How to choose the best material for the extension

[Gow]

How to chose the most suitable building material to add an extension to a 1939 red sandstone mid-terrace house 

I attached the plans to my earlier post.  Planning permission has been granted.

 

What I have read so far:

(1) Timber - benefits as well as being cost-effective, timber frames are highly versatile, as they can be clad in almost any building material.

 

But, problems can arise with the shower room in the timber frame extension due to mould. The easy answer is to install a shower cubicle but that makes wheelchair access more difficult

 

The other options are

(2) Brick

(3) Prefab

(4) Modular

(5) Anything else to be considered before approaching local builders?

 

I haven’t a clue. Usually building firms usually work with  one type of building material.  Guidance would be welcome

Thanks

 

 

[Mr Punter]

Brick or rendered block would probably be best and cheapest and there will be lots of local builders who will be familiar with this. What do other extensions have where you are?  Make sure you fit a decent extractor in the shower room. If properly built and ventilated it should never have mould.

[Gow]

5 hours ago, Mr Punter said:

What do other extensions have where you are? 

The other extensions nearby are conservatories which were put up long before we moved in here