David O'Doherty recently did a similar but bigger job for me when we had a large patio door fitted - the opening was so precise the door fitted like a glove, he worked to engineering drawings for steels etc and dealt with Haringey inspectors who cleared his work. David has done a lot of work for me over the years and frankly I wouldn't use anybody else for such work, I've recommended him to many other satisfied customers. He's coming back to lay our patio soon so he'll be in the area.
If you do nothing else I would suggest you get a quote which rest assured will be honest and reasonable - you can't ask for more than that from a builder.
Feel free to ring him on 07830119421 - if he doesn't pick up leave him a message and he'll get back to you.
Really helpful. Have a few options now so will see who I can get hold of!
You're welcome - I hope all goes well.