Extension cost.

[aveatry]

Had a price for an extension...

Semi detached house, so whole width and 4m out,

That's another house

45k....this includes brickwork, roof with 2 roof windows, bi-fold doors and all plastering.
About right?
High?
Thoughts?

I have had 2 extensions and saved money by doing a lot of final stuff myself. Fitting doors, architrave, flooring, skirt, window sill, bathroom fittings, painting. Even some of the studwork that was within the original section but became part of the new build.

 

[pete01]

That's another house

I have had 2 extensions and saved money by doing a lot of final stuff myself. Fitting doors, architrave, flooring, skirt, window sill, bathroom fittings, painting. Even some of the studwork that was within the original section but became part of the new build.

Yes, the 45k price includes no internal work just the building and plastering.

 

[pete01]

About 10 years ago I had a 3m extension, I got a conservatory company to do it so it had a glass roof( it was bloody hot) that cost me 25k.

 

[Ivor Windybottom]

Price it up yourself. I'm about to build an extension that's a very similar size, but I'm doing it with a combination of DIY and trades. I've done it before, I find it works well and doesn't cost crazy amounts.

E.g. for me...

Planning drawings - by me £0
Planning permission £363

Digger and bloke for a day... £350
Soil removal... Hopefully nothing, I know people who want topsoil.
Concrete pour including pump truck... £1300
Note: No actual DIY up to this point, other than spray painting some lines on the ground.

Concrete blocks... £ to be worked out
(Will be built by me up to DPC)
Outer wall ripoff bricks that need to match existing... £1.69 each x (calculate number of bricks) - Note: probably my biggest cost, if yours are more normal bricks then you'll pay less
Inner wall nice light coloured bricks (I'm not plastering)... 42p each
Bricklayer £x per day x estimated number of days
Easy to get prices for roof trusses if getting pitched
Mate who's a carpenter says he'll help put up trusses
Cost of a roofer
Window and door... £1000 for DIY fit
etc

Obviously it all adds up, but it would be a good check for you to estimate how much you'd be looking at spending to do this sort of DIY-ish job. Then you'll know how much the bloke with the fancy pickup truck and a phone with suspiciously soft hands is making. You might even get tempted to take my approach and probably save £10k or more.

 

[Deluks]

The extension below (4m x 8.1m) came in at £57'500.

Half of that was to pay for the wax on your ski's.

 

[Deluks]

0
Planning permission £363

Building regs?
Party wall stuff?

 

[Ivor Windybottom]

Building regs?
Party wall stuff?

Stating the bleedin obvious?

Obviously include what needs including! Building regs aren't always needed.

Party wall? Our neighbours are cows.

 

[Ivor Windybottom]

People who call themselves "Builders" often don't actually do any building these days. They sit in their overpriced van making phone calls to actual tradesmen who do the work.

The modern method seems to be to estimate how much value they think it will add to your house and charge you a tiny bit less than that. Pay the blokes to do the job and keep the vast difference.

 

[noseall]

, but it would be a good check for you to estimate how much you'd be looking at spending to do this sort of DIY-ish job

Not really, not even close. A very poor comparison. About half the stuff is missing.

 

[noseall]

Half of that was to pay for the wax on your ski's.

...and edges.

You can't put a value on newly wax & edged skis, especially when you hit a patch of ice.

 

[noseall]

Inner wall nice light coloured bricks (I'm not plastering)... 42p each

How are you mitigating the absence of D&D plasterboard when factoring in the 0.18W/m²k target?

 

[stevie888]

Not cowboy at all I've used this builder many times.

If you've used him many times why pray tell are you asking the question??

 

[Koolpc]

If you know him, have dealt with him, seen his work, he is trustworthy then go with him I say...

 

[Deluks]

Stating the bleedin obvious?

Obviously include what needs including! Building regs aren't always needed.

Pretty sure you'll need to follow building regs for an extension!

Party wall? Our neighbours are cows.
More reason to pay some legal bod to cover your behind.

 

[pete01]

If you've used him many times why pray tell are you asking the question??

I'm not questioning his ability im asking if the price is right or close ish.