Extension prices

Can anyone give me a very rough idea on price for a two storey side extension .

8 foot wide x 27 foot

 

Around about £58,000 for budgeting purposes.
Basically £1500 per m2 of floor space.

 

Gone through the roof in the last 12 months - take a breath and see what it is in 18 months

 

£58,000 wasn’t expecting that much haha

 

No he’s going on the side!

 

Afraid so. And plenty work on £2000/m2 so you really need to prepare for getting quotes at 50grand and upwards, sadly.

 

8ft x 27ft is 20m2 though which is £30,000.

 

Two storey, twice the floor space.

 

It doesn't cost twice the price though, the second one is much cheaper.

 

I shall bow to your far superior knowledge then.
26 years I have been doing my job totally wrong, it appears.

 

Not wrong, just overcharging. You seriously charge double to add an extra floor?

 

Thought about having a go yourself?

 

It’s a loose way of quoting but the price is per m2 of floor space whether that be ground floor, first floor or attic space.
It’s not a hard and fast rule, but is near enough for budgeting.

 

Not really overcharging as the rates are applied to the overall floor space. Also you could have awkward roof details/junctions. These rates are applied for initial feasibility purposes only. Until a detailed spec and drawings have been developed then it gives the home owner an approximate idea of the cost.

 

I was told £30,000 all in for similar measurements, can't see it being much different in price, but some builders are just being a bit greedy aswell, don't rush into it.

 

The price of construction material s have gone through the roof ..literally

 

@Julian Broddle's Perm this is ‘his game’ and he knows what he’s on about! I built a house from scratch and this calc for estimating is very commonly used. People tend to split into three prices per sq m or foot depending on finish. It’s obviously broad brush but is reasonably accurate.

In terms of double price for second story I can see that (it’s a rough guide remember) but the roof area does add cost . Also depends on what type of floor you have upstairs ie block beam or not. Remember going up means you need stairs / more windows / rafters / roof tiles / scaffold / cranes etc etc

personally I would save cash and wait for next years recession ! Take time getting quotes / planning etc

 

The other consideration is that as soon as you start to upspec anything the costs spiral. Also they do like to charge for demolition costs. But first extension quote I ever had included £10k before they’d started building (did it myself for <£1k).

We were recently quoted >£600 for less than 3 sqm of tiles (that’s supply only and I’d not even asked for grout or adhesive) eventual bill will be 1/3 of that. But ‘better’ insulation, windows, doors, door furniture, electrical outlets etc are all hugely more expensive than the basic that’ll be in the quote.

I’m planning an infill extension, the 2 tradesmen in the family tell me we can put it up for less than £5k (that’s based on zero labour costs), and I know it’ll be >£20k because most of that will be in bifold doors and a large roof light. Their price is based on a traditional build.

 

How much for an extra couple of inches? Not wanting to be greedy Mr Preedy.