Existing insulation and guarantee check for Potters Bar properties
We cover Potters Bar and the EN6 postcode district, including nearby Borehamwood, Hatfield and Cheshunt. It is around 7 miles south-east of St Albans.
Buyers and sellers in Potters Bar often book this check when a survey report or EPC raises questions about the walls. Where a Potters Bar wall shows cold patches or damp, the survey targets those areas first rather than sampling at random.
Local weather affects which walls can be filled. Much of Hertfordshire sits in the more sheltered driving-rain zones of the UK, which widens the choice of fill. Exposed elevations, coastal sites and high ground still get checked wall by wall.
On compliance, if cavity wall insulation follows in Potters Bar, filling a cavity is notifiable building work and needs a building notice or competent-person self-certification.
Rules in England
Filling a cavity is notifiable building work and needs a building notice or competent-person self-certification if insulation work follows.
Sources: Planning Portal: cavity wall insulation and building regulations; CIGA: CWISC competent person scheme.
How to tell if a house already has cavity insulation
Look for a regular pattern of small patched holes in the mortar joints, often about a metre apart. Check the EPC, which may say 'filled cavity'. Ask the seller for a guarantee. The reliable answer is a borescope check, because patched holes can be from a fill that was later removed and EPCs are sometimes wrong.
What is included in Potters Bar
- Damp signs inside and out
- Visual check of walls and patched holes
- Short written report
- Guidance on tracing a guarantee
Guide prices for Potters Bar
| Existing insulation and guarantee check guide prices | Guide price |
|---|---|
| Existing insulation and guarantee check | £145–£245 |
This work is not insulation, so it is normally standard-rated for VAT. Guide prices include VAT where it applies. Guide ranges only: the fixed price is confirmed in writing before any work starts, and anything that could not be seen at survey is agreed with you first.
The steps for an insulation and guarantee check in Potters Bar:
Tell us what is happening
Postcode, property type and what you have noticed.
Price agreed first
We confirm the price before anyone visits.
Visit and checks
Photos and readings at the areas that matter.
Findings in writing
What we found and the options, each priced separately.