Building a self contained extension

Dub XV

We are looking at building a 3 bed house onto the side of our home for our Daughter and her husband.

We have a garage and were thinking of knocking it and building in its place. We could fit a sitting room and kitchen on the ground floor, 2 beds and a bathroom on floor 2 and 1 bed in the attack space as its a high roof.

What are the likely costs for something like this and what are the olanning implications for building a house where part of our house is/was?

DOCARCH

Any new house must comply with current building regulation standards and development plan requirements for a new house including energy efficiency, disabled access, minimum space requirements for bedrooms/living spaces, the provision of private space and the provision of off street parking (in addition to and not compromising the existing house). A new house will also have to have independent connection to utilities (drainage, water supply, electricity, etc.).

If you can demonstrate all standards/requirements can be met (while not compromising the existing house), and assuming the design for the proposed house is not incongruous, then planning permission should not be an issue. If you cannot demonstrate all standards/requirements can be met, then you are very unlikely to obtain planning permission.

For a new house, I reckon you would have to be 'ballparking' around E 2,500 to E 3,000 per m.sq. (finished) plus site works/services connections.