Happy to share - but more a case of frustration I'm afraid. Your circumstances may differ.
- reached out to Wandsworth Council and 2 suppliers.
- Need planning permission due to conservation area article 4 restrictions - approx £1.2k! And you can pay for pre-advice. Not sure how this aligns with Wandsworth's net-zero pledge!?
- Both solar providers said it wasn't worth doing because we can't use the front roof due to Planning regs and the 4 panels we could fit on the flat roof weren't worth doing.
- Deesolar and EHC were recommended to me.
Ground source heatpump
- Like many houses in the area we have Thames Water pipes running underground through the back garden, so that was a no. You need a fair amount of ground space and room for a hot water tank.
Air source heat pump
- Requires larger radiatiors and a hot water tank. We did the math, but don't have the bare wall space.
- Again requires larger radiators and are better position on the ceiling. As we were lowering the ceiling height this wasn't an option. I actually bought a smaller stand alone infrared heater from Herschel and I like it! However there is v little infrastructure on this in the UK. I did find a centre in Swindon with eco retrofit advice including infrared, but didn't get that far out of town.
https://www.nsbrc.co.uk/whats-on/our-wo ... -workshop/
Internal wall insulation
- Is really expensive and because it means you lose square footage my suspicion is that it reduces the value of your property. We insulated the new loft and some external walls, but mostly this was in line with building regs. Our builder didn't think the Spacetherm was worth it because standard plaster board is now insulating.
- Fitting thermal insulation under the wood flooring has made a signficant difference and is very noticeable on the ground floor (no underfloor heating)
https://naturalwoodfloor.co.uk/product/ ... roll-34db/
- We didn't go with the Haro flooring because there were issues with availability. However we did use a cork tile on the kitchen walls for sound and heat insulation, which worked really well and looks gorgeous.
https://www.amorimwise.co.uk/products/c ... ue-white-1
These people might be worth getting in touch with:
Good luck! Will be interested to know how you get on.
Wishing those microwave boilers would come onto the market soon!