Loft Insulation
Top up or install fresh loft insulation to 270mm. The fastest, most cost-effective way to trap heat where it escapes most.
Learn more Bournemouth · Poole · Dorset
Stay Warmer, Spend Less. Bournemouth’s Trusted Insulation Experts.
Cut your energy bills by up to 35% and make every room feel cosier. Our certified local team fits loft, cavity wall, spray foam and external wall insulation across Dorset, with a friendly, no-mess installation.
- Certified installers
- 25-year guarantee
- Free no-obligation quote
- Family-run, local
Our Services
Insulation that pays for itself
Whether you live in a Victorian terrace in Poole or a new-build in Christchurch, we recommend the right solution for your home and install it properly.
Cavity Wall Insulation
Fill hollow walls with certified beads or fibre. Warmer rooms, less condensation, and lower bills all winter long.
Learn moreSpray Foam Insulation
Seal every gap in awkward roof spaces with high-performance closed-cell spray foam for maximum thermal efficiency.
Learn moreExternal Wall Insulation
Wrap solid-wall homes in an insulated render system. Dramatically warmer inside, refreshed kerb appeal outside.
Learn moreSee the Difference
Thermal imaging: before & after
Drag the slider to reveal how much heat your home loses without proper insulation, and how dramatically it changes after a Thermex install.
AFTERBEFOREWhy Choose Thermex
The reliable local team homeowners recommend
We’re not a call centre. When you ring Thermex you speak to a Dorset-based installer who’ll walk through your home with you.
Certified Installers
TrustMark & PAS 2030 accredited teams. All work signed off to industry standard.
25-Year Guarantee
Independently insured guarantee on every install for total peace of mind.
Free, No-Obligation Quotes
Honest advice and a fixed written price after a free home survey.
Grant Scheme Eligibility
We help you check ECO4 & Great British Insulation Scheme funding.
Local & Family-Run
Based in Bournemouth, serving Dorset neighbours for over 15 years.
Most Jobs in a Day
Tidy, respectful installers who protect your home from start to finish.
Reviews
Rated Excellent on Trustpilot
Over 300+ five-star reviews from homeowners across Dorset.
4.9 / 5
on Trustpilot · 312 reviews
“Our lounge used to feel draughty every winter. Six months after Thermex fitted cavity wall insulation, we’ve knocked £38 a month off our gas bill. Faultless service.”
“Booked a free survey and had a written quote the same week. The install team were polite, tidy and finished the loft in a single morning. Highly recommend.”
“They helped us apply for the ECO4 grant which covered most of the cost. The house is genuinely warmer upstairs now. Lovely local company.”
Gallery
Recent jobs across Dorset
A small selection of work we’ve completed in the last few months.
Service Area
Proudly local. Covering all of Dorset.
Based in Bournemouth, we install insulation across BH postcodes and the surrounding towns and villages. Not sure if we cover you? Give us a ring.
- Bournemouth
- Poole
- Christchurch
- Ferndown
- Wimborne Minster
- Ringwood
- Verwood
- New Milton
- Wareham
- Swanage
- Blandford Forum
- Corfe Mullen
Thermex HQ
Bournemouth, Dorset
FAQ
Questions homeowners ask us
Get a Free Quote
Start saving on your energy bills
Tell us a little about your home and we’ll be in touch within one working day to arrange your free survey.