I would imagine it is quite an extensive job, but with such a sparse description it is impossible to comment with any accuracy. There would be a wide difference between a bungalow and a two storey house for example.
tidoh wrote:Currently the soil pipe in my house runs internally through the bathroom and kitchen. How big a job is it to move the pipe outside thus freeing up room in both the bathroom and kitchen
house is two storey and the pipe runs from where it is vented through the roof straight through the bathroom and kitchen then goes to the drain under the kitchen floor the drain being outside with just the bend under the kitchen floor
The cost of materials and labour for installing the new pipe outside would be between £200 and £300.
Then there is the cost of digging up the ground outside to make the new connection as well as repairing the roof and fitting new tiles. Cutting new holes through the walls for the bathroom and kitchen wastes and new connections needs to be factored in too.
As I suggested, not a simple job by any means and the overall cost could very possibly be in the region of £500.
Oh, and I forgot to mention, you would also be required to inform the Building Control Department at your local Council as you would need to demonstrate that the work carried out conforms to Building Regulations.