Idea of garage build on side of house

[heisthegaffer]

Hi all, possibly a piece of string question but i have a decent sized space at the side of my house, c. 9m x 5m so want to attach a garage to replace a worn out, small shed

Theres good access from the road down a small driveway.

Not looking for anything fancy, just a flat roof.

We are in Herts.

Any rough cost do we think?

Thanks

[trickywoo]

£25k + is my guess at the absolute minimum. By the time you’ve done electrics and maybe plumbing you’ll be doing well to be near £30k.

A flat roof of any size needs significant timbers / steel to cope with theoretical snow loading. You might be better off with a pitch roof as it shouldn’t really be a lot more expensive. Will look loads better and have a much longer maintenance free life.

[The Three D Mucketeer]

I wouldn't do a flat roof if you can avoid it...I replaced a flat roof with a pitched roof on my three car garage after finding leaks. Also try and do a vaulted ceiling (just in case you want a ramp or a tall vehicle)
If you organise trades people yourself and do some of the work then easily under £25K , but put it out as a complete job for a builder then probably a fair bit over £25k.

[heisthegaffer]

Thanks all. Id actually rather a pitched roof for storage of the ste I accumulate sonill factor this in.

If and when I get prices, ill report back

[SonicHedgeHog]

I’m in the middle of working out a budget for a side extension, half of which will be an insulated garage. I know you didn’t mention insulation but I’m really struggling to see how you can build a new garage with a pitched roof for £25,000. I guess it depends on materials and the kind of foundations you put in but prices are utterly insane. I’m amazed anyone on a normal income builds anything these days.

[RacingStripes]

Im adding 3m onto a 6x6m garage (so it'll be 6x9m). Its built apart from the cement slab (doors bought just not yet installed), and ive done all the work myself and im at just over £10k. Material prices are mental. £2k was planning, building and a tree survey. So £8k of materials.

[heisthegaffer]

SonicHedgeHog said:

I m in the middle of working out a budget for a side extension, half of which will be an insulated garage. I know you didn t mention insulation but I m really struggling to see how you can build a new garage with a pitched roof for £25,000. I guess it depends on materials and the kind of foundations you put in but prices are utterly insane. I m amazed anyone on a normal income builds anything these days.

I am beginning to think I might end up with a timber building (but then have to tackle it being on the boundary).

For mine i'd have the roof insulated and possibly the floor but not the walls as it only neede to be basic for a workbench, bike storage, rscking and maybe an area for my wife to do arts and crafts on occasion.

But I cant spend £25k on it.

[Simes205]

I m doing something similar, 4.5m x12m
Pitch roof
No electrics
26k plus vat

[SonicHedgeHog]

Simes205 said:

I m doing something similar, 4.5m x12m
Pitch roof
No electrics
26k plus vat

You must be doing some work yourself or using some odd materials? That’s 54m2 which means £500/m2. Foundations, tiles, bricks, a decent door…. What’s the catch?

[heisthegaffer]

Just recalled my brother had a single skin, pitched roof 7 x 3m garage built last year £13k inc electric door.

That replaced an old garage so most of the floor was there already.

Mine woukd be from scratch albeit 3 sided as attached to the house unless that makes little difference?

[OutInTheShed]

As an amateur, I'd guess that foundations and a slab for something built onto the house could be way more technical than a slab for a free-standing single storey garage?

Whacking up an outbuilding from blocks and rendering it will be a lower grade of work than extending a house for a built-in garage.

Break it down to components and tasks. A garage connected to your house probably costs more on every line of the spreadsheet?

Before you even start, there is design work, compared to off the peg repetitions of every other similar garage.

[Simes205]

SonicHedgeHog said:

Simes205 said:

I m doing something similar, 4.5m x12m
Pitch roof
No electrics
26k plus vat

You must be doing some work yourself or using some odd materials? That s 54m2 which means £500/m2. Foundations, tiles, bricks, a decent door . What s the catch?

Sorry 4x12 not free standing but simply against the length of house. Literally a shell with roller shutters , no tiles etc I m not lifting a finger except for the electrics.

Edited by Simes205 on Monday 23 February 06:46

[heisthegaffer]

OutInTheShed said:

As an amateur, I'd guess that foundations and a slab for something built onto the house could be way more technical than a slab for a free-standing single storey garage?

Whacking up an outbuilding from blocks and rendering it will be a lower grade of work than extending a house for a built-in garage.

Break it down to components and tasks. A garage connected to your house probably costs more on every line of the spreadsheet?

Before you even start, there is design work, compared to off the peg repetitions of every other similar garage.

Thanks. Didnt occur to me it might be more complex (naively).

Will be interesting to see.