This is an extension to the property with damp around windows I just posted about.

Basically the bathroom has no extractor fan, and I'm going to fit one. I also want to re-plaster. Is an extractor fan going to solve this problem, as the house is well ventilated most of the year through open windows, yet the problem still exists.

The wall construction is block cavity rendered I think. I haven't drilled a hole yet, but will be tomorrow.

Thoughts?

difficult to tell really, the extractor is pretty much essential on any bathroom, in fact part of the regs these days (and thats on newbuilds with huge insulate cavities dont forget) and that will help get rid of any condensation, however...

if thats a real old extension and theres no insulation in the walls, i.e. theyre cold then your still gonna have a battle... insulated drylining will nail it but its a costly exercise

i'd also be looking at penetrating damp as per previous post too...

if theres cold air round the windows (which there will be if theyre single glazed) thats only going to aggravate the problem...

theres always going to be moisture in the air, taking away any cold surface will stop it landing then hopefully it'll end up on the tiles and then in the bath....

the big problem with these jobs i find is money, to do the job belt and braces usually means almost gutting the place and if moneys tight you have to find the best solution for what cash is available, sometimes the customer thinks your being funny if you ask 'how much have you got to spend' but it saves you writing 6 different specifications out and even then you might not get the job...

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http://www.peterborough-plasterer.co.uk/

I've got the job.

It's a cottage lived in by a stable-hand at a nearby stud. I have the maintenence contract on all the buildings owned by the stud. Stables, houses, workshops etc etc.

That said, don't be illusioned, it doesn't mean I can throw money at it. The owner will veto me spending any more than, say £800 on it, that includes labour and materials.