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Just had something removed from a wall in our hallway and need to fill the hole that’s been left behind before painting. Pic below, the hole is 4cm square and into plasterboard.
Any suggestions as the the best way to fill it in?

Sticker?
Proper Job: Cut it out so it's a bigger hole and meets some studs or noggins. Then cut a piece of plasterboard to size, attach to the studs/noggins. Give it a quick skim.
Bodge Job: Newspaper and polyfilla or expanding foam with plasterboard stuck on top.
Edit: Couple of other options here https://www.diydoctor.org.uk/projects/repair.htm
Picture - job jobbed! 🙂
Make the hole neat and square with a plasterboard saw. Cut a piece of plasterboard that's the same width but with an extra 5 cm length. Stick a big screw into the middle of it so you have something to hold it with.
Glue or screw it into the hole. Then cut another piece the exact dimensions of the hole, chamfer the edges slightly, and glue or screw it to your new piece. Skim with Polyfilla or equivalent and paint. I'd also put a proper plasterboard backbox in for that FCU so it's flush mounted.
That's how I do it, anyway...
If I haven’t get any plasterboard sat around, can I just use a bit of wood in your method Flaperon? Then filler on top to make it level?
Or is that just to much of a bodge?
That's not a hole....
I took out a MDF bookcase with hardboard at the back...
https://photos.app.goo.gl/NtF1rLWiYcHBSziZ8
What flaperon says. I've done this several times myself very successfully!
If you want quick and easy and not be transporting plasterboard get some deep gap filler. Ronseal do a tub one for about a tenner .. bung it in and let it dry then apply a skim coat or filler. Wickes do small packets of patching plaster you can use for a skim coat...
I'd go with a similar method to flaperon if you have some plasterboard (or can find some in a neighbours skip) but if you don't then a bit of wood behind the hole and a load of easifil to fill will do the job. Get the quick setting stuff and build it up in a few layers and it shouldn't crack.
As per Flaperon - although for a ceiling hole repair I used some drywall repair clips like these
If you want quick and easy and not be transporting plasterboard get some deep gap filler. Ronseal do a tub one for about a tenner .. bung it in and let it dry then apply a skim coat or filler. Wickes do small packets of patching plaster you can use for a skim coat…
Yeah that's what I would do in the absence of plasterboard. I have done it once and the repair was 100% invisible once painted.
Cut the hole square. Cut a piece of plasterboard 2" bigger than the hole. Carefully cut throught the plasterboard 1" in fro the edge leaving the front paper layer intact. Peel the cut part off leaving the paper. Butter the edges of the patch, push it into the hole. Using trowel press on the paper and stroke outwards, squeezing the excess plaster compound under the paper edge and out. When dry skim.
Flaperon +1. A1/4 sheet of plaster board is only a few quid
Well then, Flaperon method done after I found some plasterboard in a neighbours skip.
Needs a good sanding and a bit of work to make it properly flat, but for a DIY incompetent I can very happy with the results.
Thanks all, STW to the rescue once again.
For an incredibly quick and undetectable repair j can recommend these.
Basically sticky scrim patches. I used them in the spare room on some big holes to save time on a short term project. I'll be damned if I can find the repairs in the roof now.
Was literally peal off stickies . Place over hole. Skim with prolite.