If you post a rough plan drawing of what you propose on here, there will be some people that can advise whether it might be permitted development or require full planning.
Where do you start?
A= your starting point is getting an idea of whether planning is likely, then you need an idea of cost, so you can get an idea whether it’s somewhere close to your budget.
This forum is a good starting point where you can initial advice before spending money.
If you would like further advice on the process and who you need on board, please ask.
Change your thinking to "What do I need".Got no idea whats even possible
If you're going to be hands-on and have skills and free time then an extension could be a great idea.
If you're going to sit on a chair while paying someone else to do everything then these days you'd probably pay less just to buy a bigger house. This is because materials, labour are much more expensive than they used to be.
Plus most "builders" don't pick up a hammer these days, they stand about and make phone calls now and then. Pay someone £300 to dig a hole then charge you £3000 for it.
If you don't want to get your hands dirty but have technical skills then you can save a lot by designing and/or managing yourself, and employing tradespeople directly, cutting out the middleman.
Extensions routinely cost more than £100,000 these days, for something fairly unremarkable, if you want to be like the people on telly and do nothing but choose the curtains and carpets.
Seek out a good architect...they should be able to guide you through the process and come up with good ideas too
Is there a door between the hallway and loft conversion? Nothing there according to the plans.
Bit of a weird route to the kitchen from the front door, given that the loft stairs now block what I assume was once a hallway straight through.
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