Sub floor ventilation

[Misericord]

Hello all

House we are considering buying has come back with a survey identifying widespread damp including from the cellar. Easy enough to fix but will keep happening unless sub floor ventilation is put in.

Has anyone had this done, and can give a rough price? Can give more details if helpful. Basically there is a big extension with a concrete floor, so where there were air bricks there now are none...

Thanks!

Yes, I have!

I got three quotes and there were thousands of pounds of difference between them. I think you have to be really careful with damp proofing companies - not all of them are very legit. Also, every situation with damp is a bit different. Sorting a really big problem might cost thousands, just providing a bit of ventilation is relatively cheap.

I ended up putting in some airbricks all around the house, and having some walls tanked - cost was something like £1200. But in our case I now think that the evidence of damp that they found was actually historic. During recent building work, I discovered evidence of a lot of wet rot that had since dried - an entire area of floorboarding had been replaced where this was, so I'm guessing there had been some kind of slow, long term leak that had already been repaired.

Thanks whisky - interesting to know quotes can vary so wildly! We may go down a similar route.

They all diagnosed the problem differently, and proposed radically different solutions. I think the top one was about £10k and the cheapest one £1.2k. So a huge difference. If you know and trust a builder, I'd get their opinion over a damp proofing company. There were a lot about a while back, and many offered 25 year guarantees that were worthless because they would dissolve the company every few years and start again.

Sadly I don’t know any builders anywhere near the area! It’s a new area we’re moving in to. So I am without a friendly contact and thus putting myself at the mercy of the kind people of MN :)