cost of a new boxed bay window to extend living room

guntherbuffalo

Hi,

Has anyone had any experience adding a new floor to ceiling boxed bay window with a pitched tiled roof to the front of their house to add more space to their living room? About the area of a 2 or 3 seater sofa.

Any idea how much this would cost as an estimate?

thanks,

Paul

Brummie85

Cost wise I'm not sure. But you should seek planning permission as part of the process.

New bay windows (or alterations to the size of an existing bay) are classified as extensions and are notifiable works.

This will add costs and delays dealing with local Building Control & Planning. Be sure to make sure that the builder includes this in their quote. If they don't and you end up with a bay that is deemed illegal, you're in for a whole lot of trouble for the smallest gain of practical space.

guntherbuffalo

Ah that's strange I am sure I read somewhere on this forum that bay windows did not require planning permission if they were less than 3 square meters.

Brummie85

You could be correct. Each local authority can set their own policy in respect to what is considered a permitted development, but I would expect most would consider creating a bay window as an extension and would want you to go through their process for planning.

Even for window and door replacement....If you live in a Conservation area for example, they are unlikely to approve UPVC frames if the period of the surrounding properties dictates that aluminium or timber. They could issue a maximum bay size, insist on a colour, dictate roof type etc. It's only when you think a little bit about it that you see even something as simple as a Bay Window has a lot of choice and would quickly look out of place if developed freely.

You can normally have a free, informal chat with your local planning team and they will advise you of their policies, costs, standards, documents required for application etc. They may take details for records, but this is only ever done to put off rogues that get their advice and then decide to not follow the correct procedures.