Timber frame extension

Question

I'm building a timber frame extention and need to confirm width and depth of the footing. Alot of people are saying 450 wide and 1 metre deep. Is this excessive for a timber build.

Barry · Answer

No this will normally be standard for any build, it will cover you for any add ons later on and you must realise with stud work you’ll need insulation then whatever material on the outside plus the roof there will still be quite a lot of weight

Colin · Answer

Foundation for any structure comes down to the ground conditions but most are 1.200mm for traditional builds. Some timber framed are built on raft foundations according on how they join the existing dwelling.

Leigh · Answer

Any extension should be going through building regs 
This is something that is always checked by the building inspector (the footings) 
So if you're asking on here I would suggest getting drawings done

James · Answer

It depends on the ground, but that sounds about right. plus building control will confirm what they want

Robert · Answer

A timber build could still end up being quite heavy. Especially if it is made properly. A large shed is different to an extension or outdoor room.
However, a metre is excessive and the smaller measurement  should be fine.

Barry · Answer

Much of the weight in a timber framed extension is in the roof, but dont forget that timber walls and the wall covering you use will have weight. Assuming your overall wall thickness will be at least 200mm, 450 doesnt give you too much either side and its also the standard width of a digger bucket! As for the depth, 1000 is the minimum depth to get down to decent load bearing soil. If you want to stay shallow with your footings, a reinforced concrete slab with a thickened perimeter 'toe' may be your answer.

Antony · Answer

You don’t need to have a massive footing for a timber frame as it dosent weigh much

Michael · Answer

Don’t forget the weight what’s going too be inside the extension. Also the depth requirement. Will depend on your building inspector

Timber frame extension

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