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This all sounds great except the thought of a house being at 21c permanently, that's about 5°c too warm.
Unfortunately my house was built on a concrete slab, isn't insulated underneath and probably can't be channeled for in floor heating.
Being built in 1980 the ceiling heights are also low so building up floors won't work
Grumpy_Git
Bog standard Victorian house in E10, c.~1900, was 3-bed ~95m2, now 4-bed ~145m2.
@konastab01 all the upgrades were part of a big retrofit, along with kitchen and loft extensions.
Things like the ASHP were a no-brainer; had to fit an entirely new plumbing and heating system anyway, with the £7.5K grant making it much cheaper than a gas boiler system would have been.
MVHR was much cheaper than normal, as an installer friend specified the system and the ducting was fitted whilst the whole house was ripped apart anyway.
Insulating the suspended floors was expensive in terms of labour and waste removal (mountains of historic rubble under floorboards).
The extra insulation, airtightness etc fitted to the new construction elements wasn't much more than the cost of merely complying with regs to be honest. We are very lucky that our builder was up for experimenting with new materials and methods without bumping up the labour costs too much.
I'm also not particularly interested in 'payback periods' or whatever; all the upgrades were done purely to attain a consistently comfortable environment, reduce ongoing energy consumption, and minimise future building maintenance requirements (no damp = no ripping plaster off the walls in 10 years' time).