SuperQuilt multifoil insulation
A/A+ fire ratedMultifoil earns its place in South Harrow roofs where depth is the binding constraint — period timbers, low headroom, or a conversion already boarded out.
North West London loft specialists
Loft insulation in South Harrow
Insulation is the one home improvement that starts paying you back on the next heating cycle rather than in a decade. We fit it across South Harrow — to full depth, with the eaves kept clear and the hatch sealed, which is where most jobs quietly go wrong.
Free survey in South Harrow
Fixed written price
No call-out charge
Why it matters
The case for insulating your South 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
None of this requires permissions, scaffolding or structural work. In South Harrow, as anywhere, it is a day's work with materials that cost little relative to what they save.
South Harrow's homes
South Harrow housing and the insulation problem
Like much of North West London, South Harrow is built largely of Victorian and Edwardian terraces close in, and mile after mile of interwar semi-detached and detached suburbia further out. Housing of that age has a particular relationship with heat: solid or early cavity walls, single-glazed openings replaced piecemeal over the years, and a roof void that was simply a void until somebody decided to put something in it.
The roof is where the largest single share of that heat goes, and it is also the cheapest part of the building to improve. There is no structural work, no planning permission, no scaffolding and no disruption beyond a day with the hatch open. For most South Harrow homeowners it is the first upgrade that makes clear financial sense and the last one they get round to.
The complication locally is that the interwar semis typically have large, square, walkable lofts — the best candidates in London for boarding as proper storage.
Our services in South Harrow
Five ways we keep South 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 depthThe standard job, done to standard: two layers, the second laid across the joists to kill the cold bridge, eaves left clear. Most South Harrow lofts are finished in half a day.
Loft boarding
Storage-readyStorage that does not flatten your insulation. We raise the deck on battens so the full depth survives underneath — the version most South Harrow lofts should have had first time.
Loft ladders
Fitted in a dayFixed, stable access instead of a stepladder on the landing. Timber, aluminium or concertina, chosen to suit the space your South Harrow home actually has.
Loft makeovers
All-in-oneOne team, one survey, one sequence of work. The insulation depth sets the batten height, the batten height sets the ladder landing — which is why doing it piecemeal costs more.
Not sure what your South 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 South Harrow and the surrounding area
If you are on the edge of South Harrow — closer to Harrow and Sudbury, perhaps — you are still inside our working area. The boundaries on this site are for navigation, not for pricing.
In the loft
Loft work in and around South Harrow
Examples of the work we carry out across the area — insulation, boarding, access and full makeovers.
Questions & answers
South Harrow loft insulation — common questions
Can I still use my South 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 you remove the old insulation?
Where it can stay, it stays and we top over it. Where it cannot, it goes and the disposal is included in the fixed price. You will never find out about removal costs mid-job — that is decided at survey.
Can you fit a loft ladder at the same time?
Certainly. Doing the ladder in the same visit means the boarding is planned around where the ladder lands, which is considerably better than retrofitting one to a deck that was not designed for it.
What homeowners say
Reviews from South Harrow customers
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Worth reading before you book
Loft insulation grants and funding — one of our guides, written by the surveyors who assess lofts across South 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 South Harrow home?
Tell us about your South Harrow loft and we will arrange a survey, usually within the same week.