Will My Old Boiler Cope? Integrating Extensions With Existing Heating
For homeowners adding significant floor space who worry their current heating system simply won't keep up.
Meet The Whitfields
The Whitfields are adding a two-storey side extension to their home, nearly increasing its floor area by a third. Their existing gas boiler already struggles on the coldest days, and they're worried they'll need to rip out their entire heating system to cope with the extra space.
Why Bigger Doesn't Always Mean More Heating
A well-insulated, airtight extension can need surprisingly little heat to stay warm — often less per square metre than the older part of the house. In many cases, the existing system has more spare capacity than homeowners assume, once the new space's actual heat loss is properly calculated rather than guessed.
Why Bigger Doesn't Always Mean More Heating
A well-insulated, airtight extension can need surprisingly little heat to stay warm — often less per square metre than the older part of the house. In many cases, the existing system has more spare capacity than homeowners assume, once the new space's actual heat loss is properly calculated rather than guessed.
Extending Sensibly, Upgrading Selectively
Rather than replacing the whole system, it's often enough to add radiators or underfloor heating zoned separately for the new space, controlled by smart thermostatic valves — with the wider switch to a heat pump planned as a future, separate upgrade rather than an immediate necessity.
Extending Sensibly, Upgrading Selectively
Rather than replacing the whole system, it's often enough to add radiators or underfloor heating zoned separately for the new space, controlled by smart thermostatic valves — with the wider switch to a heat pump planned as a future, separate upgrade rather than an immediate necessity.
The Architect's Value
An architect calculates the actual heat demand of the extension and reviews it against the existing system's real output, giving homeowners a clear, evidence-based answer instead of an expensive guess.