Loft and cavity wall insulation · England
Loft and cavity wall insulation in London
Loft top-ups and cavity fill are the cheapest fabric measures for most homes in London, provided the survey comes first.
We take on loft and cavity wall insulation for social landlords across London: housing associations, councils, ALMOs and supported housing providers in all 33 council areas, to the rules that apply in England.
Where in London do we carry out loft and cavity wall insulation?
We cover every council area in London. Choose one to see who owns the social homes there and the local guide price.
- Barking and Dagenham
- Barnet
- Bexley
- Brent
- Bromley
- Camden
- City of London
- Croydon
- Ealing
- Enfield
- Greenwich
- Hackney
- Hammersmith and Fulham
- Haringey
- Harrow
- Havering
- Hillingdon
- Hounslow
- Islington
- Kensington and Chelsea
- Kingston upon Thames
- Lambeth
- Lewisham
- Merton
- Newham
- Redbridge
- Richmond upon Thames
- Southwark
- Sutton
- Tower Hamlets
- Waltham Forest
- Wandsworth
- Westminster
What is included?
- Cavity wall insulation injection
- Extraction of failed or unsuitable cavity fill
- Loft insulation top-ups to current recommended depths
- Loft ventilation checks and remedial vents
- Pipe and tank insulation
Which rules apply in London?
PAS 2035:2023 sets the whole-house retrofit process (assessment, coordination, design, installation and evaluation), and PAS 2030:2023 covers installation. Most government-backed retrofit schemes require both, with TrustMark lodgement. We confirm in writing, before appointment, how each measure in your scope will meet those requirements.
What does it cost in London?
Our guide range for cavity wall insulation in London is £1,150–£3,300 per home. That is the UK range of £950–£2,700 (published figure) adjusted by a regional cost factor of 1.22 (VOA Rating Cost Guide 2026: inner London 1.17–1.32, outer London 1.08–1.26); figures are before VAT where the source states it. Every job is priced after survey; specification, access and the condition of the homes will move the figure.
How do we deliver it?
Where we extract failed fill, we inspect the wall ties and the cavity while it is open and report what we find.
Common questions
Which council areas in London do you cover for loft and cavity wall insulation?
All 33: Barking and Dagenham, Barnet, Bexley, Brent, Bromley, Camden, City of London, Croydon, Ealing, Enfield, Greenwich, Hackney, Hammersmith and Fulham, Haringey, Harrow, Havering, Hillingdon, Hounslow, Islington, Kensington and Chelsea, Kingston upon Thames, Lambeth, Lewisham, Merton, Newham, Redbridge, Richmond upon Thames, Southwark, Sutton, Tower Hamlets, Waltham Forest, Wandsworth, Westminster.
Is every cavity wall suitable for fill?
No. Exposure to driving rain, narrow or obstructed cavities and poor wall condition can make fill unsuitable. That is why we survey first.
Will loft insulation cause condensation?
Not if the loft remains ventilated. We check eaves and ridge ventilation before laying insulation.