Group B · Cavity and internal walls
Timber frame walls
Mineral wool or wood-fibre between the studs with a vapour control layer.
Priced after survey
Timber frame walls
Every job like this is different, so we measure first and give you a fixed written quote. The price depends on:
- The area and access
- What's there now and its condition
- The system and finish you choose
No obligation — your survey confirms what suits and what it costs.
- Best for
- Timber-framed homes and extensions
- Guarantee or standard
- Part L
- Time on site
- Cavity fill is usually done in a day for a typical house.
- Typical price
- Priced after survey
What it is
What is timber frame walls?
Mineral wool or wood-fibre between the studs with a vapour control layer.
Best for: Timber-framed homes and extensions.
Build-up
Timber frame wall
- 1Plasterboard
- 2Service void
- 3Vapour control layer
- 4Mineral wool or wood-fibre between studs
- 5Sheathing board
- 6Breather membrane and cladding
Who it suits
Which homes is timber frame walls suitable for?
Is my home suitable?
Pick your property type for a straight answer on timber frame walls.
Guidance only — every home is different, and a survey confirms what suits yours.
Houses
Flats and blocks of flats
Commercial and public buildings
Usually suitable Depends — a survey confirms
Not usually suitable for 7 property types
- Mews house and cottage — Solid masonry walls aren't timber-framed — internal or external wall insulation is the route.
- Period home — Solid masonry walls aren't timber-framed — internal or external wall insulation is the route.
- Listed building or conservation area — Solid masonry walls aren't timber-framed — internal or external wall insulation is the route.
- Farmhouse, barn conversion or rural home — Solid masonry walls aren't timber-framed — internal or external wall insulation is the route.
- Park and mobile home — Park and mobile homes need specialist systems, which we arrange through a partner rather than standard measures.
- Converted flat — Solid masonry walls aren't timber-framed — internal or external wall insulation is the route.
- Mansion block — Solid masonry walls aren't timber-framed — internal or external wall insulation is the route.
Materials and brands
What we use
Mineral wool or wood-fibre between studs with vapour control layer and service void.
Insulation brands we work with
- Knauf Insulation (Earthwool, Supafil blown)
- Rockwool
- Superglass
- Isover
- Kingspan
- Celotex
- Recticel
- Xtratherm
- Steico wood-fibre
- YBS and Actis multifoil
The exact system and brand for your home are confirmed in your written quote.
Heat, bills and EPC
What it does for your heat loss, bills and EPC
An empty cavity lets heat pass straight through the wall. Filling it lowers the wall's U-value considerably, so rooms hold their heat for longer and the heating runs less — often one of the best-value measures on an EPC for homes with unfilled cavities. Solid walls lose even more heat; lining them inside gives a similar improvement, room by room.
See the EPC points and savings for your home in the EPC plannerU-value before and after, typical heat and bill saving, and EPC points — worked out for your property.Price
How much does timber frame walls cost?
Priced after survey
Jobs like this vary too much for a fair online price, so we measure first and give you a fixed written quote — with no obligation.0% VAT on energy-saving materials
Insulation, solar panels, batteries and heat pumps installed in homes in Great Britain are zero-rated for VAT until 31 March 2027. Windows and doors are not included.What to expect
Time on site, disruption and approvals
Time on site
Cavity fill is usually done in a day for a typical house. Extraction and internal wall insulation take longer and are confirmed at survey.
Disruption
Cavity work is done from outside through small drilled holes, which are filled and colour-matched afterwards. Internal wall insulation means clearing the rooms being done.
Planning and building control
Cavity wall insulation must comply with Building Regulations and is certified through a competent person scheme or building control. Internal wall insulation doesn't need planning, but listed buildings need consent.
Guarantee and standard
Part L. The guarantee and certification for your job are confirmed in writing in your quote.
60-second grant check
Could a grant help pay for it?
Grant eligibility checker
About 60 seconds · plain results: likely, possibly or not eligible
Before we start
What type of property is it?
Questions
Timber frame walls: your questions answered
How are timber frame walls insulated?
Mineral wool or wood-fibre fills the gaps between the studs, with a vapour control layer on the warm side and a service void so cables don't puncture it.
Why is the vapour control layer important?
It stops warm, moist room air reaching the cold parts of the wall, where it could condense and wet the timber frame.
Can an existing timber-framed house be upgraded?
Often, from inside when rooms are being refurbished. We survey the frame and the existing insulation first.
Group B
More in cavity and internal walls
Cavity wall insulation
A borescope survey, then blown mineral wool or bonded bead injected into empty cavity walls.
Cavity wall extraction and refill
Failed, wet or slumped cavity insulation removed, wall ties checked, then refilled.
Cavity wall tie replacement
Replacing corroded wall ties, often found during cavity extraction.
Cavity survey only
Borescope and thermal imaging to show whether a wall is empty, part-filled or failed.
Party wall cavity insulation
Filling cavity party walls to stop hidden 'party wall bypass' heat loss.
Narrow and hard-to-treat cavities
Specialist bead or wool systems for narrow, stone-faced, exposed or high-rise cavities.
Begin your project
Ready to talk about timber frame walls?
Tell us about your home and we'll arrange a survey, then a fixed written quote — no obligation.