onCheckatrade
Cavity wall insulation specialists

Cavity wall insulation that pays for itself in warmth.

We install loft, cavity, external wall and underfloor insulation, and remove spray foam — quietly, cleanly, and to a standard we'd want in our own homes.

Trade-certified installers Eco-grade materials Surveyed before quoted
SJDJ Services insulation installation van

Request a free quote

Tell us about your property and we'll come back with tailored options. No obligation.

We respond by message only. Your details are used solely to prepare your quote.

What we install

Every property is different. Our surveyors recommend only what genuinely improves your home — never a one-size-fits-all package.

Loft insulation

Up to 25% of a home's heat is lost through the roof. Mineral wool or sheep's wool, fitted neatly with full draught-proofing.

Cavity wall insulation

Bonded bead or blown mineral fibre into the cavity — quick, clean and one of the most cost-effective upgrades you can make.

External wall insulation

A weatherproof render system that transforms solid-wall homes into modern, warm, low-energy properties.

Internal wall insulation

Slim, breathable boards installed room by room when external work isn't an option (listed buildings, conservation areas).

Underfloor insulation

Mineral wool or rigid board between joists — stops cold rising from the void and cuts draughts at skirting level.

Spray foam insulation removal

Safe removal of open-cell and closed-cell foam from roof voids and timber-framed buildings, surveyed and extracted to current standards.

Why homeowners choose us

A warmer, more comfortable home

Eliminate cold spots and draughts in every room.

Lower energy bills

Most homes recoup the install cost within a few heating seasons.

Lower carbon footprint

Less gas burnt, less heat wasted — a meaningful step toward net zero.

Trade-certified installers

Surveyors and fitters who specialise in local housing stock.

How it works

Step A

Tell us about your property

Send a short message via our quote form — postcode, property type, what you'd like done.

Step B

Free local survey

A surveyor visits, measures up and writes a clear, line-by-line recommendation.

Step C

Tidy installation

Our installers complete the work cleanly, with full sign-off and a written guarantee.

Find your area

We cover hundreds of towns and cities. Find yours and see what we can do for your home.

Browse areas we cover