South London Building Performance Diagnostics — SE, SW, CR, BR
Across South London we work on everything from the bay-windowed Victorian terraces of Clapham and Battersea through the Edwardian housing of Dulwich and Forest Hill to the modern apartments of Bermondsey and Bankside. The common thread is solid-wall construction and lightweight conversion flats needing a measured, building-science-led retrofit approach.
Diagnostics-led building performance, delivered locally.
Every survey starts with measurement — FLIR thermal imaging, blower door testing, moisture mapping and surface temperature readings. The findings drive the spec, not the other way round.
- Home Health Diagnostic Survey
- Thermal Imaging Survey
- Blower Door / Airtightness Testing
- Damp, Moisture & Condensation Investigation
- Internal / Loft / Underfloor Insulation Retrofit
- Soundproofing & Acoustic Upgrades
Considering work in South London? Book a measured, evidence-based survey before any remedial spec.
Book a SurveyWhat we see, measure and remediate across South London.
These are the recurring building-physics issues we diagnose across South London. Every project still starts with measured data — but knowing the typical patterns helps focus the investigation.
- ▪Victorian terrace party walls in Clapham, Brixton, Camberwell and Peckham with no cavity to insulate
- ▪Wandsworth / Battersea conversion flats with cold ground-floor suspended timber decks
- ▪Dulwich / Forest Hill Edwardian semis with single-storey rear extensions over uninsulated voids
- ▪Croydon and Bromley inter-war semis with original cavity-fill that has degraded
- ▪Bermondsey / Bankside post-war estates with thermal-bridge cold bands at every floor slab
- ▪North-facing bedrooms in Brixton, Streatham and Tooting bay-window Victorian terraces
- ▪Bathroom and kitchen mould in Wimbledon and Earlsfield conversion flats
- ▪Cold-corner mould in 1960s council blocks across Lewisham and Southwark
- ▪Original-glazing condensation in Dulwich / East Dulwich heritage properties
- ▪Suspended floor perimeters in SW4, SW8, SW11, SE5 Victorian terraces
- ▪Loft hatches and party-wall junctions in Croydon / Sutton 1930s semis
- ▪Service penetrations in Bermondsey / Greenwich new-build apartments (documented post-occupancy drift)
- ▪Roof-to-wall junctions in Dulwich Edwardian houses
- ▪Whole-house EnerPHit retrofit on Clapham / Battersea Victorian terraces
- ▪Underfloor insulation programmes for SW4, SW11, SE15 suspended floors
- ▪IWI design + WUFI modelling for Dulwich / Forest Hill Edwardian properties
- ▪Independent retrofit review for Bermondsey and Greenwich new-build apartment blocks
- ▪EWI on Croydon and Bromley suburban semis where planning permits
Areas served: Greenwich · Lewisham · Croydon · Bromley · Lambeth · Southwark · Wandsworth · Wimbledon · Dulwich · Peckham · Brixton · Clapham.
- Thermal Imaging in South London
- Blower Door / Airtightness Testing in South London
- Damp, Condensation & Mould Diagnostics in South London
- Soundproofing & Acoustic Diagnostics in South London
- Internal Wall Insulation & Retrofit in South London
- MVHR & Ventilation in South London
- Indoor Air Quality in South London
- What is Passive House? The complete UK guide.
- The five Passive House principles, explained.
- Thermal-bridge-free design — the physics of cold spots.
- High-performance windows — U-values, glazing and comfort.
- MVHR explained — mechanical ventilation with heat recovery.
- PHPP explained — how Passive House energy is calculated.
Real completed Retrofit IQ investigations from South London and across Greater London — full diagnostic methodology, measurements taken, findings and outcomes.
Investigate → Diagnose → Design → Remediate → Verify
RetrofitIQ is not only a diagnostics company. We take projects in South London from first investigation through to verified improvement — and you decide how far we go. Engage us for an investigation on its own, an investigation plus targeted remedial works, or a complete building-performance and retrofit project.
A measured diagnosis — thermal imaging, blower door testing, moisture and building-physics analysis — with a clear, costed report you can act on however you choose.
We investigate, then carry out targeted remedial works — airtightness, insulation, ventilation or thermal-bridge corrections — and verify the result.
A full fabric-first, Passive House-informed retrofit from diagnosis through design, installation and verification — one accountable team, one point of responsibility.
- Airtightness improvements & draught-proofing
- Internal wall insulation (IWI)
- External wall insulation (EWI)
- Loft & roof insulation
- Suspended floor & underfloor insulation
- Thermal-bridge detailing & correction
- Extract ventilation & MVHR installation
- Soundproofing & acoustic upgrades
- General building-fabric improvements
Detailed local pages across South London.
Building stock, common problems and services town by town — thermal imaging, damp and condensation investigations, airtightness testing and retrofit advice tailored to each area.