Wood fibre EWI · Hertfordshire
Wood fibre insulation for older homes in Harpenden
If you're planning wood fibre external wall insulation in Harpenden, start with a free survey: we measure, check the walls and confirm planning and building control for your address. For older stone and early brick properties in Harpenden, we look at a wood fibre and lime build-up first.
- Free survey in AL5 and nearby
- Guide price from £150 per m² + scaffold, 0% VAT
- Fixed written price before work starts
Free survey in Harpenden
Postcode, service and a phone number is all we need.
What the job covers
- Made from a renewable material with low embodied carbon
- High density gives good protection from summer heat
- Vapour-open and hygroscopic — buffers moisture rather than trapping it
- Thicker than foam for the same U-value
Homes and walls in Harpenden
As well as Harpenden itself, we quote in St Albans, Luton and Hemel Hempstead. Harpenden sits around 11 miles from Watford. The East of England has a mix of post-war estates, inter-war semis and older solid brick and flint cottages, with some system-built council homes on post-war estates.
Much of Hertfordshire sits in the lower wind-driven rain exposure bands, which keeps the choice of finishes wide — though hilltop, coastal and exposed gable walls can still need a tougher specification, so we check the actual site.
For period homes in Harpenden, the survey looks closely at existing lime mortars and any cement patching that may trap moisture.
- Postcode district
- AL5
- County or area
- Hertfordshire
- Nation
- England
- Nearby
- St Albans, Luton, Hemel Hempstead, Welwyn Garden City
Planning and building control in England
Planning in Harpenden follows England's national rules: similar-looking finishes on houses are usually permitted, while flats, commercial premises, conservation areas and streets under an Article 4 direction need an application.
If the work covers more than half of a wall, or a quarter of the building's whole envelope, it counts as renovating a thermal element, with a target of about 0.30 W/m²K where feasible.
What finish goes over wood fibre?
A lime-based or mineral render designed for the system, applied over a reinforcing base coat. Lime finishes give the softer, slightly irregular texture that suits cottages and older terraces.
Wood fibre insulation for older homes prices in Harpenden
| Item | Guide price | Notes |
|---|---|---|
| Wood fibre + lime render system | £150–£210 per m²0% VAT | Excluding scaffold |
| Cottage, about 90 m² of wall | £15,300–£22,1000% VAT | Including scaffold |
| Lime render only (no insulation) | £78–£132 per m²inc VAT | See lime render |
Confirmed by a fixed written quote after survey. 0% VAT: installing insulation in a home is zero-rated until 31 March 2027, so these figures are the total; 5% applies from 1 April 2027. Prices include VAT at 20%.
How it works
Get a guide price
Try the online quote tool for a ballpark figure.
Book the survey
A visit at a time that suits you.
Agree the quote
Nothing starts until you've signed the written price.
We do the work
Planned around weather, with you kept informed.
Wood fibre EWI in Harpenden: questions
Is wood fibre insulation fireproof?
No — it's a timber product. It chars rather than flaming readily, but it is combustible, so it's used on low-rise buildings within a tested system and never where non-combustible materials are required.
Does wood fibre need a lime render?
It needs the render specified by the system manufacturer, which is usually lime or mineral based.
Is wood fibre worth the extra cost?
On older solid walls the main benefit is moisture safety rather than raw U-value. If the wall needs to breathe, the cheaper option can cost more later.
Do you cover Harpenden?
Yes — we survey and quote wood fibre external wall insulation in Harpenden (AL5) and nearby St Albans, Luton and Hemel Hempstead, with a fixed written price before any work starts.