Most semi-detached homes lose up to 35% of their heat straight through uninsulated cavity walls. One day's work stops that — and the savings start immediately.
Cavity wall insulation isn't just about saving money — though the savings are real. Here is everything that improves from the day the work is done.
Stop paying to heat the outdoors. Insulated walls keep warmth inside — and money in your pocket from the very first heating season.
No more cold walls, cold spots, or rooms that just won't warm up. Your home reaches temperature faster and stays there longer.
Energy-efficient homes attract higher sale prices and move faster on the market. A certified installation is a permanent, verifiable improvement.
Every installation is certified under PAS 2035 and backed by a 25-year guarantee. Fully documented and transferable if you sell.
The average installation saves over 560kg of CO₂ per year. A meaningful environmental contribution that costs you nothing extra.
Cavity wall insulation works both ways. It keeps heat out in summer as well — so your home stays comfortable all year, not just in winter.
Semi-detached houses built between the 1930s and 1990s are among the most common properties we insulate — and among those that benefit most. Here's why.
A typical semi-detached has two exposed external walls — the front and back, plus the side gable. That's a significant amount of uninsulated surface area losing heat every hour your heating is on.
Insulating the cavity walls of a semi reduces that heat loss by up to 35% — which translates directly into lower bills and a noticeably warmer home from day one.
Our free survey confirms suitability — no obligation to proceed if your home isn't suitable. We'll always give you an honest answer.
Book My Free Survey → 📞 Call 01234 567 890Most semi-detached homes built between 1930 and 1995 qualify. Here are the most common indicators — our free survey will confirm before any commitment is needed.
From first enquiry to a warmer, certified home — here is exactly what happens at each stage.
Fill in the quick form or give us a call. We only need a few details to get started.
⏱ 60 secondsFirst Choice Energy Ltd will call you within 24 hours to discuss your property and arrange your free survey.
⏱ Within 24 hoursA certified surveyor visits your home, checks your walls, and confirms suitability. No obligation to proceed.
⏱ Around 30 minsThe team works entirely from outside. Small holes, insulation injected, holes sealed. You barely know they were there.
⏱ Most homes: 1 dayYou receive your PAS 2035 certificate and 25-year guarantee on the day. Your home is warmer from that evening.
⏱ Guaranteed 25 yearsFree, no obligation. You'll hear back within 24 hours.
Genuine feedback from homeowners whose properties were insulated through CavityTherm UK by First Choice Energy Ltd.
"Our house always felt cold in the winter no matter how much we had the heating on. After getting cavity wall insulation installed, the difference was really noticeable. The walls don't feel cold anymore and the house warms up much quicker. We're already seeing lower heating usage and the whole place just feels more comfortable."
"We decided to have cavity wall insulation installed after hearing it could help reduce energy bills. The process was quicker than we expected and there was very little disruption. Since having it done, the house keeps heat much better and we've definitely noticed a drop in how often the heating needs to be on."
"Our property is an older house and some rooms were always colder than others. After installing cavity wall insulation, the temperature feels much more even throughout the house. It's made a big difference to comfort, especially during colder evenings."
Get a free quote or call us now. You'll hear back within 24 hours.