Warmer home, lower bills — properly installed loft insulation
Around a quarter of home heat is lost through an uninsulated roof. New installs and top-up upgrades to current UK recommended depths, fitted by trained installers.
New installs and upgrades to current standards
If your loft has no insulation, or the existing insulation has been compressed or is well below the currently recommended 270mm depth, it's costing you real money every winter. A properly specified upgrade pays for itself and makes the whole house more comfortable.
We assess your loft, check ventilation and any existing insulation, then install new mineral wool or equivalent products to the recommended depth — leaving clear access to services and taking care around downlights, tanks and eaves.
Because loft insulation is one of the cheapest, quickest energy upgrades you can make, it's almost always the first improvement we'd recommend for a colder, draughtier home.
Why customers choose CornerStone
- New loft insulation installs
- Top-up upgrades to recommended depth
- Reduced heat loss and energy bills
- Improved year-round comfort
- Proper ventilation preserved
- Tidy, safe installation with clear walk-boards where needed
A complete loft insulation service under one roof
Everything you need for this area of your property, delivered by qualified specialists — with one point of contact from assessment through to sign-off.
New Installs
Full mineral wool installation to 270mm depth in previously uninsulated lofts — the single biggest efficiency upgrade for older homes.
Top-Up Upgrades
Adding depth over existing thin or compressed insulation to bring it up to current UK guidance.
Ventilation Checks
Confirming and correcting eaves ventilation and pipe insulation so upgraded lofts don't develop condensation.
Pipe & Tank Lagging
Cold-water tanks and pipework insulated to prevent winter freezing above a newly insulated ceiling.
Loft Hatch Insulation
Insulated, draught-sealed loft hatches — a small change that stops a major cold spot in the ceiling.
Storage Boarding
Raised loft-boarding legs so storage still works properly over the full insulation depth, without compressing it.
Installed properly — full depth, correct ventilation, tidy finish
A rushed insulation job crams the material against the eaves, blocks ventilation and creates condensation problems within a couple of winters. Ours doesn't.
We install to full recommended depth, keep eaves ventilation clear with proper baffles where needed, protect downlights and cabling, and leave you with clear walk-boards where you need them.
- Installed to 270mm depth
- Eaves ventilation preserved
- Downlight covers fitted
- Walk-boards where needed
Straightforward from first call to final walk-round
No pressure sales, no surprise costs. Here's exactly what to expect when you work with us.
- 01
Loft Assessment
We measure existing insulation, check ventilation, and confirm the specification and quantity needed.
- 02
Fixed Quote
Itemised written quote sent by email — usually within 24 hours of the survey.
- 03
One-Day Install
Most domestic lofts completed in a single day, with dust sheets protecting your home throughout.
- 04
Handover
Photos of the completed loft, guidance on storage, and workmanship guarantee issued.
The fastest-paying home improvement you can make
A quarter of heat lost
Around 25% of a home's heat escapes through an uninsulated roof — you're paying to warm your loft space and the sky above it.
Pays back quickly
For many homes, loft insulation pays for itself in reduced heating bills within just a few years — and keeps saving for decades after.
Every room feels warmer
Upstairs rooms in particular become more comfortable in winter and cooler in summer, without touching the heating.
Frequently asked questions
What depth of insulation do I need?+
Current UK guidance is around 270mm for mineral wool insulation. Many older homes have far less — our survey will measure what's actually there.
Will insulation cause condensation in my loft?+
Not when installed properly. Correct ventilation at the eaves and around any pipework is part of every install we do.
How long does installation take?+
Most domestic lofts can be insulated in a single day, with minimal disruption inside the home.
Can I still use my loft for storage?+
Yes — we can install raised loft-boarding legs that keep storage useable without squashing the insulation below.
What about downlights in the ceiling?+
We fit fire-rated downlight covers before insulating over them, so LEDs aren't smothered and there's no fire risk.
Will it help in summer as well as winter?+
Yes — insulation slows heat transfer in both directions, so upstairs rooms stay cooler on hot summer days too.
Ready to protect your property?
Get a free, no-obligation quote and we'll come and take a proper look — no pressure, no pushy sales.