How Can We Help You?

Yes. While current rules require a minimum 'E' rating for rented homes, incoming regulations aim to raise this minimum threshold to a 'C' rating for new tenancies soon (and eventually all tenancies). If your property is rated D or below, we can conduct an assessment now and provide targeted improvement advice to help you reach a 'C' rating without overspending on unnecessary upgrades.

Failing to provide an EPC or renting a non-compliant property can result in substantial fines. For residential properties, fines can be up to £5,000. For commercial properties, the penalty is based on the rateable value of the building, up to a maximum of £150,000.

We pride ourselves on speed. We usually issue and lodge the final EPC Certification on the national register within 24 to 48 hours of completing all mandatory site tests (Air Test, Sound Test, etc.) and receiving the final evidence documentation from your site manager.

Your site manager must keep clear, geo-located, and dated photographic evidence (the BREL report) showing the installation of insulation, specific products, and airtight membranes before they are covered by plasterboard. This is vital evidence for the final as-built EPC and SAP/SBEM reports.

You need to commission the initial design stage SAP calculation before submitting your plans to Building Control or starting construction. This early assessment confirms your design meets Part L of the Building Regulations and allows us to make cost-effective changes if needed on paper.

If your design fails the initial calculation, we don't just hand you a failure notice. We provide a pass report detailing the precise, least-costly remedial options. These options might include increasing insulation thickness, improving heating system efficiency, or tightening air permeability targets.

We use SAP (Standard Assessment Procedure) exclusively for all new and existing domestic dwellings (houses and flats). We use SBEM (Simplified Building Energy Model) for all non-domestic buildings (shops, offices, schools, warehouses, etc.). Both demonstrate Part L compliance.

Yes, we specialize in non-domestic SBEM calculations for complex structures like mixed-use developments, schools, and large retail units. We meticulously model the building’s geometry, zoning, and proposed mechanical systems to confirm Part L compliance.

Yes, you must inform us immediately. Any change in thermal performance (windows, insulation type, heating system) requires a recalculation to ensure the design still passes Part L before construction progresses, saving you from a highly stressful compliance failure at completion.

The Overheating Assessment uses CIBSE TM59 methodology to dynamically model summer temperatures inside your building. It ensures your design avoids excessive heat build-up, protecting occupants from uncomfortable or unsafe conditions, and confirms compliance with Part O of the Building Regulations.

For heavily glazed extensions, we perform an Overglazed Extension Calculation (often via SAP). This confirms the area of new glazing does not exceed the allowed limit relative to the floor area. If it does, we specify compensatory measures—like higher thermal performance in the walls or roof—to achieve a pass.

Absolutely. We calculate the required U-values for your walls, roofs, floors, and glazing. We then advise your design team or builder on specific material specifications (e.g., precise PIR insulation thickness) that guarantee you achieve the necessary thermal performance.

We need the proposed specifications for all sanitary fittings, including flow rates for taps and showers (litres per minute), and flush volumes for WCs. This allows us to prove the design meets the mandatory Part G target of 125 (or 110 in London/specific councils) litres per person per day.

For Material Change of Use conversions, we perform Part L1B SAP calculations. You will also almost certainly require Sound Insulation Testing (Part E) and potentially Air Tightness Testing. We ensure the retrofitted building meets modern energy standards while respecting the limitations of the existing structure.

Book the Air Tightness Test as soon as the building envelope is completely sealed. This means all windows and external doors are fitted, plastering is complete, and all service penetration holes are sealed, but critically, before skirtings and final cosmetic finishes are applied, just in case remedial work is needed.

Your site manager must ensure all intentional ventilation (e.g., trickle vents, extract fans, MVHR ducts) is temporarily sealed, and all obvious unintentional penetrations (around pipes, cables, and window frames) have proper permanent airtight seals. We provide a comprehensive pre-test checklist to guide your site team.

If the test fails, our engineer immediately conducts a diagnostic survey using smoke pencils to locate the exact air leakage paths. Your site team then performs targeted remedial sealing on the spot, and we conduct a retest immediately—often avoiding the cost and delay of a full rebooking.

We test a sample set of dwellings, typically 1 set of tests per 10 dwellings of a single construction type. The exact number depends on the variety of construction types and layouts. We analyze your plans and determine the minimum compliant sampling rate required by Part E of the Building Regulations.

Sound Test failures most often result from poor detailing at wall-to-floor junctions (flanking transmission), lack of robust acoustic seals around penetrating pipework, or the incorrect installation/bridging of resilient acoustic layers in separating floors.

Yes, under Part F regulations, we conduct the required tests on all mechanical ventilation systems (like MVHR, MEV, and intermittent extract fans). We accurately measure the flow rates, physically balance the system valves, and issue the final commissioning certificate for submission to Building Control.

We use specialized high-pressure fan equipment to pressurize the smoke shaft system and measure the air leakage rate against the EN 12101-6 mandated limits. This confirms the shaft will draw smoke effectively and safely away from escape routes in the event of a fire.

Yes, we perform the highly precise Air Leakage Testing required for Passivehaus and EnerPHit certification. We understand the stringent targets (achieving ≤0.6 ACH@50Pa) and the exact graph documentation required by Passivehaus certifiers.

Absolutely. Our Part-Built Checks (diagnostic air testing and smoke testing) allow us to inspect critical details, such as complex junction sealing, before they are covered by plasterboard. Fixing issues mid-build is exponentially cheaper than discovering them at completion.

We schedule our site visits efficiently, arrive fully equipped, and communicate necessary preparation steps clearly in advance to your site manager. Our engineers work quickly and autonomously, actively aiming to complete their tests without holding up other trades on site.