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domestic energy compliance, made clear

Practical energy reports for confident project decisions

From planning stage energy reports to full energy modelling and thermal bridging analysis, RJ Energy helps architects, developers, builders and homeowners understand what their project needs—and move forward with clear, useful assessments.

Talk to us about your projectExplore our services
Design-stage and as-built supportEasy to understand guidance throughout Clear scope and responsive communication
Modern home with solar panels and an air source heat pump
Clear advice. Useful reports.

Our services

The right assessment for each stage of your project

We review your drawings, specification and project requirements, then explain the requirements and the information needed. Where a report depends on a local policy or building-control route, we confirm the applicable brief before work starts.
New red brick detached homes in a residential development
SAP

SAP calculations & BREL reports

Design-stage and as-built support for new homes, conversions and extensions, including Part L/BREL reports in England/Wales and Section 6 in Scotland . Explore the service →
Contemporary home with extensive glazing and solar panels at dusk
O

Overheating

Assessment of overheating risk using CIBSE TM59 analysis and consideration of  mitigation options. Reports for Part O/section 3.28. Explore the service →
Thermal bridging analysis showing temperature contours through a construction junction
Ψ

Thermal bridging analysis

Project-specific PSI-value calculations for construction junctions, supporting fabric decisions and SAP inputs. Explore the service →
Water flowing through a chrome tap
H₂O

Water efficiency calculations

Calculations to determine expected daily water use from proposed fittings to achieve a maximum use of 125 litres per person per day in line with Approved Document Part G. Explore the service →
Energy reporting illustration with performance charts, renewable energy and sustainable transport
PLAN

Planning energy reports

Energy statements and carbon reporting shaped around planning policy and local authority targets. Reports are bespoke for each project. Explore the service →
Architectural model of a contemporary home on building plans
PHPP

Passivhaus & PHPP

PHPP energy modelling support for Passivhaus and low energy projects, helping design teams assess the energy balance and coordinate design decisions. Explore the service →
Working across the UK: building regulations and planning requirements differ between nations and local authorities. We confirm the relevant jurisdiction, assessment route and target for your project before preparing a report.

A straightforward process

From first plans to a useful report

We keep the next steps clear, so your team knows what we need and when.
Illustrative image of building design information being reviewed on a tablet
STEP 01

Send your project information

Share drawings, location, project type, specification and any planning or building-control notes you already have.
STEP 02

Confirm scope and fee

We identify the likely assessments, information gaps, assumptions and deliverables for your brief.
STEP 03

Review the design

We assess the submitted information and flag questions or design options that could affect the report.
STEP 04

Receive clear outputs

You receive the agreed reports, with practical notes on any follow-up information required.

Common questions

Energy assessment FAQs

What do you need to provide a quote?

Usually the site location, project type, floor plans, elevations, sections, construction specification and any planning or building-control requirements. If something is not ready, send what you have and we can explain the next useful step.

Can SAP and thermal bridging work be coordinated?

Yes. PSI values from thermal bridging analysis previously undertaken can be considered in a SAP assessment when the junction details and calculation outputs are appropriate for the project. Where you don’t have PSI values available to use then we can calculate these for you where accurate junction drawings have been provided and the results used in the SAP calculation.

When should we start?

As early as practical. Early assessments give the design team more opportunity to compare options before drawings and specifications are fixed.

Do requirements differ by location?

Yes. Building regulations apply differently across England, Wales, Scotland and Northern Ireland, and planning policies are set locally. We confirm the applicable route with you at the start.

Tell us about your project

Send your plans and the requirements you have received. We’ll help you identify a sensible next step and the information needed to scope the work.

Report scope and turnaround are confirmed against your project information and agreed brief.

Request a project quote