Building Reg Certificate after completion of work

[Mel65]

Some non structural work was done when I bought my flat and at that the builder said there was no need to obtain a building regulation certificate due to the nature of the work. The builder removed a wall to extend a bedroom (non structural wall) and a shower room was added. Everything was done with proper fabrics. Now I want to sell the flat and buyers surveyors are saying that I should have had applied for a certificate from building regulation. Is it necessary ? And can I still apply now for a certificate ?
Thanks for your feedback. I am confused as my builder keeps insisting on the no need for certificate.

 

[denso13]

This work should have had building approval, especially fitting a new shower room. You should check with your local council planning/building department on the best way forward but you may find it extremely difficult and costly at this stage.
http://www.n-somerset.gov.uk/Enviro.../retrospectivebuildingregulationsapproval.htm

 

[DevilDamo]

Speak to your local authority Building Control department to see how they can assist. Worse case is you'll have to submit a Regularisation Certificate, which costs a little more than a normal Building Notice/Full Plans application and some of the existing (now complete) works may need to be exposed to the Building Control Officer can sign them off. A drains test may also be required, if new drainage has been provided.

Does the Shower Room have a window, mechanical extract, etc...?