We've come across Dominic Payte, we've never worked with them, but haven't heard any negative press.
For your loft conversion and side extension if you haven't already got plans drawn up and planning permission in place this is something we could assist with. It's always best to use architects who aren't in house to the building contractors so that there are no conflicts of interest. If you wanted to get some comparisons on prices we also work closely with a number of contractors we trust, so you may be able to get a more competitive price.
Alternatively if you have all this in place already we are more than happy to answer any queries you may have and offer our advice if needed.
517 Old York Road, SW18 1TF
020 8874 6749