SuperQuilt multifoil insulation
A/A+ fire ratedA/A+ fire rated and around 40mm thick. For Harrow properties where deepening the rafters is impractical, this is what makes the numbers work.
North West London loft specialists
Loft insulation in Harrow
Roughly a quarter of an uninsulated home's heat escapes through the roof. For Harrow homeowners that is the cheapest problem in the house to fix, and the one most likely to have been fixed badly the first time. We do it properly.
Free survey in Harrow
Fixed written price
No call-out charge
Why it matters
The case for insulating your Harrow loft
25%of a home's heat is lost through an uninsulated roof
1 in 5UK lofts are under-insulated or have the wrong material
270mmthe depth current building regulations recommend
90%less radiant heat loss with SuperQuilt multifoil
Those figures are national, but the logic is entirely local: the roof over a Harrow house is the cheapest part of it to improve, and the part losing the most.
Harrow's homes
Older Harrow homes, modern standards
Harrow's housing stock largely dates from the 1890s through the 1930s, and the roofs above it are typically generous pitched roofs on the interwar stock, many with hipped ends and a central water tank. Very little of it was built with any insulation at all; what is there now was added later, and its condition depends entirely on who added it and when.
Retrofitted insulation ages in predictable ways. Mineral wool settles and compresses under its own weight over decades. Anything that has been walked on, stored on or boarded over is thinner than it was. Material that has been repeatedly damp has lost most of its value. And the very oldest loose-fill products are often best removed entirely rather than topped over.
A specific local factor: the interwar semis typically have large, square, walkable lofts — the best candidates in London for boarding as proper storage. We look for that on every Harrow survey.
Our services in Harrow
Five ways we keep Harrow homes warm
Every one of these begins with the same free survey and ends with a fixed price agreed before anything starts.
Loft insulation installation
270mm depthFull-depth mineral wool, fitted with the ventilation path protected and the hatch sealed — the details that decide whether a Harrow loft actually performs.
Loft boarding
Storage-readyTongue-and-groove panels, screwed rather than nailed so they lift again if a cable needs reaching — raised clear of the insulation throughout.
Loft ladders
Fitted in a dayFitted in a day, finished to match your landing, with the hatch insulated and draught-sealed as part of the same job.
Loft makeovers
All-in-oneFor Harrow homeowners who want the roof space to stop being a problem and start being storage: everything, in a day.
Not sure what your Harrow loft needs?
Describe the property and what is bothering you about it, and we will recommend the right combination — or tell you that nothing needs doing.
Where we work
Covering Harrow and the surrounding area
Working across North West London means Harrow rarely stands alone on the schedule — Harrow Weald and Barnet are all within the same round. If your address sits between them, ring and we will confirm.
In the loft
Loft work in and around Harrow
Examples of the work we carry out across the area — insulation, boarding, access and full makeovers.
Questions & answers
Harrow loft insulation — common questions
Will insulating my loft cause damp?
Correctly installed, no. The risk comes from packing material hard into the eaves and sealing off the airflow the roof depends on. We stop the insulation short and use eaves trays where the pitch requires them.
Do you offer free surveys in Harrow?
Free, with no call-out fee and no pressure. A meaningful proportion of our Harrow surveys conclude that the loft is already adequately insulated and the homeowner should keep their money — which is a perfectly normal outcome.
What insulation depth do you fit?
270mm of mineral wool, cross-laid — the depth current building regulations guidance points to for a cold loft. Where a Harrow property has a room in the roof and depth is constrained, we use 40mm multifoil at rafter level instead.
Can I still use my Harrow loft for storage afterwards?
Yes, provided the boarding is raised. Screwing boards straight onto 100mm joists over 270mm of wool compresses it to a third of its depth and throws away most of what you paid for. We fit raised boarding on battens so the insulation stays at full depth underneath.
Do I need planning permission in Harrow?
No. Loft insulation, boarding and loft ladders are all improvement works well outside planning control, in Harrow as everywhere else. A loft conversion — creating a habitable room with structural alterations — is different and normally needs building control approval. We do not carry out conversions.
How long does the work take in a typical Harrow home?
Half a day for insulation alone; a full day for a combined job with boarding, lighting and a ladder. Very large Harrow lofts or heavy strip-outs occasionally run into a second morning, and we tell you that in advance.
What homeowners say
Reviews from Harrow customers
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Worth reading before you book
How much does loft insulation cost in London? — one of our guides, written by the surveyors who assess lofts across Harrow and the rest of the capital every week. You can also browse all of our advice guides or read the general FAQ.
Written and fact-checked by the Loft Insulation London survey team, who assess loft spaces across the capital every working week. Last reviewed .
Ready for a warmer Harrow home?
Book a free, no-obligation survey of your Harrow loft and get a fixed price in writing before you decide anything.