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Energy and performance calculations
The calculations that show a design meets Part L, Part O and Part G before work starts, and the as-built figures building control asks for at completion.
In this group
12 services, each scoped in writing.
Add the ones you think apply and we will combine them into one quote request. If you are unsure, add your best guess and tell us about the project.
- Energy and SAP calculations
Design-stage and as-built SAP calculations for new and converted homes, with the EPC lodged at completion.
Part L · Design stage
- SBEM and BRUKL calculations
Energy compliance calculations for new buildings other than homes, and some extensions, with the BRUKL output report.
Part L · Design stage
- Energy statements
Energy and carbon statements for planning applications, written to the local plan policy that applies.
Planning · Design stage
- Overheating assessments
Simplified method or dynamic modelling to show new homes and other new residential buildings limit overheating in summer.
Part O · Design stage
- U-value calculations
Heat-loss calculations for walls, floors and roofs, so the specification can be checked before build.
Part L · Design stage
- Thermal bridging and psi-values
Junction calculations that replace default values in SAP and can improve the result.
Part L · Design stage
- Overglazed extension calculations
Calculations showing an extension with generous glazing still meets the energy standard.
Part L · Design stage
- Part L evidence support
Photographic evidence and the BREL report, gathered during the build and issued at completion.
Part L · During the build
- Sustainability statements
Statements covering energy, water, materials and waste for planning submissions.
Planning · Design stage
- BREEAM assessment support
Support through BREEAM pre-assessment, design and post-construction stages.
Planning · Design stage
- Daylight and sunlight assessments
Daylight to new rooms, and the effect of a scheme on neighbouring properties.
Planning · Design stage
- Water efficiency calculations
Calculations showing new homes meet the water use limit: 125 litres per person per day, or 110 where a planning condition requires it.
Part G · Design stage
Timing
When these are usually needed.
Most of this work falls at design stage or just before completion. Booking early avoids delays at sign-off.
1Design stage
2During the build
3Before completion
Nothing from this group at this stage.
Guidance on this page refers to Building Regulations in England. What applies depends on the building and the work, and your quotation confirms it. Approval and completion decisions remain with your building control body.
Also for building projects
Related groups
Request a quote
Not sure which of these you need?
Tell us about the building and the stage it has reached. We will set out what applies in a written quotation.