procedure EPC Energy Assessments West Yorkshire: Batley, Bingley, Bradford, Brighouse, Castleford, Cleckheaton, Dewsbury, Elland, Halifax, Hebden Bridge, Heckmondwike, Holmfirth, Huddersfield, Ilkley, Keighley, Knottingley, Leeds, Liversedge, Mirfield, Normanton, Ossett, Otley, Pontefract, Pudsey, Shipley, Sowerby Bridge, Wakefield, Wetherby.

We can also provide advice and tests for Air Tightness Testing Air Leakage Testing & Air Pressure Testing of buildings.

Whether you are a private builder, or major house builder, large scale housing developments with large plots requiring SAP Energy Assessment for buildings compliance checks, we can help. We can also provide PEA (Predicted Energy Assessment)  for new homes and existing dwellings and New Build Commercial & Industrial Units, and existing buildings.

For more information please refer to Commercial Buildings Energy Assessment