Building Performance Diagnostics & Remediation — London
RetrofitIQ provides Building Performance Diagnostics & Remediation across Greater London — Investigate, Diagnose, Design, Remediate and Verify. From the solid-wall Victorian terraces of Hackney and Camden to the warehouse conversions of Wapping and the new-build estates of Stratford and Canary Wharf, we deliver measured, building-physics-led results.
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 London? Book a measured, evidence-based survey before any remedial spec.
Book a SurveyWhat we see, measure and remediate across London.
These are the recurring building-physics issues we diagnose across London. Every project still starts with measured data — but knowing the typical patterns helps focus the investigation.
- ▪Single-skin solid masonry walls with U-values around 2.0-2.2 W/m²K — typically 60-70% of the total heat-loss budget
- ▪Uninsulated concrete lintels driving cold band around every window
- ▪Suspended timber ground floors over uninsulated voids
- ▪Sash-window joinery with substantial frame leakage
- ▪Lofts with compressed or slumped insulation at the eaves
- ▪North-facing rooms and corners falling below dewpoint in winter
- ▪Single-glazed and early double-glazed bay windows with chronic surface condensation
- ▪Cold reveals and lintels driving localised mould around openings
- ▪Bathrooms and kitchens with insufficient mechanical extraction
- ▪Conversion flats above unheated ground floors — cold floors trap moisture
- ▪Original suspended timber floor perimeters leaking through skirting gaps
- ▪Service penetrations through external walls left unsealed
- ▪Loft hatches with no seal or insulation
- ▪Open chimney flues drawing warm air constantly
- ▪Sash-window and door perimeters with degraded weatherstripping
- ▪Sequenced fabric-first retrofit: air-sealing → insulation → controlled ventilation
- ▪EnerPHit-led whole-house design for the most demanding refurbishments
- ▪IWI with WUFI-modelled vapour control on Listed and conservation properties
- ▪Solid-wall EWI where planning permits
- ▪MVHR design and commissioning following blower-door verification
- 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 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 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