We’ve been wanting to do a ground floor rear extension (something like 4 x 3m) along with some internal rejigging for a good while. Never had any major building work done before so totally new to this.
I’ve seen various advice during thread searching, some saying if you don’t need planning permission then likely won’t need an architect (which I hear are pretty pricey.)
The main thing I can’t get my head around at the moment is, how do we figure out whether what we want is remotely affordable without sinking loads of money into detailed drawings first? I would have been confident that it would be affordable until reading the recent horror stories regarding spiralling building and material costs, now I’ve just no idea whether it would be feasible - but if possible would totally change the way we use our house and make it much better for us.
I have heard that some builders will do drawings, but then I feel like I wouldn’t then be able to take the advice of obtaining multiple quotes? Am I just overthinking all of this 
?
Any advice from a seasoned ‘house extensioner’ would be very welcome!