Double Storey Extension, what should we do first?

[edensparkles]

Hey,

Double storey extension being build in the spring, but we want to replace all the rads in the rest of the house and get a new boiler. Should we do that before the work even starts? Or are we ok to do it during the build?

No wait until you have the extension - you might decide on a different position for the boiler / might need a different one for bigger house (more radiators) that you have now. Extension might mean radiators in existing rooms need to move.

Do it with the build. You need to figure out how much extra square footage you will have because that will determine how powerful a boiler you need, and you’d want all the radiators to be the same.