Hopefully, you have investigated your existing building conditions. Have you consulted with a structural engineer as to whether the third floor framing can hold the additional live load and existing rafters can handle the changes as well as increased insulation depth? Have you talked to the building department to determine whether the available floor area based on ceiling height meets zoning requirements? Is access doable with a stairwell from the 2nd floor that meets fire and building codes? These are just a few questions that need to be asked. You should consider consulting with an architect face to face to expedite feedback that would be pertinent to your situation rather than asking us to give advice at arm's length.

We are adding a rear single story extension to our semi detached 3 bed house, the rear of the house is south facing so lots of natural light, our current design is for a pitched roof with Velux in the roof and triangular windows on the back wall. Has anyone encountered blinding shafts of light through these upper windows? At the moment we notice in autumn / winter / early spring when the sun is lower we have to put the blinds down at the back of the house. The blinds for triangular windows I find ugly and dust magnets, but our architect thinks I am mad to remove them from the plans Many thanks for all advice

Thank you so much for coming back to me, I really appreciate it. We are now thinking a max 30 sq metre extension and we'll have to tear down the poorly constructed extension that's there at the moment that houses the kitchen and utility etc. The front room will be a formal Living room and the next room which is currently the dining room will become the open plan living dining kitchen. I need to include a utility playroom and office in there somewhere too

Different angles of the kitchen we'd like