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PostPosted: Thu Aug 03, 2017 1:24 pm 
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Hi,
Wanting to get an brick/block built outhouse in place where current timber garage is, will be within permitted sizes to not require building regs, but ideally should still get regs if we sell house in future.
The outhouse will be longer than the current garage to make it go all the way to rear of property, up to the connifer hedge. This hedge is the neighbours at the rear.
A couple of builders currently quoting seem fine with the hedge, but another couple are concerned about the foundation we'll need building, 1 mentioning they may need to dig down 2.5 metres etc.

What is a good suggestion for the foundation to keep costs down, and what prices would I expect to have to pay just for the foundations do you think?
External base sizes are 3300x9200.

Thanks


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PostPosted: Thu Aug 03, 2017 1:53 pm 
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The guy who seemed concerned about the hedge was correct that under building regs that you may be looking at a deep foundatio because of the hedge.

One solution may be a 'raft foundation'.
My advise would be to go visit (or telephone) your local planning office and seek their advise. I am sure you will come away with all the advise you need. Say it was a raft, you would be made aware of the required thickness & reinforcement requirement etc. This may work out better for you, as I would assume that you always intended to provide a floor, so if you trowelled your raft to a 'finish' then you would already have an excellent floor.

If you did go with deep strip foundations, you would have additional costs of:-
Excavation
Sub-structure blockwork
Backfill to excavation
Concrete floor.

With a raft, cost considerations would be:-
Area excavation
Perimeter formwork
Concrete
Reinforcement
Hand trowelled finish



davyp1



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PostPosted: Thu Aug 03, 2017 2:00 pm 
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Thanks davyp1


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PostPosted: Thu Aug 03, 2017 6:12 pm 
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Just for clarification, permitted development is for planning not building regs. You can always apply for a certificate of lawfulness if you are unsure whether permission is needed

for building regulations, detached garages dont need building regulations if less than 30 M2 and further than 1 metre from boundary

or if closer than 1 metre from boundary, then needs building regs required unless built from non-combustable material (between 15-30 sq metres)

That is an internal floor area (I think!)

If you dont need building regulations, then you dont need to comply with any foundation depth requirements. Although you dont want it falling down!

If it isnt a building regs compliant structure you wont be required to supply certificate on selling. Note however that a non compliant structure cannot get building regs later on.

Building inspectors will not approve a raft foundation design without a structural engineers calculation.


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PostPosted: Thu Aug 03, 2017 6:18 pm 
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Thanks Notch1 for additional info


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