SAP ASSESSMENTS
Design-stage and as-built SAP assessments for new homes, conversions and extensions. Practical guidance is provided throughout the project to help achieve Part L compliance, followed by the final EPC where required.
AIR TIGHTNESS TESTING
Compliant airtightness testing for new-build, low-energy and existing homes. Services include pre-completion testing, final certification and smoke diagnostics to identify air leakage and improve building performance.
RESIDENTIAL SuDS DESIGN
Surface-water drainage design and SAB application support for residential developments across Wales. Services include infiltration testing, soakaway and attenuation design, technical drawings, calculations and submission documentation.
Energy Building performance and compliance, coordinated from design to completion.
Independent SAP assessments, airtightness testing and SuDS design for new-build, conversion and retrofit projects across Wales—supporting architects, developers, housing associations and self-builders.
Yn cefnogi penseiri, datblygwyr tai, cymdeithasau tai ac adeiladwyr dros Gymru i gyflawni prosiectau mor gynaliadwy â phosib.
Planning a project?
Contact AER to discuss your project requirements, programme and the most appropriate level of support.
Complete New Build Energy Compliance Package -
SAP assessment and airtightness testing from one consultant
Design-stage SAP Assessment ➜ Construction-stage Advice ➜ Optional Mid-construction Airtightness Diagnostics Test ➜ Final Mandatory Airtightness Test ➜ As-built SAP Assessment ➜ EPC
Early advice helps establish achievable fabric, heating and airtightness specifications, while continuity through construction reduces delays, conflicting information and the risk of non-compliance at completion.
CONTACT /CYSYLLTWCH
Dafydd@AERbuildingperformance.co.uk
07837739100 (8am-5pm Monday to Friday)
© 2025. All rights reserved.
Dafydd Morgan MCIAT
Elmhurst Approved Level 1 Airtightness Tester
Elmhurst Approved OCDEA (SAP) Assessor
Chartered Architectural Technologist