Cost of Building Bedroom Extension
 

I was thinking of maybe having a bedroom extension built.

It would be on the 1st floor and on top of an already existing flat
roof kitchen extension. I don't know if the foundations of the
kitchen extension were designed to hold the weight of an additional
floor as it was already built.

The extension would be approximately 7ft x 7ft built of blocks and
pebble dashed. The wall of the house which would have to be knocked
out to extend outwards would be (I assume) a load bearing wall as it
is an external wall).

Was just wondering if anyone would know roughly what it might cost to
build such a bedroom extension. Just a vague idea...

Cost of Building Bedroom Extension
 

SuzySue wrote:
I was thinking of maybe having a bedroom extension built.

It would be on the 1st floor and on top of an already existing flat
roof kitchen extension. I don't know if the foundations of the
kitchen extension were designed to hold the weight of an additional
floor as it was already built.

The extension would be approximately 7ft x 7ft built of blocks and
pebble dashed. The wall of the house which would have to be knocked
out to extend outwards would be (I assume) a load bearing wall as it
is an external wall).

Was just wondering if anyone would know roughly what it might cost to
build such a bedroom extension. Just a vague idea...

Its impossible to say without knowing if the existing flat roofed kitchen
extension would take the weight of the new 1st floor.
Could be 10-20k for a simple job depending on where you live.
A friend of mine had 2 rooms put on top of existing integral garage, which
could take the weight.
His is about double your floor area and it cost £30k, in the midlands.

Cost of Building Bedroom Extension
 

BillR wrote:

SuzySue wrote:

I was thinking of maybe having a bedroom extension built.

It would be on the 1st floor and on top of an already existing flat
roof kitchen extension. I don't know if the foundations of the
kitchen extension were designed to hold the weight of an additional
floor as it was already built.

The extension would be approximately 7ft x 7ft built of blocks and
pebble dashed. The wall of the house which would have to be knocked
out to extend outwards would be (I assume) a load bearing wall as it
is an external wall).

Was just wondering if anyone would know roughly what it might cost to
build such a bedroom extension. Just a vague idea...


Its impossible to say without knowing if the existing flat roofed kitchen
extension would take the weight of the new 1st floor.
Could be 10-20k for a simple job depending on where you live.
A friend of mine had 2 rooms put on top of existing integral garage, which
could take the weight.
His is about double your floor area and it cost £30k, in the midlands.




Budget at about 80 quid a square foot, and you won't be far off.

Cost of Building Bedroom Extension
 

If the foundation needs underpinning then this can add £000's to the cost.
Or even make it not viable (shifting clay or a raft required?)

If access is limited or there are other specific site conditions which mean
the builder is going to spend an extra week there, then this too will bump
up the price.

A pitched roof can be 33% more than a flat one.

So your £15,000 estimate quickly turns into a £30,000 quote. Or it puts you
off doing it, when in fact you could get it done for £10,000

You really need a local builder to look at it and give an estimate based on
his past experience.

You won't get an accurate/meaningful estimate here I'm afraid

dg

"SuzySue" wrote in message
om...
I was thinking of maybe having a bedroom extension built.

It would be on the 1st floor and on top of an already existing flat
roof kitchen extension. I don't know if the foundations of the
kitchen extension were designed to hold the weight of an additional
floor as it was already built.

The extension would be approximately 7ft x 7ft built of blocks and
pebble dashed. The wall of the house which would have to be knocked
out to extend outwards would be (I assume) a load bearing wall as it
is an external wall).

Was just wondering if anyone would know roughly what it might cost to
build such a bedroom extension. Just a vague idea...

Cost of Building Bedroom Extension
 

The Natural Philosopher wrote in message ...
Budget at about 80 quid a square foot, and you won't be far off.


7ft x 7ft =49 SqFt
49 x £80 = £3920

So, maybe £4000. That's not bad, I was thinking it might cost a lot
more. If I could get it done for something like this, I might get a
few builders in to give some quotes. BTW, I'm up north where I assume
building work is possibly cheaper (?)

BTW, how do I know if the foundations of the existing kitchen
extension are capable of holding an extension on top? Would the
builders know, or would I have to get an architect or surveyor to do a
survey?

Cost of Building Bedroom Extension
 

SuzySue wrote:

The Natural Philosopher wrote in message ...

Budget at about 80 quid a square foot, and you won't be far off.



7ft x 7ft =49 SqFt
49 x £80 = £3920

So, maybe £4000. That's not bad, I was thinking it might cost a lot
more. If I could get it done for something like this, I might get a
few builders in to give some quotes. BTW, I'm up north where I assume
building work is possibly cheaper (?)

BTW, how do I know if the foundations of the existing kitchen
extension are capable of holding an extension on top? Would the
builders know, or would I have to get an architect or surveyor to do a
survey?


Even if they are not, the price quoted is for full demolish and
redigging of foundations.

Unless its just a small area, its nearly always cheaper to prop, knock
down and scrape rather than underpin.

What costs is not teh zie of teh work per se- materials are only at best
30% of teh cost. What costs is fiidly stuff - and detail finishing.

I could not envisage doing a kitchen fitout for much less than 2 grand,
never mind the structure...


I think I was about halfway through the costs when I had a roofed
structure with boarded out walls and wndows etc. The rest was in the fitout.

Cost of Building Bedroom Extension
 

SuzySue wrote:

The Natural Philosopher wrote in message ...

Budget at about 80 quid a square foot, and you won't be far off.



7ft x 7ft =49 SqFt
49 x £80 = £3920

So, maybe £4000. That's not bad, I was thinking it might cost a lot
more. If I could get it done for something like this, I might get a
few builders in to give some quotes.


A general point. Double the costs and timescales that a builder gives
you. Experience shows this is about right mostly. Unless you go to a big
firm and draw up an expensive contract, which will be for slightly more
than double the amount that a jobbing builder quoted you, and estimated
twice as long...:-)

The only other way is to do it a few times and take contol yourself.
Then you can get it nearer estimates.

Cost of Building Bedroom Extension
 

Only the building control officer will tell you if your foundations are
adequate - you will need a trial hole and perhaps a formal Building
Regulation application to get him to comment officially.

Those rates appear way too low for even an approximate estimate. They do not
account for working a first floor level, scaffold, new ceiling/floor joists,
demolition and supports etc.

dg


"SuzySue" wrote in message
om...
The Natural Philosopher wrote in message
...
Budget at about 80 quid a square foot, and you won't be far off.


7ft x 7ft =49 SqFt
49 x £80 = £3920

So, maybe £4000. That's not bad, I was thinking it might cost a lot
more. If I could get it done for something like this, I might get a
few builders in to give some quotes. BTW, I'm up north where I assume
building work is possibly cheaper (?)

BTW, how do I know if the foundations of the existing kitchen
extension are capable of holding an extension on top? Would the
builders know, or would I have to get an architect or surveyor to do a
survey?