In an earlier contribution to this discussion,
Phil L wrote:


If you are changing the use of the garage to a dwelling area, then
planning and/or building control will need to know, they'll also want
to see the foundations which will mean diging some test holes
outside, they'll want to know if there's any DPM underneath the
existing floor and if there's not you may have to dig it out and get
one in and probably insulation under the floor too, and also the
walls and ceiling.
The foundations shouldn't be too much of a problem. There probably aren't
any across the doorway - but there won't be much to support anyway - just
the brickwork in the lower part of the doorway and the window. The concrete
floor will support that ok. Everything higher up is supported by the lintel
which, in turn is supported by the brickwork and foundations either side of
the door.

The garage floor is almost certainly several inches lower than that of the
adjoining rooms, and will need to be made up to house level - so there is
plenty of scope for installing a DPM and insulation if required.
--
Cheers,
Roger
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