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SAP Calculations for Part L Compliance
Professional SAP Calculations & New Build for Part L compliance. Fast turnaround and clear pricing. Reports for Building Control across the UK.
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SAP Calculations
What is a SAP calculation?
An energy assessment required for new builds, extensions and conversions to meet Part L Building Regulations.
Who needs SAP calculations?
New builds, extensions over certain sizes, and most dwelling conversions require SAP calculations.
How much do SAP calculations cost?
New builds from £170, extensions from £150. Fixed prices with no hidden extras.
How long do SAP calculations take?
Most projects completed within 2–4 working days once we have your drawings.
What do you need from me?
Floor plans, elevations, construction details, heating spec and window schedule.
Will Building Control accept your reports?
Yes. All reports completed by Elmhurst accredited OCDEA and accepted by Building Control across the UK.
Ready to get your SAP calculations sorted? Fixed prices, fast turnaround and Building Control approved reports.
What Are SAP Calculations?
SAP Calculations (Standard Assessment Procedure Calculations) are energy assessments required for new builds, extensions and conversions to demonstrate compliance with Part L Building Regulations. They evaluate a property's thermal performance, energy consumption and carbon emissions.
The calculation looks at how the property is designed, including insulation, building materials, the heating system and glazing, and predicts how much energy the home will use throughout the year.
The calculation uses SAP 10 methodology to assess thermal performance, including U-values for walls, floors and roofs, air permeability rates, thermal bridging and the building fabric efficiency.
Your SAP report must be completed by an accredited assessor and submitted to Building Control before construction begins (Design SAP) and once the property is built (As-Built SAP).
Who Needs SAP Calculations?
SAP Calculations are required for most domestic projects in the UK. If you are building a new home, extending an existing one or converting a building into a dwelling, you will need a SAP assessment.
New Builds
All new dwellings must have a SAP Calculation before construction begins and again once the property is completed.
Extensions
Many extensions need SAP, especially when glazing exceeds limits or heat loss needs balancing to pass Part L.
Conversions
Converting a building into a dwelling normally requires SAP to meet energy efficiency standards.
What's Included in Our SAP Calculations Service
Our SAP service gives you everything you need to meet Part L requirements and keep your project moving without delays.
- SAP Design Stage calculation and thermal modelling
- Full guidance to achieve Part L compliance
- Assessment of U-values, thermal bridging and air permeability
- Unlimited specification revisions
- Clear recommendations to help your design pass SAP
- Carbon emissions and energy rating calculations
- As-Built SAP and EPC available as an upgrade
- Email support for Building Control queries
- Fast turnaround times
SAP Calculations Pricing
Our SAP prices are fixed and transparent, with no hidden extras. Volume discounts available for multiple plots.
New Builds
From £170
Per dwelling, per stage
Extensions
From £95
Glazing check or full SAP
Conversions
From £170
Per dwelling, per stage
Fast 2-4 Day SAP Calculations: How It Works
Getting your SAP Calculation is straightforward. There is no complicated paperwork and we guide you through each stage.
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1
Upload your plans
Send us your drawings and basic project details. We review everything and confirm what is needed for compliance.
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2
We complete your SAP 10 model
We build your SAP 10 energy model, calculating U-values, thermal performance and carbon emissions. Unlimited revisions included.
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3
Receive your SAP report
You receive your Design Stage SAP report along with clear guidance on how to stay compliant through the build.
What We Need to Complete Your SAP
To complete your SAP Calculation we need a clear set of drawings and a few basic specifications.
- Floor plans with dimensions
- Elevations and sections
- A site plan showing orientation
- Construction details or a build-up summary
- Heating and hot water specification
- Window and door schedule
Don't have everything yet? That's fine — send what you have. See the full interactive checklist →
Why Choose Our SAP Calculations Service
You work directly with an Elmhurst accredited OCDEA, not a call centre or anonymous team. We've got real world construction experience.
What You Get With Us
- Direct access to qualified assessor
- Fixed pricing quoted upfront
- Fast 2-4 day turnaround
- Clear, practical guidance
- Construction industry experience
- Unlimited revisions included
What You Avoid
- Call centre responses
- Hidden fees and extras
- Weeks of waiting
- Technical jargon overload
- Academic-only perspective
- Revision charges
UK-Wide SAP Calculations Coverage
We provide SAP calculations across the entire United Kingdom. Our service covers England, Wales, Scotland and Northern Ireland, with reports accepted by all local Building Control bodies and Approved Inspectors nationwide.
Frequently Asked Questions
How long does a SAP calculation take?
Do I need Part O as well?
What happens if my SAP fails?
Can you help make my design pass?
What is the difference between SAP and EPC?
Do I get the EPC as well?
What do I need to send you?
Will Building Control accept your SAP reports?
Ready to get your SAP Calculation?
All SAP calculations completed by an Elmhurst-accredited OCDEA and accepted by Building Control nationwide.