Retro-Check

Lambert Home Builds — Client Due-Diligence Tool

Retro-Check

A retrofit and energy-efficiency specific vetting scorecard — for insulation, heat pumps, solar, and whole-house upgrades. Covers the checks general building work doesn’t need, but retrofit does.

0% 0 / 0 pts
RED — high risk
How this works: tick every item you’ve confirmed with the retrofit installer or coordinator. The bubble on the level above slides right as your score rises, telling you at a glance whether this contractor is solid, worth a closer look, or risky for retrofit work specifically. Nothing here is saved once you close the page, so finish in one sitting or note your answers down.
Why this matters: retrofit work carries risks general building work doesn’t — trapped moisture, condensation, and poor ventilation from a badly specified insulation job can damage a home in ways that aren’t visible for months. Government schemes have had real failures: a live consultation on Reforming Consumer Protection for Home Upgrade Schemes, closing 10 September 2026, exists specifically because of quality failings under ECO4 and the Great British Insulation Scheme. Retro-Check gives you a way to check for the same weaknesses now.
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Retro-Check is an independent tool, not an official accreditation, TrustMark, MCS, or government scheme registration. Completing this scorecard doesn’t certify or guarantee an installer’s work — it’s a structured way to organise your own due diligence for retrofit and energy-efficiency projects specifically.

Relevant to the Warm Homes Plan consumer protection reform

Why retrofit needs its own checks

The government’s own consultation identifies the gaps Retro-Check is designed to catch — before a single oversight service and public installer register are in place to catch them for you.

01

Retrofit Coordination (PAS 2035)

Covered by PAS 2035 & Retrofit Coordination — was a Retrofit Coordinator and Assessor involved, not just an installer working measure-by-measure.

02

Scheme & Scheme-Body Registration

Covered by TrustMark & MCS Registration and Government Scheme Registration — the two frameworks the consultation proposes folding into a single oversight service.

03

Whole-House Risk

Covered by Whole-House & Ventilation Risk Assessment — the exact failure point behind reported issues with external wall insulation under ECO4 and GBIS.

04

Redress if it Goes Wrong

Covered by Installation Guarantees and Official Complaints & Dispute History — so there’s a route to a fix if the installer can’t or won’t put it right.

Company registration, VAT, credit history and general professionalism checks carry over from Build-Check, so nothing on the financial and conduct side is lost by using the retrofit-specific version.

Score breakdown

Retro-Check is an independent tool created by Lambert Home Builds. It is not an official accreditation, certification, TrustMark, MCS, or government scheme registration, and a high score is not a guarantee of an installer’s quality or conduct. It gives a general risk indication only, is not financial or legal advice, and is intended to support — not replace — your own due diligence appropriate to your project’s size and value. Informed by proposals in the government’s Reforming Consumer Protection for Home Upgrade Schemes consultation.

Copyright © 2020-2026 – Lambert Home Builds is a trading name of Lambert Design and Build Ltd – Registered address: 47 Robsart Place, Cumnor, Oxford OX2 9QT. Company reg. no.: 10906208 – VAT GB290351512.
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