Is itvworth adding insulation when refitting a room

[KatyMac]

It's my kitchen/lounge & I am replacing the interior door any way both exterior doors are upvc so raising the floor to add some insulation won't matter

But if i do the walls I'll have to do skirtings and coving too so I wasn't sure if it's worth it - there are three exterior walls so it might be

3 exterior walls, sounds like definitely worth doing something!

Do you mean to insulate the walls? Ir the floor?

Is the floor concrete?

How old is the house?

Absolutely! You can also get insulated plasterboard if that's an option for you.

It's an extension and it looks new-ish I suppose 90s onwards so it will be cavity walls and insulated

I think the floor is concrete and I am wondering about floor walls and ceiling, I mean costs are only going to go up so now is the time i reckon as everything is coming out

Floor is complicated I guess I need underfloor heating but the boiler is old and I'm not sure it I should grit my teeth and replace that too

The house is 1950s ex council house and mid terrace with a side passage and the room I am looking at is the kitchen extension - which will become my lounge

I have insulated lining paper, it basically has a layer of polystyrene behind thick lining paper. When you hang is you poly fill any gaps and use a special glue. You can get an overlayer which protects the paper too otherwise as its polystyrene you can get dents if pushing furniture against it. Big difference between my walls with it and without though.

1950's house pretty sure to have cavity walls though some extensions may have solid blocks.

Cavity wall insulation is very good value, unless you have defective walls or are in an area of persistent driving rain, which an installer will check.

See if your local council or gas or electricity supplier has a scheme They are sometimes subsidised.

Beware of advertisers making unclear references to grants and trying to get your name and address

I looked into cavity wall insulation for my last house (also 50s ex-council) but there was an issue with the height of the damp-proof layer meaning any insulation would have sucked up the damp. That would have been through a govt/British Gas scheme but the installer told me it would cause more problems than it would solve.

The main house is cavity wall insulated you can see the holes

I was assuming the extension was built with insulation surely 90s onwards would have been?

I was just thinking of extra

We did ours when we did a full renovation.

We lost around 5-8cm off each wall, but it's made a huge difference to the room temperature.

It's not just skirting and coving to consider though. You may been to move radiators pipes, replace window boards, and refit flooring.

It's a huge job, but our house was VERY cold. And having spoken to neighbours who as suffering with condensation/damp after going with cavity wall insulation. I'm glad we did this instead, cos the hassle is over with no lasting negative impacts.

If the extension is from the 80’s onwards you’ll have cavity insulation.
You could drill a 12mm hole and have a look.
The big win is the ceiling insulation. If it’s a flat roof you could improve it with a new insulated plasterboard ceiling.

So maybe just ceiling and floor?

Hmm if I'm doing that I might as well do the walls I guess

Heating is never going to get cheaper is it?

Yep. We had to shift a floor joist to move rad pipes, and redo skirting board and coving in our dining room. Battened the wall out, and used insulated plasterboard. Well worth it in our case too (1920s house with previous 1970s crappy dot-and dab in that room that had been papered but not plastered first😣).

Really depends what you have already, as previously said. Insulation operates by the law of diminishing returns.