4 Accreditation Bodies · Zero Backlog

Domestic & Commercial EPC Assessments Across London

Ofqual-regulated Level 3 and Level 4 energy assessors lodging regulation-compliant RdSAP and SBEM EPCs across Elmhurst Energy, ECMK, Quidos, and Sterling Accreditation.

High-Capacity Energy Certification with 4 Accreditation Bodies

Strata Surveying & Retrofit Ltd provides high-volume domestic and commercial Energy Performance Certificate (EPC) surveys across all 32 London boroughs and the South East. Our team of qualified assessors holds active certifications across four major UK accreditation bodies: Elmhurst Energy, ECMK, Quidos, and Sterling Accreditation.

Maintaining active registrations across all four bodies guarantees that your programme never experiences lodgement bottlenecks or accreditation mismatch delays—whether your data is feeding into the English EPC Register, Social Housing Decarbonisation Fund (SHDF), ECO4, or the Warm Homes Plan.

Domestic RdSAP EPCs

Full on-site physical inspection measuring building dimensions, heat loss perimeters, glazing specifications, wall construction types, insulation levels, space heating controls, and secondary systems.

Commercial Non-Domestic EPCs

SBEM Level 3 and Level 4 energy assessments for commercial premises, communal blocks, retail units, offices, and industrial buildings across Greater London.

Strict 8-Day Lodgement SLA

Every completed survey is reviewed by our senior QA desk and lodged directly to the national register within strict agreed SLA windows (under 8 working days).

18-Point Photo Audit Trail

Our AppSheet field platform enforces an 18-point GPS-tagged photo checklist per property, ensuring complete evidentiary integrity for audits and funding verification.

EPC Assessors in London — What to Expect

When you instruct an EPC assessor in London through Strata, you get a single accountable point of contact for the whole certificate lifecycle: booking, on-site inspection, RdSAP/SBEM modelling, QA review, and lodgement. For housing associations and managing agents running programmes rather than single properties, this same team scales from a handful of units to 100+ EPC assessments a week without a change in process or point of contact.

Frequently Asked Questions

How quickly can an EPC assessment be booked in London?

Single-property EPC assessments are typically booked within 2-5 working days, subject to tenant access. Programme instructions (10+ properties) are scheduled on a rolling calendar agreed with your team.

How long does an EPC assessment take on site?

A standard domestic RdSAP EPC assessment takes 30-60 minutes on site depending on property size and complexity. Commercial SBEM assessments vary by floor area and building services.

Do you produce both domestic and commercial EPCs?

Yes — our assessors are accredited for both domestic RdSAP EPCs and non-domestic SBEM EPCs, so mixed-use portfolios can be handled by one team rather than two suppliers.