Draughty Extension - any fixes?

wingforward

Hello folks
Looking for a bit of advice on several issues that all revolve around the same area in my house, my back extension, and how cold it is.
In the current weather conditions, when we leave meat out to defrost, it doesnt...its that cold!

The house itself is an extremely old, >100 years, redbrick terraced house.
The main house itself is relatively fine, its drylined, insulated boards, and holds heat well & is relatively easy/economical to heat up.

The extension contains 2 rooms, a bathroom & kitchen, & there is a back door in a small hall.

The extension has a flat roof.
I have a fair idea why the kitchen is as cold as it is...it has a large window & a flat roof. It is not drylined & unsure about any insulation in the walls. The floor is also freezing so i suspect no insulation there either. I'm guessing its an early 80's extension.

I put a new ceiling on a few years ago, before moving in & there is some rockwool in the ceiling...There is one large double rad, but unless its on all the time, you would never know it was on, and it does work fine.

My reason for this post is that I am at a loss as to why there is such a draught in the kitchen

It requires force to open the door into it! and this is with no windows open etc...
Anyone any ideas?
There are spots in the ceiling...

I cannot compare to the kitchen to the bathroom as this is not in use - I've just had it plastered, all ext walls with 50mm insulated slab.
I didnt do the ceiling though as money an issue...
I hope to sell the house at a future point in time (hopefully sooner) so trying to do a balancing act on "fixes" vs money...
I guess to fix most of my issues the flat roof would have to go, and insulation in floors/walls...actually it'd be handier to just knock it and build it up again!
But anyone any ideas on the draught, I reckon if I got rid of/lessened this it would be a big help, but no idea where the draught coming from.
It really emphasises to me how important air tightness would be on any future build!
Thanks

MicktheMan

Get a air tight test done and recommendations will flow from this. Make sure you're there for the test as "seeing is believing".

jamboambo1

I have a similar problem myself . Who would conduct an airtight test?

MicktheMan

jamboambo1 wrote: »

I have a similar problem myself . Who would conduct an airtight test?

pm sent