House extension

[Hibby70]

Anyone have any experience of adding a single storey extension to their house.

Would be about 20sqM and using the existing external doorways as internal doors so no knocking walls down.

I was thinking it will be in the area of £40k, does that sound about right ballpark? We'd be adding a kitchen but just wondered what the building costs would be just for the structure.

[Alfiembra]

It’s a “how long is a piece of string” question as there are so many unknowns that could add significant costs to your project.

Ground conditions, simple strip foundations?
Drainage, easy tie-in to existing?
Site access, can you get materials and equipment to the construction area easily?
Flat or steep sloping site?
Materials of construction. Traditional brick and block? Pitched roof? Timber frame? Flat roof?
Do you have a designer involved to handle planning/building warrant?
For a bare structure are you including windows and doors? Wall/ceiling finishes and insulation? Electrics and plumbing?

Sorry all sounds a bit negative but all things you have to consider to get even a ballpark figure.
On the plus side if you Google house extension prices your £2000/m2 may not be far off the mark but always better to err on the high side with any construction work.

[Moulin Yarns]

Don't forget you have VAT on top of any quote. And professional fees.

[Hibby70]

It’s a “how long is a piece of string” question as there are so many unknowns that could add significant costs to your project.

Ground conditions, simple strip foundations?
Drainage, easy tie-in to existing?
Site access, can you get materials and equipment to the construction area easily?
Flat or steep sloping site?
Materials of construction. Traditional brick and block? Pitched roof? Timber frame? Flat roof?
Do you have a designer involved to handle planning/building warrant?
For a bare structure are you including windows and doors? Wall/ceiling finishes and insulation? Electrics and plumbing?

Sorry all sounds a bit negative but all things you have to consider to get even a ballpark figure.
On the plus side if you Google house extension prices your £2000/m2 may not be far off the mark but always better to err on the high side with any construction work.

Yeah, sorry should have added that it's an extension to a 20 year old house in the same style, flat area with easy access. Probably the simplest of jobs I reckon (in terms of doing this kind of thing). I'll get a free quote done but just wanted a rough idea in my head whether it was within our £50k budget (ish)

[danhibees1875]

Don't forget you have VAT on top of any quote. And professional fees.

If I asked a tradesman for a quote (and am currently doing for some work to the garden) I would not expect them to quote excl VAT...

Different scale to what the OP is after, but surely the same would be expected for that job also.

[Moulin Yarns]

If I asked a tradesman for a quote (and am currently doing for some work to the garden) I would not expect them to quote excl VAT...

Different scale to what the OP is after, but surely the same would be expected for that job also.

I'm talking from experience. Architect said a figure, then got builders who quoted and they were all 20% or more above the Architect figure.

[Since90+2]

Anyone have any experience of adding a single storey extension to their house.

Would be about 20sqM and using the existing external doorways as internal doors so no knocking walls down.

I was thinking it will be in the area of £40k, does that sound about right ballpark? We'd be adding a kitchen but just wondered what the building costs would be just for the structure.

We got quoted for an extension about 4 years ago and it was around £2.5k per sqm. I would imagine these days you are easily paying £3k per sqm.

[Jones28]

Would the same costings apply to a demolition and rebuild job?

We have a part of the house that is pretty much beyond any help in my un-trained eye and in a few years I'm hoping to knock it all down and re-configure the whole area.

It's so cold in the winter it's unusable.

The house was built in the 70's and a timber framed/suspended timber floor was built between the house and the old building to join the house to this building and the garage which for some reason has been built in to this old building.

I've taken the floor up and suspended some insulation between the floor joists but it hasn't made much of a difference. Likewise I've re-insulated the loft of the old building and it's not helped much. There's a small log burner in there but we don't even bother anymore.

I'd like to knock these parts of the house down and start fresh and build in a smaller garage, utility room, shower room and office space with a gym and living area but I don't know if this is going to cost £100k or £200k. It would be approximately 80m depending on planning restrictions which is a larger footprint but utilities/heating etc already run the this part of the house.