Professional Part L Compliance for Residential & Commercial Developments
Energy Core Compliance provides a complete range of Part L compliance services across the UK.
We support projects from design stage through to completion, helping architects, developers, builders and property professionals meet Building Regulations requirements.
Our Compliance Services
✅ SAP Calculations (Residential)
✅ BRUKL Reports
✅ Part L Compliance Assessments
✅ Design Stage Assessments
✅ As- Built Calculations and EPCs
✅ TM52 & TM59 Overheating Assessments
✅ Part G Water Calculations
✅ U-Value Calculations
From single dwellings and extensions through to large commercial developments, we provide the calculations, modelling and compliance reports required to satisfy Building Control and Building Regulations requirements.
SAP Calculations for Residential Developments
SAP (Standard Assessment Procedure) calculations are required for most new-build homes and many residential conversions to demonstrate compliance with Part L of the Building Regulations.
SAP calculations assess the predicted energy performance of a dwelling by considering factors such as:
- Construction materials
- Insulation levels
- Heating systems
- Hot water systems
- Ventilation
- Windows and glazing
- Renewable technologies
- Air permeability
The calculations compare the property’s predicted energy performance against the required target values established within Building Regulations.
SAP assessments are normally undertaken at:
Design Stage
Used to demonstrate compliance before construction begins and identify any improvements required.
As-Built Stage
Completed following construction to confirm the dwelling has been built in accordance with the approved design and to produce the final Energy Performance Certificate (EPC).
We provide SAP calculations for:
✅ New Build Dwellings
✅ Housing Developments
✅ Self-Build Projects
✅ Residential Conversions
✅ Extensions Requiring Compliance Assessment
BRUKL Reports & SBEM Calculations
Commercial buildings require SBEM (Simplified Building Energy Model) calculations to demonstrate compliance with Part L.
The results are produced within a BRUKL Report (Building Regulations UK Part L Report), which is submitted to Building Control as evidence that the proposed building satisfies energy performance requirements.
BRUKL calculations are commonly required for:
- Offices
- Retail Units
- Industrial Buildings
- Warehouses
- Schools
- Healthcare Buildings
- Hotels
- Community Buildings
- Mixed-Use Developments
We work alongside design teams to identify practical improvements where compliance targets are not initially achieved.
Who Requires Part L Compliance?
Our services are regularly used by:
- Property Developers
- House Builders
- Commercial Developers
- Architects
- Planning Consultants
- Building Surveyors
- Contractors
- Self-Build Clients
- Housing Associations
- Local Authorities
- Property Investors
Whether your project involves a single dwelling or a large commercial development, we can provide the energy assessments needed for Building Regulations approval.
Why Choose Energy Core Compliance?
Experienced Energy Consultants
Our assessors have extensive experience supporting both residential and commercial developments.
Residential & Commercial Expertise
We provide SAP and BRUKL assessments under one roof, simplifying projects involving mixed-use developments.
Fast Turnaround Times
We understand construction deadlines and provide responsive, reliable reporting.
Practical Compliance Advice
Where compliance isn’t achieved initially, we recommend realistic and cost-effective design improvements.
Nationwide Coverage
Supporting clients across England and Wales.
Ongoing Technical Support
We work with your project team throughout the design and construction process to help avoid costly delays.
Our Part L Compliance Process
Step 1 – Review Your Drawings
We review your architectural plans, construction details and specifications.
Step 2 – Carry Out Energy Calculations
We complete the required SAP or SBEM assessment using approved software.
Step 3 – Compliance Review
If improvements are required, we’ll explain the most effective options to achieve compliance.
Step 4 – Issue Reports
We provide all documentation required by Building Control, including BRUKL reports or SAP calculations.
Step 5 – Final Certification
Following construction, we complete any required as-built calculations and arrange the production of your EPC where applicable.
Request a Part L Compliance Quote
Whether you’re designing a new home, converting an existing building or delivering a commercial development, Energy Core Compliance can provide the professional guidance and calculations needed to achieve Part L compliance.
Contact us today for a free, no-obligation quotation and let our experienced team help keep your project on track.
Need SAP or BRUKL, Part L Compliance Support?
Whether you’re working on a new build, conversion, extension or commercial development, Energy Core Compliance can provide the calculations and compliance reports required to support your project.
✅ Fast Turnaround Times
✅ Residential & Commercial Expertise
✅ Nationwide Coverage
✅ Accredited Assessors
Contact us with your plans and specifications for a fast and competitive quotation.
Frequently Asked Questions
What is Part L of the Building Regulations?
Part L is the section of the Building Regulations that sets minimum standards for the conservation of fuel and power in buildings. Its primary objective is to improve the energy efficiency of both residential and commercial properties by reducing energy consumption, lowering carbon emissions and encouraging the use of more sustainable building methods.
Part L applies to most new-build developments, many building conversions, extensions and certain renovation projects where energy performance may be affected. Compliance is normally demonstrated through approved energy assessments such as SAP Calculations for residential properties and SBEM/BRUKL Reports for commercial buildings.
Achieving Part L compliance is a mandatory requirement before Building Control can sign off many construction projects. Early consideration of energy performance can also help reduce long-term operating costs and improve the overall value of a building.
What is a SAP Calculation?
A SAP Calculation (Standard Assessment Procedure) is the Government’s approved methodology for assessing the predicted energy performance of new residential properties.
The calculation considers a wide range of factors that influence a home’s energy efficiency, including:
- Wall, roof and floor insulation
- Window and door specifications
- Heating and hot water systems
- Ventilation systems
- Air permeability
- Lighting efficiency
- Renewable energy technologies such as solar PV
- Thermal bridging details
SAP Calculations compare the dwelling’s predicted energy performance against the Target Emission Rate (TER) and Target Primary Energy Rate (TPER) required under Part L of the Building Regulations.
A Design Stage SAP Calculation is completed before construction begins to demonstrate compliance. Once the property has been built, an As-Built SAP Calculation confirms that the finished dwelling matches the approved specification and enables the production of the final Energy Performance Certificate (EPC).
Our experienced assessors work closely with designers and builders to identify any compliance issues early, helping to avoid costly design changes later in the project.
What is a BRUKL report?
A BRUKL Report (Building Regulations UK Part L Report) is the compliance document produced from SBEM (Simplified Building Energy Model) calculations for commercial buildings.
The report demonstrates that a proposed building meets the energy performance requirements of Part L by comparing its predicted carbon emissions and energy use against the standards set within the Building Regulations.
BRUKL Reports are commonly required for:
- Offices
- Retail premises
- Industrial units
- Warehouses
- Schools
- Healthcare facilities
- Hotels
- Leisure centres
- Mixed-use developments
The report is submitted to Building Control as evidence that the building has been designed to achieve the required energy efficiency standards.
Where a design does not initially comply, we can review the building specification and recommend practical improvements that help achieve compliance without unnecessary construction costs.
When are Part L calculations required?
Part L calculations are usually required at the earliest stages of a project, often before Building Regulations approval is granted.
A Design Stage assessment enables your architect, developer or contractor to demonstrate that the proposed building will meet the required energy performance standards before construction begins.
Once construction has been completed, an As-Built assessment is normally required to verify that the property has been built in accordance with the approved specification. This may include updated calculations if products or construction methods have changed during the build.
Obtaining energy calculations early in the design process can prevent delays, reduce redesign costs and provide confidence that the project is progressing towards compliance.
What is the difference between SAP and BRUKL?
Although both assessments demonstrate compliance with Part L of the Building Regulations, they apply to different types of buildings.
SAP Calculations are used for:
- New-build houses
- Flats and apartments
- Residential conversions
- Some change-of-use developments
BRUKL Reports, generated using SBEM calculations, are used for:
- Commercial offices
- Shops and retail units
- Industrial buildings
- Warehouses
- Educational buildings
- Healthcare premises
- Hotels and hospitality buildings
The information required, calculation methods and compliance targets differ between SAP and SBEM, making it important that the correct assessment is completed for your project.
If your development includes both residential and commercial elements, such as mixed-use schemes, we can provide both SAP and BRUKL assessments to simplify the compliance process.
What information do you need to complete SAP or BRUKL Calculations ?
To produce accurate calculations, we typically require:
- Architectural floor plans
- Elevations and sections
- Construction specifications
- Insulation and U-value details
- Window and door schedules
- Heating system specifications
- Hot water system details
- Ventilation strategy
- Air permeability target
- Lighting specifications
- Renewable energy details (where applicable)
If all of the information is not yet available, we can often work with preliminary drawings and provide provisional assessments while the design develops.
Working with us early allows potential compliance issues to be identified before construction begins, saving both time and money.
What happens if my design doesn’t comply with Part L?
It is not unusual for an initial design to fall short of the required Part L standards, particularly during the early design stages.
If this happens, we review the calculations in detail and provide practical recommendations to improve the building’s energy performance.
Possible improvements may include:
- Increasing insulation levels
- Improving window and glazing specifications
- Reducing thermal bridging
- Improving air tightness
- Upgrading heating or hot water systems
- Installing low-energy lighting
- Introducing renewable technologies such as solar PV
- Improving ventilation efficiency
Our aim is to identify the most cost-effective solution that achieves compliance while minimising disruption to the overall design and construction programme.
Can you work directly with our architect or design team?
Absolutely.
We regularly work alongside architects, architectural technologists, developers, builders, M&E consultants and planning professionals throughout every stage of the design and construction process.
By becoming involved early, we can review the proposed specification, identify potential compliance issues and suggest practical improvements before planning or Building Regulations submissions are made.
This collaborative approach often reduces costly redesigns, avoids construction delays and helps ensure your project progresses smoothly through Building Control.
We also remain available throughout the build to answer technical questions, update calculations if specifications change and provide the final documentation required for project completion.
Why should I appoint a Part L Consultant early in my project?
Engaging a Part L consultant during the design phase can save significant time and money.
Early assessments allow potential compliance issues to be identified before construction begins, giving your design team the opportunity to make simple, cost-effective changes rather than expensive alterations later in the build.
Early involvement can also help:
- Reduce the risk of Building Control delays
- Improve the overall energy performance of the building
- Minimise costly specification changes
- Coordinate SAP, BRUKL and EPC requirements
- Improve the likelihood of first-time compliance
At Energy Core Compliance, we work proactively with your project team to ensure energy compliance becomes an integrated part of the design process rather than a last-minute hurdle.