Energy compliance for extensions, new builds, and conversions
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Planning World
A faster, smarter, more affordable way to get planning permission anywhere in the UK.
SAP Calculations (Standard Assessment Procedure) are required for all new dwellings, many extensions, and certain conversions. They ensure your project meets Part L of the Building Regulations, covering energy efficiency, insulation, heating systems, carbon emissions, and overall building performance.
Planning World provides fast, accurate SAP assessments, tailored recommendations, and full compliance reports ready for Building Control.
When you need SAP Calculations
SAP is required for:
New build houses and flats
Extensions with significant glazing
Barn conversions and change‑of‑use projects
Highly glazed rear extensions
Loft conversions forming new habitable rooms
New heating systems or major thermal upgrades
Projects requiring an EPC on completion
If your project involves creating a new dwelling or significantly altering thermal performance, SAP is mandatory.
For SAP Calculations
What your SAP package includes
A complete SAP assessment typically includes:
Full SAP 10 calculations
U‑value calculations for walls, floors, roofs, and glazing
Thermal bridging assessment
Energy performance modelling
CO₂ emissions analysis
Fabric energy efficiency rating
Heating and hot water system assessment
Recommendations to achieve compliance
As‑built SAP calculations (post‑construction)
EPC (Energy Performance Certificate)
All documents are Building Regulations‑ready and accepted by Building Control.
Our process
A clear, efficient workflow designed to get your project compliant quickly:
Review of drawings and specifications We assess insulation, glazing, heating systems, and construction details.
Compliance strategy If the design fails, we provide targeted recommendations to achieve compliance.
Issue of reports We produce full SAP reports for Building Control and your design team.
Fees
Typical fees start from:
£195–£295 for extensions
£295–£495 for conversions
£495–£795 for new build dwellings
£95 for EPCs (when combined with SAP)
A fixed quote is provided after reviewing your drawings.
Borough‑specific considerations
SAP requirements are national, but local authorities often scrutinise:
Glazing ratios in conservation areas
Thermal upgrades in older buildings
Heating system choices in urban boroughs
Fabric-first approaches in sustainability‑focused councils
Carbon reduction targets in London boroughs
We tailor your SAP strategy to both national regulations and local expectations.
Common mistakes to avoid
Projects often fail SAP or face delays when:
Glazing exceeds allowable limits without compensation
Insulation levels are too low
Heating systems are inefficient or poorly specified
Thermal bridging is ignored
Incorrect U‑values are assumed
SAP is left until the end of the project
Planning World ensures compliance from the start, avoiding costly redesigns.
