# Build Envelope Ltd > Building compliance, design and on-site testing services for residential and commercial developments across England and Wales. ## About Build Envelope Ltd is a building compliance consultancy based in Worcester, England. We provide design stage calculations, on-site testing, and certification services to help developers, housebuilders, architects, and homeowners achieve compliance with Building Regulations. Our services cover Part L (energy), Part E (sound), Part F (ventilation), Part O (overheating), Part G (water), and BS 9991 (fire safety). We are government-accredited OCDEA assessors (EES/030713), ATTMA-accredited testers, and Elmhurst-approved assessors. We serve Birmingham, Bristol, Worcestershire, Gloucestershire, Oxfordshire, the West Midlands, and the wider England and Wales. - Website: https://buildenvelope.co.uk - Phone: 01386 365145 - Email: info@buildenvelope.co.uk - Address: Kingsway House, 40 Foregate Street, Worcester, WR1 1EE - Client Portal: https://portal.buildenvelope.co.uk ## Services ### Design & Planning Stage - [SAP Calculations & EPC Certificates](https://buildenvelope.co.uk/design-and-planning/sap-calculations/): Government-approved energy assessments for new build dwellings under Part L. Design stage and as-built SAP with EPC generation. 3-5 day turnaround. - [SBEM Calculations & BRUKL Reports](https://buildenvelope.co.uk/design-and-planning/sbem-calculations/): Simplified Building Energy Model assessments for commercial and non-domestic buildings. Level 4 and Level 5 NDEA-accredited. - [Overheating Assessments](https://buildenvelope.co.uk/design-and-planning/overheating-assessments/): Approved Document O compliance using simplified and dynamic TM59 methods for new residential buildings. - [Overglazed Extension Calculations](https://buildenvelope.co.uk/design-and-planning/overglazed-extensions/): Area Weighted U-Value and SAP calculations for extensions with more than 25% glazing relative to floor area. - [Energy Statements for Planning](https://buildenvelope.co.uk/design-and-planning/energy-statements/): Energy strategy documents for planning applications demonstrating compliance with local authority sustainability policies. - [U-Value Calculations](https://buildenvelope.co.uk/design-and-planning/u-value-calculations/): Thermal transmittance calculations for walls, roofs, floors, and windows to BS EN ISO 6946 and BS EN ISO 10211. - [PSI-Value Calculations](https://buildenvelope.co.uk/design-and-planning/psi-value-calculations/): Linear thermal transmittance calculations for junctions and thermal bridges to BS EN ISO 10211. Bespoke values to replace withdrawn ACDs. - [Water Usage Calculations](https://buildenvelope.co.uk/design-and-planning/water-usage-calculations/): Part G water efficiency calculations demonstrating consumption does not exceed 125 litres per person per day (or 110 L/p/d in water-stressed areas). ### As Built & On-Site Testing - [Air Tightness Testing](https://buildenvelope.co.uk/as-built/air-tightness-testing/): ATTMA-accredited blower door testing for new build residential and commercial buildings under Part L. From £95+VAT. Pre-test guidance included. - [Air Tightness Testing Worcestershire](https://buildenvelope.co.uk/as-built/air-tightness-testing/worcestershire/): Blower door testing in Worcester, Malvern, Droitwich, Evesham, Bromsgrove and Redditch. - [Air Tightness Testing Birmingham](https://buildenvelope.co.uk/as-built/air-tightness-testing/birmingham/): Blower door testing across Birmingham, Solihull, Coventry, Wolverhampton and the West Midlands. - [Air Tightness Testing Bristol](https://buildenvelope.co.uk/as-built/air-tightness-testing/bristol/): Blower door testing in Bristol, Bath, South Gloucestershire and Somerset. - [Air Tightness Testing Gloucestershire](https://buildenvelope.co.uk/as-built/air-tightness-testing/gloucestershire/): Blower door testing in Cheltenham, Gloucester, Stroud, Tewkesbury and the Cotswolds. - [Air Tightness Testing Warwickshire](https://buildenvelope.co.uk/as-built/air-tightness-testing/warwickshire/): Blower door testing in Warwick, Leamington Spa, Stratford-upon-Avon, Rugby and Nuneaton. - [Sound Insulation Testing](https://buildenvelope.co.uk/as-built/sound-insulation-testing/): Airborne and impact sound insulation testing for separating walls and floors in new build and conversion dwellings under Part E. - [Sound Insulation Testing Worcestershire](https://buildenvelope.co.uk/as-built/sound-insulation-testing/worcestershire/): Airborne and impact testing in Worcester, Malvern, Droitwich, Evesham, Bromsgrove and Redditch. - [Sound Insulation Testing Birmingham](https://buildenvelope.co.uk/as-built/sound-insulation-testing/birmingham/): Airborne and impact testing across Birmingham, Solihull, Coventry, Wolverhampton and the West Midlands. - [Sound Insulation Testing Bristol](https://buildenvelope.co.uk/as-built/sound-insulation-testing/bristol/): Airborne and impact testing in Bristol, Bath, South Gloucestershire and Somerset. - [Sound Insulation Testing Gloucestershire](https://buildenvelope.co.uk/as-built/sound-insulation-testing/gloucestershire/): Airborne and impact testing in Cheltenham, Gloucester, Stroud, Tewkesbury and the Cotswolds. - [Sound Insulation Testing Warwickshire](https://buildenvelope.co.uk/as-built/sound-insulation-testing/warwickshire/): Airborne and impact testing in Warwick, Leamington Spa, Stratford-upon-Avon, Rugby and Nuneaton. - [Ventilation Flow Rate Testing](https://buildenvelope.co.uk/as-built/ventilation-flow-rate-testing/): On-site measurement and commissioning of MVHR, MEV, and intermittent extract ventilation systems under Part F. - [Smoke Shaft Testing](https://buildenvelope.co.uk/as-built/smoke-shaft-testing/): ATTMA Level 2 accredited smoke shaft air tightness testing and commissioning under BS 9991 and Approved Document B. - [Thermographic Surveys](https://buildenvelope.co.uk/as-built/thermographic-surveys/): Non-invasive infrared thermal imaging to identify heat loss, insulation defects, air leakage paths, thermal bridging, and moisture ingress. ### Client Portal & Part L Photo Evidence - [Part L Photo Evidence](https://buildenvelope.co.uk/part-l-photo-evidence/): Dedicated client portal for Part L photographic evidence compliance. Capture timestamped, geotagged construction photos from Android or iOS devices. Project tracking, document management, and certificate downloads included with every project. ## Hub Pages - [Design & Planning Services](https://buildenvelope.co.uk/design-planning/): Overview of all design stage compliance services. - [As Built & On-Site Testing](https://buildenvelope.co.uk/as-built/): Overview of all on-site testing and certification services. - [Contact](https://buildenvelope.co.uk/contact/): Contact form, office details, map, and service directory. ## Key Information ### Accreditations - OCDEA (On Construction Domestic Energy Assessor) — Registered EES/030713 - ATTMA (Air Tightness Testing and Measurement Association) — Accredited Testers - ATTMA Level 2 — Smoke Shaft Testing - Elmhurst — Approved Assessors - BPEC — Registered - SITMA — Member ### Service Areas - Birmingham and West Midlands (Birmingham, Solihull, Coventry, Wolverhampton) - Bristol and South West (Bristol, Bath, South Gloucestershire) - Worcestershire (Worcester, Malvern, Droitwich, Evesham, Bromsgrove, Redditch) - Gloucestershire (Cheltenham, Gloucester, Stroud, Tewkesbury, Cotswolds) - Oxfordshire (Oxford, Banbury, Bicester, Witney) - Wider England and Wales (all accreditations valid nationally) ### Building Regulations Covered - Part L: Conservation of fuel and power (energy efficiency) - Part E: Resistance to the passage of sound - Part F: Ventilation - Part G: Sanitation, hot water safety and water efficiency - Part O: Overheating - Approved Document B: Fire safety (smoke shaft testing) - BS 9991: Fire safety in residential buildings - BS EN ISO 6946: Thermal resistance of building components - BS EN ISO 10211: Thermal bridges in building construction ### Contact - Phone: 01386 365145 - Email: info@buildenvelope.co.uk - Office: Kingsway House, 40 Foregate Street, Worcester, WR1 1EE - Hours: Monday-Friday 8:00am-6:00pm, Saturday by appointment - Client Portal: https://portal.buildenvelope.co.uk