Building regulations requirement for heating control in each room?

[Great_scot_selfbuild]

We're planning our UFH as a single zone, open loop for the downstairs with only one thermostat. I've been round this a lot elsewhere and on this forum, but just before going ahead, our ASHP installer has mentioned that building control tend to want to see temperature control in each room. I've read the Building Regs Part L and it does mention zones, and there's a brief mention of low heat demand homes, but I'm asking here to find out what the lived experience is in dealing with approved building inspectors on this topic. Ours is very particular, and hard to get hold of to discuss questions like this (which I will try).

 

In short - I'm wanting to know if anyone has actually encountered this issue, if they've had to argue the case, or if there's a simple way to phrase it to demonstrate it's compliant with the BR wording (screenclip of the BR section I've found on it).

 

 

Thanks

[jfb]

Madness! Do what you are planning to do.

 

(not based on any real knowledge of building regs on this but it was fine for us)

[JohnMo]

The 150m² multiple zones I covered with a thermostat in hall and another in ensuite controlling a towel radiator (direct electric). Use the thermostat to trip the ASHP off, if I have the fire on in winter and for summer cooling. The rest is  cover by 5.20b and 5.22a. High thermal mass buffering via thick screed floor and a thermostat in a room served by the heating circuit, in my case the hall.

 

But I have a temperature sensor in each room, most are not generally used except for monitoring temperature. They are useful to understand what is happening, how your system performs, system balancing etc.

Edited Thursday at 08:27 by JohnMo

[ProDave]

The regs are quite relaxed, >150m²  only requires 2 zones, so how about one thermostat upstairs and one downstairs?

 

BC are not going to spend the time to actually make sure they do what they think they do.

[SimonD]

Building Regs do tend to be open to interpretation, but what you can lean on and discuss with your BCO if it's a problem is that in accordance with industry practice and guidance (CIBSE Domestic Heating Design Guide) for any new build, a design temperature of 21C should be used throughout the building - because of higher insulation levels and we hope, better airtightness. In this sense, adjacent rooms can be considered as a single zone: 5.21.b 

 

[Russdl]

Alternatively.
 

Buy some cheap/dummy thermostats, stick them all over the place and bin them when your house is signed off 😃
~~~

Our place is a bit smaller than yours and we only have one thermostat downstairs. Nothing was mentioned. 

[DownSouth]

We have 200sqm total, zone 1 ground floor, zone 2 on the first floor, a controller / temp probe in the hallway on each floor. 
We’ve switched them to 19, from 21 degrees and it’s comfortably warm to work in. It might need to go back up when we are eventually just sitting around 😊 but while we’re still working away inside it’s nice and warm.

We parted company with our original ASHP heating system designer because they refused to do 2 zones, wanted trv in every room and wouldn’t factor MVHR into their calculations. BC were happy with the two zones so that’s what we’ve got.

[SimonD]

44 minutes ago, DownSouth said:

ASHP heating system designer because they refused to do 2 zones, wanted trv in every room and wouldn’t factor MVHR into their calculations

 

Numpties.....