Thankyou, you will be surprised what you can achieve, just make sure to do plenty of research online, if you need any advice feel free to PM me. Thankyou, I will add a photo soon. It's basically a recessed extractor and the vent pipe runs between the floor joists until it exits the external wall, luckily the joists ran in the right direction for this. Thankyou, the building inspector has been round a few times but the only thing that he has been required for were the windows so I could get a certificate that they were installed correctly. I also have the certificates for the electric work/plumbing if they ever required them. With it being a renovation and not a new build there seems to be a alot fewer regulations to adhere to..