Extensions: single storey Vs double story

[Consigliere]

Chatting with several friends (who have had extensions in the past) and discussing my plans for a single storey rear extension. I Should be able to get a 6m x 7m single storey done under PD. I can of course have a double storey like a neighbour has done and add an additional bedroom - which we could do with but I suspect would be a considerable amount more.

All of my friends said adding a second story wont double the cost and would not be much more, which has now caused me to rethink my plans.

Question is how do I get costs for a single storey vs a double storey without plans? I don't really want to pay an architect twice to draw up plans for single storey and double storey so that I can get quotes - what's the best way to proceed?

[Equus]

LINK

[z4RRSchris]

single floor extensions in SE are coming in at £2500-3000 psm at the moment, which is a piss take number but thats what it is.

add a floor and add 70% of the above rate on the area.

good estimation.

doing it under PD (the larger extension neighbour consultation scheme to get 6m) prefereble than inviting all your nimbys to have a view.

[Equus]

z4RRSchris said:

...doing it under PD (the larger extension neighbour consultation scheme to get 6m)...

This is only applicable to single storey extensions (and it allows up to 8m. if your property is detached - the 6m. figure applies to non-detached).

Personally, I'd suggest that if you're planning to spend a £6-figure sum on an extension, it's short-sighted to compromise for the sake of a £few hundred and a couple of months wait.

Your immediate neighbours get to comment on the 'larger extension' PD scheme, anyway, but in any case neighbour comments don't make a huge amount of difference either way - the Planner will make their own decision, largely regardless of whether the proposal is supported or opposed by your neighbours.

[satans worm]

i would say go double if its allowed, the single story extension costs have the ground work and roof built in, going up a level is brick work on the outside only, especially if your just adding a bedroom as no additional plumbing/ bathroom stuff required, as an investment at least, it would make sense, unless you were looking at a glass roof on the single story and or wanted it vaulted, then it changes things

[Consigliere]

z4RRSchris said:

single floor extensions in SE are coming in at £2500-3000 psm at the moment, which is a piss take number but thats what it is.

add a floor and add 70% of the above rate on the area.

good estimation.

doing it under PD (the larger extension neighbour consultation scheme to get 6m) prefereble than inviting all your nimbys to have a view.

I'm in the West Midlands - i think the going rate here is between £1,500 to £2,000 per sqm.

Equus said:

This is only applicable to single storey extensions (and it allows up to 8m. if your property is detached - the 6m. figure applies to non-detached).

Personally, I'd suggest that if you're planning to spend a £6-figure sum on an extension, it's short-sighted to compromise for the sake of a £few hundred and a couple of months wait.

Your immediate neighbours get to comment on the 'larger extension' PD scheme, anyway, but in any case neighbour comments don't make a huge amount of difference either way - the Planner will make their own decision, largely regardless of whether the proposal is supported or opposed by your neighbours.

Yes, mine is a semi-detached so I can go out 6m, property is 8m wide but i need to allocate some space for side passage and i don't want to build on the boundary with my neighbour. Also 6-figure sum is not what i think it would cost, but do need a ball park.

i might have to call round a builder or two for tea and cakes whilst they give me an opinion on what they think - if its 6 figures for a single storey its a no -go from me, just cant finance it.