Group B · Cavity and internal walls
Cavity wall tie replacement
Replacing corroded wall ties, often found during cavity extraction.
Priced after survey
Cavity wall tie replacement
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
- Pre-1980s cavity walls
- Guarantee or standard
- Structural report
- Time on site
- Usually a few days for a typical house.
- Typical price
- Priced after survey
What it is
What is cavity wall tie replacement?
Replacing corroded wall ties, often found during cavity extraction.
Best for: Pre-1980s cavity walls.
Who it suits
Which homes is cavity wall tie replacement suitable for?
Is my home suitable?
Pick your property type for a straight answer on cavity wall tie replacement.
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 9 property types
- Mews house and cottage — Homes of this type usually have solid walls with no cavity to fill. Internal or external wall insulation is the route.
- Period home — Homes of this type usually have solid walls with no cavity to fill. Internal or external wall insulation is the route.
- Non-traditional / system-built — Most system-built homes (concrete panels, no-fines concrete, steel or timber frame) have no conventional cavity to fill. EWI is often the only route.
- Listed building or conservation area — Homes of this type usually have solid walls with no cavity to fill. Internal or external wall insulation is the route.
- Farmhouse, barn conversion or rural home — Homes of this type usually have solid walls with no cavity to fill. Internal or external wall insulation is the route.
- New build or self-build — New homes are built with insulated cavities, so there's nothing to fill.
- Park and mobile home — Park and mobile homes need specialist systems, which we arrange through a partner rather than standard measures.
- Converted flat — Homes of this type usually have solid walls with no cavity to fill. Internal or external wall insulation is the route.
- Mansion block — Homes of this type usually have solid walls with no cavity to fill. Internal or external wall insulation is the route.
Materials and brands
What we use
Replace corroded wall ties, often found during cavity extraction.
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 cavity wall tie replacement 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
Usually a few days for a typical house.
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
A structural report sets the specification, and new ties are installed to it.
Guarantee and standard
Structural report. 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
Cavity wall tie replacement: your questions answered
What are wall ties?
Metal ties that hold the inner and outer leaves of a cavity wall together. In older homes they can corrode, expand and crack the mortar joints.
How do I know if my wall ties are failing?
Horizontal cracks in mortar joints at regular intervals, bulging brickwork, or a borescope finding corroded ties. A structural report confirms it.
Can wall ties be replaced without rebuilding the wall?
Yes — remedial ties are fixed through the outer leaf into the inner leaf, and the old ties isolated or removed as the structural report specifies.
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 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.
Internal wall insulation (IWI)
Insulated plasterboard or stud systems fitted inside solid walls where the outside must not change.
Begin your project
Ready to talk about cavity wall tie replacement?
Tell us about your home and we'll arrange a survey, then a fixed written quote — no obligation.