I need advice on what sort of lighting should go for in study and garden room. Plans are attached. The garden room has velux windows so is sloped, but ceiling in study will be flat. Any suggestions please!

Chisel out the mortar and lay the wire in the recess between the bricks and remortar. It's very seamless and if you aren't comfortable doing it a brickie should be able to do it very cheaply.

Hi Iconlux, Just to mention that skyglow and light trespass are now legislated against in the UK so really glad you encouraged people to think out their outdoor lighting well before going ahead with a plan using lights that can be seen from the neighbours or anyone wishing to see the delicate and beautiful night sky

This is def looking like more than £150k. £200k is more conservative estkmate. Be careful re: planning laws, you are often able to extend up to 50% more (volume) but you have to take into account existing extensions. So I think workshop in garden would focus the extension on areas you need within the house and not use up % of floor plan unnecessarily. Larger single storey (with velux), smaller extension upstairs would allow light downstairs and prob be more acceptable to neighbours and planning. Moving bathroom is expensive but if you keep kitchen, utility, soil pipe to one side it will create efficiencies. There is a wish list and then practicalities from planning permission and budget perspective which will need professional input. Light tunnels are a relatively cheap but useful way of getting light to darker places.