Having spent quite a bit already on professional fees, I need to work out whether an eco refurb is likely to be affordable before spending any more. I don't expect an economic payback within my lifetime - just aiming to reduce carbon footprint and to build a bit of domestic resilience.

I'm particularly interested in the Heat Geek Ministore, but their on line estimator just invites me to pay GBP 750 for a detailed plan - and my architect has already done mush of the work on that already. It would be good to know more before committing.

Heating would consist of ASHP providing warmth for Domestic Hot Water (say 40 C), Under Floor Heating on ground floor (variable, say < 30 C) and possibly retained radiators (4) on upper floor using existing 10mm plumbing - maybe with an option to also replace radiators/plumbing if there is any money left. (In practice we hardly ever use uppoer floor radiators - just go to bed with a thick duvet.)

Biggest challenge for DHW would be a very occasional hot bath and I'd like to have an immersion coil in the cylinder to help, but I don't see that as an available product, yet.

Space is very limited so I'd like to know all the sizes (and the likely prices) of any additional equipment needed - how big is a 'manifold' and how many do I need?

We have plans for more insulation - underfloor insulation beneath new floorboards throughout ground floor; and rear wall external insulation if I can get away with capping the top edge rather than extending the roof above it.

Having renewed the floor, we want to never disturb it again, so we would run services behind wainscoting and not below the joists. We are also holding back rising capillary moisture in all walls by putting a Newtonite membrane behind the wainscoting (up to approx 900mm). This membrane would enable moisture to be vented into the floor void, where there are air bricks.

We had considered a unified MVHR system but, single-room ventilation/heat recovery units are a bit less costly, less disruptive, and more flexible - although slightly less efficient.

The lower half of the kitchen will need to be rebuilt, after replacing the floor. The upstairs bathroom will need a complete refit and rewiring: HW Cyclinder would live there and the washing machine and dryer would be relocated there from the kitchen.

We are removing the gas boiler from it's current position inside a small extension and repurposing the space to upgrade a toilet into a small wet room - toilet/shower.

If at all possible (funds may not allow), we would install solar PV on the SW-facing half of the roof.

Advice on any of the above would be welcome. Could it be done inside a GPB 100k budget?

Edited 33 minutes ago33 min by John Coyne
typo

32 minutes ago, John Coyne said:

Having spent quite a bit already on professional fees, I need to work out whether an eco refurb is likely to be affordable before spending any more. I don't expect an economic payback within my lifetime - just aiming to reduce carbon footprint and to build a bit of domestic resilience.

I'm particularly interested in the Heat Geek Ministore, but their on line estimator just invites me to pay GBP 750 for a detailed plan - and my architect has already done mush of the work on that already. It would be good to know more before committing.

Heating would consist of ASHP providing warmth for Domestic Hot Water (say 40 C), Under Floor Heating on ground floor (variable, say < 30 C) and possibly retained radiators (4) on upper floor using existing 10mm plumbing - maybe with an option to also replace radiators/plumbing if there is any money left. (In practice we hardly ever use uppoer floor radiators - just go to bed with a thick duvet.)

Biggest challenge for DHW would be a very occasional hot bath and I'd like to have an immersion coil in the cylinder to help, but I don't see that as an available product, yet.

Space is very limited so I'd like to know all the sizes (and the likely prices) of any additional equipment needed - how big is a 'manifold' and how many do I need?

We have plans for more insulation - underfloor insulation beneath new floorboards throughout ground floor; and rear wall external insulation if I can get away with capping the top edge rather than extending the roof above it.

Having renewed the floor, we want to never disturb it again, so we would run services behind wainscoting and not below the joists. We are also holding back rising capillary moisture in all walls by putting a Newtonite membrane behind the wainscoting (up to approx 900mm). This membrane would enable moisture to be vented into the floor void, where there are air bricks.

We had considered a unified MVHR system but, single-room ventilation/heat recovery units are a bit less costly, less disruptive, and more flexible - although slightly less efficient.

The lower half of the kitchen will need to be rebuilt, after replacing the floor. The upstairs bathroom will need a complete refit and rewiring: HW Cyclinder would live there and the washing machine and dryer would be relocated there from the kitchen.

We are removing the gas boiler from it's current position inside a small extension and repurposing the space to upgrade a toilet into a small wet room - toilet/shower.

If at all possible (funds may not allow), we would install solar PV on the SW-facing half of the roof.

Advice on any of the above would be welcome. Could it be done inside a GPB 100k budget?

Hi John.

Way too many variables for even a close stab at prices; geography sways this massively, plus spec / materials quality / better trades & installers, and much more. Do NOT take guidance from anyone who would just pluck a price oyt of the air!!