Ventilation in open plan room

[Fern204]

We have just moved into a house, renting it while we buy it. It has just been fully renovated, including a large L shaped extension. This is the living room/ kitchen diner, approx 9m x 6m.
There are bifold doors to one side, but the other two windows are non opening. One is above the kitchen sink, about 50cm high x 90 cm wide.
The other is full height, approx 220cm x 220cm. There is a recirculating ‘extractor’ in the kitchen.
Building regs has not had final sign off yet, as some electrical works still need to be completed. It will be done imminently to allow the sale to go through.
I am concerned that there is no proper ventilation to the room for cooking etc. Without opening a door in the bifold, which just now means we freeze. I have started running a dehumidifier as there is condensation on the bottom of the window frames.
Before I see the builder this week, what should there be? Anyone with experience? The room is also difficult to keep warm, it has two vertical radiators about 45cm x 150cm, but struggles to get above 18 degrees.

Any advice welcome.
Thanks

Sounds like it may have been renovated on the cheap or perhaps with design in mind rather than functionality (I.e. the people who renovated it were planning to sell as soon as it was renovated).

I am sure when we renovated it was part of the building reg approval to get a proper extractor (not just something that circulates the air). Even if its not, if you're not happy then you need to pick this up with the vendors particularly as it will lead to issues in the future.

As for the radiators, our open plan room is similar sized and we have 2 tall radiators, 45cm wide but they're 3 column and 2m tall. Its toasty. If you can find out what make they are and find them online, you can check the output in BTUs. Then you can input all the details of the room into a BTU calculator (dimensions, how much glass you have, what's above it etc) and see if you need more powerful radiators. Again, its worth finding all this out to see if you want / need to renegotiate the price.

Where is the external wall (or roof) nearest to the cooker?

Well I'd get at least one of the windows changed to an opening window, I'd like it over the sink so I had fresh air when food prepping at the sink.

Are the radiators getting piping hot all over? If they are working then you obviously need bigger more efficient radiators. our living room is large and we have three radiators with high btu's for their size, the room is toasty warm really quickly when the heating is on. I worked out the btu requirement myself, plenty of calculators online, having had a room never getting warm before due to plumber putting in too small a radiator.

Don't exchange until you've got this sorted.

The cooker is on an external wall, so it should be relatively easy to change to a proper extractor.
I agree with the opening window in the kitchen, the current window is definitely style over substance.

There are also no curtains so we will be doing that very soon too, it should make quite a difference.
I will have a look at the BTU calculator online and see what it suggests.
Thanks

My guess is the radiators are undersized. I would want an opening window in the kitchen and an externally vented extractor. Also the solid glass tall window could have an opening top half. It doesn’t need to be fixed glass.

Curtains and bifolds are a problem. The folding doors foul the curtains. Blinds are often better so they park above the bifolds.

good to see you can easily go through the wall. Hire a core drill with an overload clutch.

Example of an elbow/wall duct

and for the radiators, feel them to see if they are hot top/bottom/middle/sides

the incoming pipe (flow) should be "too hot to hold" and the outgoing (return) pipe should be "too hot to hold for long."