Heat Pump-Ready Underfloor Heating in Dorset & Hampshire
Updated: Oct 4
Heat pumps are showing up on more and more spec sheets across Dorset and Hampshire this year, and the question we get asked on nearly every one of those jobs is the same: does it need underfloor heating to actually work well? Not always, but if you're renovating or extending, pairing the two properly is one of the best upgrades you can make to a home's running costs. Get the groundwork wrong, though, and you end up with a heat pump that never quite performs the way it should.
We fit both systems as part of our plumbing, heating and electrical work, and we've learned that the planning stage matters more here than on a standard boiler swap.
Why underfloor heating and heat pumps suit each other
A radiator system is usually designed to run at 60-70°C flow temperatures. Heat pumps can hit those numbers, but they have to work hard to do it, and efficiency drops off fast the hotter the water needs to be. Underfloor heating typically only needs 30-40°C to warm a room, which is exactly the range where a heat pump is most efficient. Put simply, a heat pump paired with wet underfloor heating can end up costing noticeably less to run day to day than the same heat pump feeding old radiators, especially over a full winter.
That's not a reason to rip out every radiator in the house. On plenty of Dorset renovations we keep radiators upstairs and add wet underfloor heating downstairs, on the ground floor rooms getting the extension or the big refurbishment, and size the heat pump to suit both.
Wet vs electric: what each one actually costs in 2026
This is where people often get confused, because “underfloor heating” covers two quite different systems with different jobs to do.
Electric underfloor heating is a thin heating mat or cable under the tiles. It's quick to fit, works well under bathroom or kitchen tiles, and is a sensible choice for a single room. It isn't really designed to be your whole-house heat source, and it doesn't pair with a heat pump in any meaningful way.
Wet (water) underfloor heating is a loop of pipe fed from a manifold, run either from a boiler or a heat pump. It's the one that actually does the job a heat pump needs it to do, but it's a bigger undertaking: insulation boards, pipe runs, a manifold, and usually a screed or a low-profile retrofit panel system if you don't want to lose too much floor height.
Based on current UK trade pricing for supply-and-fit work, uplifted to reflect what we'd actually charge on a job like this rather than a bare national average, here's roughly where the numbers land for 2026:
Electric underfloor heating retrofit: around £70-£100 per m², so a typical 20m² room comes to roughly £1,450-£2,050
Wet underfloor heating retrofit: around £115-£130 per m², putting that same 20m² room at roughly £2,300-£2,650
Older solid floors usually cost more, because there's often digging out and extra insulation to build in before pipework even goes down
We always survey the floor build-up before quoting rather than pricing from a phone call. Suspended timber floors, solid concrete, and older Victorian or Edwardian solid floors around Winchester and Salisbury all need slightly different approaches, and that changes the number.
What changes once a heat pump is involved
Adding a heat pump into the mix brings a few extra considerations on top of the underfloor heating itself.
First, the installer needs to be MCS certified for you to claim the government's Boiler Upgrade Scheme grant, which currently offers £7,500 towards an air source heat pump on an eligible property. That's a genuine saving worth checking before you commit to a system size.
Second, for a typical 3-4 bedroom home, budget somewhere in the region of £13,000-£24,000 for the heat pump supply and installation itself, with most jobs we see landing close to £18,000 before any grant is applied. The exact figure depends heavily on the unit size, how much groundwork the outdoor unit position needs, and whether existing pipework and hot water cylinders need upgrading alongside it.
Third, insulation comes first. A heat pump running low flow temperatures needs a reasonably well-insulated house to keep up on the coldest days, so we'll usually flag loft or cavity insulation as part of the conversation if a property isn't quite there yet. And the outdoor unit itself has siting rules to consider, distance from boundaries and neighbouring windows mainly, which is worth checking early if you're on a tighter plot in somewhere like Poole or Southampton.
What this looks like on a real job
A fairly typical pattern we see on a Dorset renovation: a single-storey rear extension and kitchen knock-through gets wet underfloor heating throughout the new ground floor space, tied into a new air-to-water heat pump sized for the whole house, while the existing radiators upstairs stay as they are but get rebalanced for the lower flow temperature. First fix pipework and the manifold usually take a few days once the floor's ready, then there's drying time for the screed before anyone can walk on it properly, so it needs sequencing early with the rest of the build rather than being an afterthought near the end.
Quick things people usually ask us at this stage:
Can you retrofit wet underfloor heating without losing much floor height? Yes, low-profile panel systems exist for exactly this, though they cost a bit more per m² than a standard screed system.
Do I need underfloor heating in every room? No, most jobs mix it with radiators depending on the room and the floor build-up.
Will my existing radiators still work off a heat pump? Usually yes, once they're rebalanced for lower flow temperatures, though bigger or additional radiators are sometimes needed in draughtier rooms.
Related reading
Thinking about a heat pump-ready floor?
If you're planning a renovation or extension anywhere across Dorset or Hampshire and want to know whether heat pump-ready underfloor heating makes sense for your home, we'll come and have a proper look at the floor build-up, the insulation, and the room-by-room heat loss before putting a number on it. Get in touch through completebuilds.co.uk and we'll book in a site visit.
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