barn conversion costs

[paulcockermouth]

We have a barn on my in laws that is a T shape, enough height to make 2 floors (and in 1 section possibly 3 floors). We have planning permission in place to convert into a large house with annexe. The kitchen/dining would be open to the roof(the upper left section of the T shape) and all the rest is planned for 2 floors. It has a brand new slate roof, with replaced joists etc. The sticking out section (roughly 10x6 metres) would need underpining. It is connected to the mains sewage and water, but no electric or gas (though they are available < 10m away). General state of repair is very good, apart from the sticking out section of the T, which is 300 yrs old and a little curved and in need of underpinning. In total it is split into 3 connected barns of roughly :

9mx4m planned as kitchen dining open to roof
14mx6m planned as bedrooms/bathrooms/open stairs etc on 2 floors
10x6 planned as lounge and bedrooms on 2 floors.

Total area rougly 320sq metres

Currently they have soil/old concrete floors with no other floors and just the original external walls - nothing internal i.e. they are shells.

We would do most work ourselves (in-law used to be in the trade but away at the minute) and we are currently trying to get a guide price. Contractors are quoting £800 - £1500 per sq m for barn conversions around us but obvioulsy we are doing 90% of the labour ourselves.....

How long is a piece of string....... any opening suggestions? How far would we get with 50k for example?

Edited by paulcockermouth on Monday 12th September 19:24

[paulcockermouth]

Thanks for the answers so far....sounds more promising than the 300k from a builder!

The barn is stone walls with rubblebetween and we would be looking to build block walls inside with lots of insulation and underfloor heating. 1 Kitchen , 1 bath and 2 ensuites. Would be doing everything my self (or inlaw) apart from:

underpinning and foundations/floors
plastering

Has plans for 5 beds but would be leaving 2 (1/2 the main part above and below) until the future...

[paulcockermouth]

Yeah the cost of services is a concern, currently looking into getting a quote. Father in Law is a (retired) sparky, though not part P, so will need to get it signed off.