Building up/new 3rd floor/loft conversion

[brightandsunnyday]

Has anyone ever added a floor to their house - i.e. not just had a loft conversion, but had the old roof removed and a new floor/roof added? What should I consider, and how much is this likely to cost? I would imagine I'd need a structural engineer to check the foundations could support it (we are in a 60s/70s detached house on a slope - is this looking negative already?!). Current roof is very shallow and it's a square-ish house with the roof going to a central point, so really very little height for a standard conversion, even with dormers. We have plenty of space for a staircase to go up to a new floor.
I've tried googling but very little info found apart from people doing specialist things like raising houses to escape floodwaters!
Any experience/advice very welcome, thanks!

Friend did it

It added two double bedrooms and a bathroom. I think recall £75k inc the bathroom.

No that was exc the bathroom fittings

Thank you. Good to know!

You might want to think about planning issues before exploring this in too much detail. Was it built with a shallow roof because that was the "thing" at the time, or possibly to reduce the visual impact of the building on the skyline up the slope or avoid interfering with views for example? (I live in Oxford and there are protected "view cones" across the city in several places). I don't know much about it but suspect you could contact your council and arrange an informal chat with a planning officer to get an idea of feasibility in the first instance.

Good luck, sounds like a great project if it proves possible.

That's a good idea, thank you. My house is a bit of an anomaly along the road - a short 60s/70s House between 2 taller period ones - bomb damage perhaps? - so even if we built up I don't think we'd be taller than the ones either side. In suburbia so would be surprised if views protected too.

moduloft.co.uk/case-studies/

this company do this - have a look at their videos - work all done off site and craned in (bathrooms etc al ready fitted)

I would have a chat with planning first.

Wow!! That looks amazing and exactly what we're after, thank you!! I'll definitely give them a call! You Star!!

Hello OP....I'm having this done right now, the roof is coming off next week.

My house is older (late Victorian). It's an end-of-terrace - I am having a double-storey extension to the side, plus a single-story extension across the full width of the back of the house (in addition to the 3rd storey).

I'll be very happy to get change from £120k for the build, excluding two new en-suites, downstairs cloakroom, new family bathroom and kitchen.

My architect used to work for the planning department of my council, he knew what they would outright reject....the plans went through first time. He arranged for all the surveyors/reports, I didn't need to hire those folks separately.

Does your local council website allow you to view previous planning applications online? Mine does and it was great in the early stages. I would walk around my town until I found a house that had similar work done to what I wanted, then I had a look at their plans to get an idea of what would be involved. Also gives you an idea what your council will allow over and above permitted development.

I'm in the SE BTW, costs might be higher where I am.

Good luck!

Thank you goldierocks. We're in SE too. Are you allowed to post details of architect on here? It would be very handy to browse a website. I was thinking around £80-100k for the roof lift, so £120k including the extensions is less than I thought!

I'm not sure either! I've sent you his details via PM just to be on the safe side

We raised our garage roof to make a flat. It cost about £70,000 for everything. DH is a Structural engineer though!