On 23/04/2021 17:58, John Rumm wrote:
On 23/04/2021 15:15, PaulJoe wrote:

The house I'm moving into needs air vents adding under the
conservatory to ventilated the suspended flooring in the ground floor.
Can anyone give me an estimate of cost please?

Well when I needed to add some under floor ventilation here is cost me
about £3 / air brick and probably 10 mins work each.

It'll obviously need the con floor lifting and replacing. Thanks!

Why obviously? Normally air brick style vents are fitted from the outside.

Typically you would remove a brick, then mortar in a vent in its place.

Depending on the outside wall finish you may be able to take out a whole
brick with a brick removing chisel, or if rendered etc, just chop in the
perimeter with an angle grinder, and then use a chisel bit in a SDS to
knock out the waste.

I assume that the house has a suspended floor and the conservatory
doesn't? If so, it is going to be a big job. it is going to require
cutting trenches through the conservatory floor, making openings through
the house wall, cutting out the conservatory wall to fit high to low
level air-vents and ducts running through the cavity, fitting ducts in
the trenches and then making good. Basically the arrangement that I
used, except that I did it while building the conservatory in the first
place.