Re-rendering, repairs and upkeep

EWI repairs and maintenance

EWI repairs fix damage to external wall insulation systems — impact holes, cracked base coat, failed sealants, water getting in at cills or pipes, and pecked or split render — using compatible materials so the insulation behind stays dry.

Impact damage cut back and repaired with mesh
Cracks investigated for movement or failed fixings
Sealants renewed at windows, pipes and penetrations
Water ingress traced at cills, copings and eaves
Bird and woodpecker damage repaired
Colour-matched finish or elevation recoat

Get a guide price See prices

A damaged corner of external wall insulation showing broken render, mesh and grey insulation board

Free survey for EWI repairs

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How is damaged EWI repaired?

The damaged area is cut back to sound render and board. Wet or crushed insulation is replaced, a new base coat with overlapping mesh is applied, then primer and a matching finish. The repair overlaps the existing mesh so it's reinforced like the original.

Typical build-up

Typical faults: Impact, cracking, sealant failure, water ingress
Repair method: Cut back, replace board if wet, mesh overlap, finish
Materials: Compatible with the existing system
Inspection: Detail-by-detail check
Guarantees: Check existing guarantee terms first

What causes EWI to fail?

Most problems start at details: cills that are too short or not sealed, unsealed pipe penetrations, missing drip beads, ground levels too close to the base track, or impact at low level. Where a defect is widespread, we report the likely cause before quoting.

Do you repair systems you didn't install?

Yes. We identify the system type where possible and use compatible materials. If your system is under a manufacturer's or installer's guarantee, check its terms before any third party works on it.

EWI repairs and maintenance prices

EWI repairs and maintenance guide prices
Item	Guide price	Notes
Small EWI repairs, single visit	From £540inc VAT	Ground-floor access
Larger areas	£102–£180 per m²inc VAT	Excluding scaffold
Condition report	From £295inc VAT	Written report with photos

Guide prices are confirmed by a fixed written quote after a free survey. Prices include VAT at 20%.

How it works

Tell us about the property
Use the quote tool or form, or call free on 0800 088 6248.
Free survey
We measure the walls, check condition and confirm planning and building control.
Fixed written quote
The system, details, access, exclusions and VAT, in writing. Anything hidden is priced and agreed before extra work.
Installation and handover
Work planned around the weather, then inspected and documented.

EWI repairs and maintenance: questions

Can damaged EWI be patched?

Yes, provided the board behind is dry and sound. Wet or crushed board is cut out and replaced.

Why is my EWI cracking?

Common causes are missing movement joints, poor mesh overlap, fixing problems or movement in the wall. We look for the cause rather than filling the crack.

Will the repair be visible?

Usually slightly, because the existing finish has weathered. A recoat of the elevation evens it out.

My EWI was installed under a grant — who repairs it?

First check the guarantee paperwork and contact the original installer or guarantee provider. If that route isn't available, we can quote.

Reviewed 19 October 2026 by the Render and Insulation technical team.