Offices Nationwide 

Bristol - SAP Extension Calculations - 0117 212 0189

The office that covers this area is: Cardiff

Phone Number: 0117 212 0189 Email:

Bristol - SAP Extension Calculations / SAP Extension Assessment

These are a Government defined process in accordance with Part L1B Building Control Regulation Compliance of Domestic Property SAP Extension Calculations are the Government's Standard Assessment Procedure for Energy Rating of Dwellings.

Since 6th April 2006, Part L1B has required SAP Extension Calculations to be carried out on every new conversion.

You will automatically achieve Compliance with Part L1B if the extension envelope is sufficiently insulated, the area of all openings is within the 25% allowance and building service are sufficient.

All SAP Extension Calculations are calculated in accordance with Part L1B of the building regulations.

By upgrading or over compensating in construction of other elements, or perhaps demonstrating additional solar gains, the negative impact of larger expanses of glass can be removed.

There are further options to upgrade the existing property - especially useful if the existing dwelling is receiving a make-over too. We can guide you through all the options.

Many change of use schemes will also be subject to SAP regulations, like flat conversions or commercial-to-residential conversions

Many extension designs do not comply with the minimum Part L1b regulations.

These require that areas of new glazing account for no more than 25% of new floor area.

We can help you overcome this hurdle easily and quickly.

The Calculation is produced by creating a Notional and proposed version of the entire dwelling. The notional dwelling is the current building with the extension, this has the known current U Values of the building and the proposed extension defaulted to the L1B 'Upgraded Thermal Elements' standards. This 'Notional' SAP calculation provides a calculated level of annual carbon dioxide emissions which in turn provides a target threshold for the proposed works. The proposed building will be same but with the actual proposed U Values that are going to be used for the new thermal elements and openings. The associated annual carbon dioxide emissions are then compared to the previously calculated target rate.

Conversely, if the proposed extension carbon dioxide emissions are greater than the calculated target threshold, then trade-off improvements will be required to either the extension specification or the existing house as a means offsetting the additional heat loss associated with the extra levels of glazing within the proposed extension above the standard threshold detailed within the Building Regulations

E2 Consultants in Bristol can undertake SAP Calcs to demonstrate compliance with Part L1B (England and Wales) Building Regulations for new build dwellings, extensions and conversions.

At E2 Consultants Bristol we pride ourselves on being able to provide all of the Part L services. Aswell as SAP Extension Calculations we also provide "On Construction" EPCs, Air Tightness/pressureTesting, sound / acoustic testing, A SAP Extension Calculations assessments / BREEAM assessments with consultancy. As part of our service we advise our clients as to how they can best achieve compliance in the most cost effective manner, for this reason all of our SAP Extension Calculations are site specific. Alterations are free of charge and our SAP assessors will also liaise with Building Control Officers on your behalf.

Our Consultants in Bristol are multi-disciplined and can carry provide you with more services in one visit to give you a great cost effective package.

E2 Consultants in Bristol can also provide you with a "On Construction" Energy Performance Certificates (EPCs), they are produced using the SAP methodology and are undertaken by one of our OCDEA (On Construction DEA). The certificates are needed if a property is to be sold or let, they can also be requested by Building Control. Whether E2 Consultants have completed your initial SAP Extension Calculations, your initial SAP assessor is not qualified to produce "On Construction" EPCs or SAP Extension Calculations have not already been carried out on the development, E2 Consultants are able to produce your On Construction Energy Performance Certificates (EPCs).

E2 Consultants in Bristol will try to beat any other price that you might receive. Call one of our regional offices and speak to one of our sap Extension calculation experts on 0117 212 0189 or email for a formal quotation.

Our other services include:
Thermography, Code 4 Sustainable Homes, SAP Conversion Calculations, Acoustic Testing, Air Leakage Testing, On Construction EPC, Part G - Water Calculations, Part F Ventilation Testing, Sustainability Statements, Part E, Environmental Noise, Energy Statements, SAP Calculations (TER/DER),

SAP Extension Calculations can also be known as:
SAP Extension Assessment,

E2 Specialist Consultants
June 19 at 5:17pm
An office-based E2 consultant is working on the SAP calculation and EPC for a domestic new build in North Wales. For all your SAP needs in North Wales, visit our dedicated site:

E2 Consultants Delivering compliance solutions for Architects & Developers    Head Office E2 HOUSE, South Park Way, Wakefield 41 Business Park, WF2 0XJ    Questions? Call: 0800 043 8100