Extension costings
Discussion
Anybody any idea on the latest m2 costings for an extension? Live in Aberdeenshire so not the cheapest of places to build. Extension is 2 stories and total floor area is approx 310m2 (includes area of both floors) and includes a double garage which is built in. Just really after a build cost can add allowances in on top myself for kitchen and bathrooms etc. Costings on the internet seem to be all over the place but I'm hoping the large size and economies of scale will help me getter a cheaper per m2 cost. Build is fairly standard however the roof will be Zinc.
Trying to work out if I'll be able to afford to start it next year.
Trying to work out if I'll be able to afford to start it next year.
Doing at the moment what I think sounds very similar myself, double garage, bigger kitchen, dining room and 2 ensuite double Bedrooms. Have look here http://www.pistonheads.com/gassing/topic.asp?h=0&a...
To date spent 25K but have done a fair chunk myself..
Paul
To date spent 25K but have done a fair chunk myself..
Paul
310m2! That's bloody huge for an extension!
I have no real idea of cost, I guess to build a house that size it would be about £180-220k? So something around that sort of price?
General rule of thumb is £1000 m2, but I guess an extension, if done over time and you subby the work out, should be doable for less.
I have no real idea of cost, I guess to build a house that size it would be about £180-220k? So something around that sort of price?
General rule of thumb is £1000 m2, but I guess an extension, if done over time and you subby the work out, should be doable for less.
Hi Paul,your extension looks good, a lot of hard work done yourself I see there. I will definetly need to go down the builder route though, won't have time or the skill to be able to do it myself, I'm liking that resin garage floor thought that someone mentioned on the thread will have to bare that in mind.
Slagathore your right it is huge, just checked the dims again and they are correct. If I could do it for the money you mentioned I'd be happy enough though.
Still have to bottom a few things out though like how I'm going to heat the place, thinking oil that I'm on now maybe a bit expensive, although I have just dug a fairly big pond next to the house so wonder if GSHP maybe would becost effective as I could put the pipes in the bottom of it which I believe is more efficient than in the ground??
Slagathore your right it is huge, just checked the dims again and they are correct. If I could do it for the money you mentioned I'd be happy enough though.
Still have to bottom a few things out though like how I'm going to heat the place, thinking oil that I'm on now maybe a bit expensive, although I have just dug a fairly big pond next to the house so wonder if GSHP maybe would becost effective as I could put the pipes in the bottom of it which I believe is more efficient than in the ground??
Redleicester and getcarter may be useful to provide input on heating large areas.
I reckon there are two ways to consider. Some sort of wood/multifuel boiler, or a heat pump.
And a heat pump could be either air sourced (much lower capital cost) or ground/water sourced (lower running cost).
Make sure you fit water pipes into the slab in any case and start doing some research.
I'm involved with air sourced heat pumps here in NZ, we can get away with them as daytime temperatures are never below freezing. However I've just had some specifications of new units i'm going to be buying from China - built for the European market with reasonable efficiencies down to -20c - with outputs up to 87kW.
Note if you do go the heat pump route you will need three phase, does the house have this at present?
BTW - surely you should be looking at house building costs rather than extension costs?
The problem with any of these heat pumps as far as I see it is that as the original house is 130 years old with suspended timber floors it is not really suitable for retrofitting underfloor heating into that part so unless I find out otherwise will probably have to stick with radiators. Guessing I would have to massively oversize them otherwise they will not work very well with the low flow temperatures. Aberdeenshire is bitterly cold throughout the winter months as well. Having said that Cazique we will be renovating all the original side of the house following the extension build so there is scope to get underfloor heating in if it can be done with a suspended wooden floors and without reducing headroom to much especially upstairs.
The dressing room is likely to change though as we are probably moving the fire to the opposite corner of the kitchen below, so that will increase the space in the dressing room as the chimney will not be coming up the back of it. It will also give some usefull heat into the bedroom. That dressing room is probably bigger than you realise already though and seeing as we currently do not even have a wardrobe in our bedroom it will be a massive improvement.
The dressing room is likely to change though as we are probably moving the fire to the opposite corner of the kitchen below, so that will increase the space in the dressing room as the chimney will not be coming up the back of it. It will also give some usefull heat into the bedroom. That dressing room is probably bigger than you realise already though and seeing as we currently do not even have a wardrobe in our bedroom it will be a massive improvement.
You can retrofit it, it just sits between the joists in a little tray type thing. Probably a fair bit of work to do the whole upstairs, but if you're going to be revoating it after the extension, then you can live in the extension whilst it's done. It's only really the floorboards that have to come up, then they can insulate below the trays as well why they have all the boards up.
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