The Insulation Company helps homeowners arrange loft-insulation assessments, quotations and installation services across the UK.
London · England
South London runs from the dense Victorian terraces of Clapham, Balham and Peckham through the leafier interwar suburbs of Dulwich, Streatham and Wimbledon out to the post-war estates and green edges toward Croydon and Bromley. Lofts here have often been altered — boarded, part-converted or insulated years ago to standards well below today's — so the practical starting point is always what is genuinely in the roof now rather than any general rule.
We help homeowners across south London — the SE and SW postcode areas — arrange loft assessments, quotations and installation. Depending on the service, work may be completed by The Insulation Company or an approved installation partner.
The period terraces around Clapham, Brixton, Peckham and Tooting frequently have compact lofts with steep, awkward access and original insulation that has settled over decades, and many have been part-boarded in a way that compresses the wool. The interwar semis of Dulwich, Streatham and Wimbledon typically carry thin original material well suited to a top-up, often with boards laid straight onto the joists. Post-war and ex-local-authority housing toward the southern edge varies widely and is best judged house by house. Conversions and flats raise the question of who is responsible for the roof space, which we help you think through before any work.
South London's older terraces were not built around modern ventilation detailing, so blocking the eaves with insulation can cause condensation. We keep the eaves clear and consider airflow alongside insulation. In converted or part-converted lofts — common across the inner suburbs — we check whether the job is a loft floor to insulate at joist level or a room-in-roof needing a different, rafter-level approach.
Condensation is a frequent complaint in poorly ventilated south-London lofts, particularly in flats and older terraces where an extractor has been run into the roof space. We identify the cause before recommending work rather than assuming insulation alone will resolve it.
Across south London, access on terraced streets, parking, the state of any existing insulation and removal of old or contaminated material drive cost more than location alone. Any boarding or ventilation work also affects the quotation.
You tell us about your property and what you have noticed in the loft. Nothing is committed at this stage.
We review the property age, roof type, loft access and any existing insulation, moisture or ventilation concerns.
Where required, a survey or assessment is arranged so measurements and conditions can be checked in person.
You receive a clear written recommendation and quotation setting out the scope, materials, price and any guarantee.
Work is completed by The Insulation Company or an approved installation partner, with access protected throughout.
Final checks are carried out, the loft is left clean, and relevant documentation and any guarantee are supplied.
These are examples of our work elsewhere, shown to illustrate what a project involves. They did not necessarily take place in South London.
Emma's front and rear bedrooms, split by a central chimney breast, both cooled quickly. We insulated the 40m² floor on both sides of the chimney to a full 300mm depth.
Example from our project library
Tom noticed condensation on the bedroom windows and rapid overnight heat loss. We gave his compact 31m² loft a full 300mm Knauf glass mineral wool layer, fitted carefully around the hatch and low edge bays.
Example from our project library
Peter's upstairs ran consistently colder than the ground floor even after a heating service. The 46m² loft was almost completely uninsulated, so we installed a full 300mm Knauf glass mineral wool layer from hatch to gable.
Example from our project library
We help homeowners across the SE and SW postcode areas — from Clapham, Brixton, Peckham and Tooting to Dulwich, Streatham, Wimbledon and out toward Croydon, Bromley and Sutton. Request an assessment and we'll confirm coverage for your postcode.
Boards laid straight onto the joists usually compress the insulation beneath and reduce its performance. We can lift them and reinstate storage on a raised boarding system so the build-up is preserved.
A converted or part-converted loft needs insulation at rafter level rather than across the floor, which is a different job from a standard loft-floor installation. We assess which applies before recommending an approach.
Customer feedback
Feedback from customers who have used our insulation services.
Lovely crew. They arrived on time and gave me an excellent quote. A friendly group of workers who kept me updated throughout the process.
Quick, professional and great communication. Very happy with the service.
I’d highly recommend this company to anyone considering loft insulation. The team were reliable, friendly and gave…
Had my loft insulation done recently and honestly couldn’t be happier. The whole process was super smooth from start to…
Great service from start to finish. The team were friendly, professional and completed the work to a high standard…
Really happy with the service. The team were friendly, turned up on time and got the job done with no fuss. Everything was left clean and tidy, and we can already feel the difference.
