Dear all

After reading the news groups archives and the building regulations for
the past few days. I have made some (but slow) progress in the design of
my extension. What I have so far is:

My house (1960s) semi detached is 6445mm wide and 7130mm in depth
(excluding the porch). I have a side entrance with is 2360mm with at it
narrowest point (including the brick wall which I am responsible for
450mm wide).
I have a private (I think council not back from Christmas yet) drain
running parallel to the back of my house, with the edge of the man hole
cover being 2680mm from the back of my house (and ending 3200mm from the
back of the house).

I have an old garage in the back garden, which starts 4200mm from the
back of the house. This will eventually be demolished, since it is made
on a solid slab, and I don’t want to loose any more garden this will
turn in the patio after the rebuild has been completed. Therefore my
back wall of the extension must be between 3200mm & 4500mm away from the
house. That’s the background out of the way, but I thought it might be
helpful.

The garage will be built in the side entrance and I need it to be as
wide as possible.

Can I assume the 450mm wide brick wall that I am responsible for is on
my land and therefore when I remove this wall my foundations can take up
the space where this wall once sat ?

I am planning for the garage on using 100mm (building regs say 90mm Min)
concrete block in a single leaf wall with from end bonded at least
190mm(this will also form one side of the door way. The other end will
be bonded to a two leaf wall which will form also contain dual doors (30
minute fireproof) for access to the extension living area. The
regulations also say there must be piers at a maximum of 3000mm apart
since the garage will be 7133mm long I am planning on having two piers
at approximately 2377mm intervals. The doors between the garage and the
main living area will be will have a step not less that 100mm high, and
any pipes entering the garage from the existing house greater than 40mm
will be fire proofed.

Dose this sound ok to every one? Have I missed anything?

I am still looking into the roof. I defiantly want a flat roof to stay
in keeping with the neighbours. I assume I can have a cold roof for this
un-insulated garage? Made up I guess of marine ply and multiply layers
of felt (3 I think).

The roof joists. One end is fixed to the wall I will build out of
concrete block.
The other end I assume is fixed to the house by joist hangers?
One answer I can’t seem to find is,

What do I do about the bit of the garage between the top of the door
frame and the roof? Does this have to be block, and if so what holds it
up or can it be made of wood and fastened in the same way as the joists?


The garage will be built first then the extension, but while I am
thinking about blocks
The last question in this post, should I and can I use the 100mm
concrete blocks for the inside and outside walls of the main extension
which will be going across the back of the house and garage. I am
planning on rendering the garage and extension to ensure they are in
keeping with the neighbourhood.

Many thanks

Andrew

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