I used a plasterboard saw. Most fittings have quite a wide rim so the
holes don't have to be that accurate.
It's a bit of a fiddle because the laths tend to flap about when you're
trying to cut them and the springy things on the fittings have to be
positioned so they're not locking on to a bit where there's a lath.
Generally no problems, but you have to push the fittings quite hard to
get them to snap on to the ceiling
If you have access from above then it can be done without too much of a
On the hidden face of the ceiling - clean out any crud, apply PVA
solution and apply some fresh plaster to reinforce the old plaster.
Then cut your hole. In my case I cut the holes first then plastered but
probably wiser to plaster first.
The only other snag is the thickness of the plaster. It can be a tight
fit for most light fittings.
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