1930s house loft extension

[Sunnyshores]

Assuming no major problems, roughly how much does it cost to do a loft extension? Are there any huge variations in cost depending on (I dont know what ? windows?).
Just looking for really rough estimates please

First of all, just get a company round to see if you have enough height. We have a 1930s semi and although the (slightly different style of) houses further up the street all have loft extensions, we didn't have quite the same head height and would have needed to lower the ceilings in the bedrooms.

I think the height / current layout of the stairs determines whether you need a dormer to accommodate stairs going up to the loft. Our quotes were something like 20k for a basic conversion (permanent staircase between front and back bedroom, room that would have enough head height for a child's room or den / study), 30-35k for dormer on the side of the house to accommodate stairs over existing stairs & double room with decent head height, and 40-45k for dormer on side for stairs, plus a dormer on the back of the house so we'd end up with decent double room and ensuite.

Just have a big contingency fund. Our 1930s house has so far during the course of our extension thrown up:

• dangerous electrics (with no earth)
• rotten lintels
• dodgy 8mm pipes
• woodworm
• mould

So £50k max (plus contingency - hopefully not as much as Squidgy!)
Thanks!

Yes. Our delightful 1930's house OF DEATH threw up rotten beams, damp in the walls, literally deathly dangerous electrics meaning the whole house had to be rewired (which was an extra 3k and that was cheap) and steel pipework for the hot water, inexplicably in the loft. and a wasp nest.

I think we probably had about 10k of unanticipated costs (although this includes our downstairs of death as well). Our loft conversion is lovely, though not as big as I anticipated, and we have a decent bedroom and large en suite up there, and moved the boiler up there too, which freed up some space downstairs. Moving the boiler cost a grand, but we were demolishing the garage in which it previously lived and it wasn't much more to move it all the way up than it was to put it in the kitchen.

We've just had ours done including huge dormer, en suite etc and it cost about £35k (midlands)

Yikes, I am house hunting at the moment and quite like 30's semi's. That sound dreadful Squidgy . I wonder if that sort of stuff ever shows up on a survey?

Not on mine. Grrrr. Actually they did mention the electrics, but the structural stuff wasn't picked up. I do love our thirties house. Would prefer Edwardian'

Yes, we knew about the electrics too (though not quite what state they were in) but not about anything else. I am hoping that I will fall back in love with my house once it's all sorted..!

And the survey said they were cavity walls. Which they're not. So I have limited trust in them now!

nearly finished our loft conversion at the mo - 1930s detatched.

cost about £35k - 2 dormers, ensuite bathroom and full size staircase coming off the existing landing. only £1,300 of extras so far for extra boarding out and chimney removal.