SuperQuilt multifoil insulation
A/A+ fire ratedA/A+ fire rated and around 40mm thick. For Merton properties where deepening the rafters is impractical, this is what makes the numbers work.
South West London loft specialists
Loft insulation in Merton
Whether you are in a period terrace, an interwar semi or something considerably more recent, we specify insulation for the roof it is actually going into. Merton homes get a free survey, a fixed price and work carried out to current recommended standards.
Free survey in Merton
Fixed written price
No call-out charge
Why it matters
The case for insulating your Merton 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
Which is why a free survey is worth half an hour of your time — the measurement itself usually settles whether a Merton loft is worth spending anything on.
Merton's homes
Merton housing and the insulation problem
Like much of South West London, Merton is built largely of substantial Victorian and Edwardian houses, interwar semis and detached homes, and a large number of period conversions. 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 Merton homeowners it is the first upgrade that makes clear financial sense and the last one they get round to.
The complication locally is that a high proportion of lofts here have already been converted or partly converted, which moves the insulation from the floor to the rafters.
Our services in Merton
Five ways we keep Merton 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 Merton lofts are finished in half a day.
Loft boarding
Storage-readyBoards laid straight onto joists crush 270mm into 100mm. We batten out instead, so Merton homeowners get usable storage and keep the insulation they paid for.
Loft ladders
Fitted in a dayThe thing that turns a loft you avoid into one you use. Grab rails and a boarded landing area where the design allows.
Loft makeovers
All-in-oneInsulation, boarding, lighting and a ladder handled together in one visit — cheaper and better sequenced than buying the four separately.
Not sure what your Merton 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 Merton and the surrounding area
If you are on the edge of Merton — closer to Mitcham and Wandsworth, 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 Merton
Examples of the work we carry out across the area — insulation, boarding, access and full makeovers.
Questions & answers
Merton loft insulation — common questions
What insulation depth do you fit?
The recommended 270mm, achieved in two layers: the first between the joists, the second laid across them to eliminate the cold bridge through the timber. Skipping that second cross-lay is one of the most common shortcuts in the trade.
Do I need planning permission in Merton?
No. Loft insulation, boarding and loft ladders are all improvement works well outside planning control, in Merton 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 much does loft insulation cost in Merton?
We price Merton jobs after a free survey, itemised so you can see what the insulation, any boarding and any removal each cost. There is no call-out charge and the figure does not move once it is written. The London cost guide explains what drives it.
What happens to the water tank and pipes?
They end up above the new insulation line, in a colder space than before, so they must be lagged. The cold water tank is insulated on its sides and lid but never underneath — the warmth rising from the house is what keeps it from freezing. We handle this as part of the job.
Will this improve my EPC rating?
Very likely. Without documentation an assessor will often default to a pessimistic assumption about what is in the loft, so we make sure you have the paperwork to show them.
Will insulating my loft cause damp?
It can if the ventilation is ignored, which is why we check it before anything comes off the van. If we find an existing condensation problem in a Merton loft, we deal with the cause first rather than insulating over it.
What homeowners say
Reviews from Merton 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 Merton 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 Merton home?
We will look at your Merton loft, measure what is there and tell you honestly whether it needs work. No charge either way.