Pure Energy ProjectElectrical · Heating · Plumbing
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Underfloor heating · Chiswick W4
Old house. New extension. One properly designed heating system.
PEP designs, supplies and installs complete wet and electric underfloor heating systems for Chiswick homes. We combine the right solution for each floor within one plan built around the property, finished levels, heat source and the way each room will be used.
One coordinated team Design · installation · testing · commissioning
One house · two generations of construction
A Chiswick renovation often joins two different buildings at the same doorway. The original Victorian or Edwardian house may have suspended timber floors, shallow voids and levels that cannot be raised freely. Behind it, a new side-return or rear extension may be designed from the ground up with insulation, screed and wide garden glazing.
Those floors do not store or release heat in the same way. One generic product across both can leave an awkward step, a slow room beside a fast one or a system that is difficult to balance.
PEP begins with each construction: floor depth, insulation, heat loss, finishes, door and stair levels, manifold positions and the heat source. A screed system in the extension can then be coordinated with low-profile or joisted UFH in the retained house, with zones and controls designed as one installation.
Read our complete London underfloor heating guideSelect the system around the floor
There is no universal “best” system. The correct choice delivers the required output, protects the finish and fits the construction without creating problems elsewhere.
White water pipe is secured above insulation and incorporated into the new screed. The heated mass suits rear extensions, side returns, basements and major ground-floor reconstruction.
Insulation · pipe layout · screed · movement detailsA low-profile water system can retain a suitable subfloor. Panel, levelling layer, adhesive, underlay and finish all add height, so thresholds and adjoining rooms are checked first.
Renovations · responsive output · controlled heightWhite pipe and aluminium spreader plates sit within accessible joist bays, with insulation directing heat upwards. Structure, routes, deck and covering are resolved before installation.
Suspended floors · spreader plates · insulationElectric mat or cable can suit a bathroom or compact area where adding a water circuit would be disproportionate. Load, controls, sensor and floor sequence are coordinated together.
Bathrooms · slim build-up · dedicated controls
Design the output, not just the pipe pattern
An extension with rooflights and wide garden glazing behaves differently from protected rooms inside the original house. Kitchen units, an island and fixed cabinetry also reduce the heated area. A neat layout alone cannot prove that the remaining floor will meet demand.
We assess room demand against available floor output before finalising the system. Insulation, water temperature, pipe spacing, covering and every layer above the pipe matter. If output is insufficient, the answer may be better insulation, a revised detail or a supplementary emitter — not an optimistic promise.
The floor finish is part of the design
The visible floor determines how the heating beneath it must be designed. Porcelain and stone transfer heat readily; timber, laminate, carpet, underlay, adhesive and levelling compounds introduce different resistance and product limits.
Suspended timber floors
Where boards are already being lifted, pipe and correctly supported aluminium plates can sit between joists without adding unnecessary finished-floor height. Continuous insulation below directs useful heat into the room.
Joist direction, permitted drilling or notching, pipe routes, deck resistance and the final floor covering all affect the detail. Cutting a convenient route on site is not a substitute for resolving it before installation.
Selected rooms · controlled installation
Electric heating can be effective in a bathroom, en-suite or compact space. Its shallow build-up can be useful, but operating cost, available electrical capacity, floor sensor and thermostat arrangement must suit the application.
The heating element is electrically checked at the specified stages before the finished floor removes access. PEP coordinates the fixed supply and controls with waterproofing, tiling and the usable heated area.
Explore our Chiswick electrical serviceFrom survey to handover
Decisions move forward, testing happens while the work remains visible and commissioning begins only when the construction is ready.
We discuss rooms, drawings, finishes, the heating system, programme and the teams already involved.
New screed, retained solid floors, suspended timber and selected electric zones are identified.
Demand is considered against insulation, glazing, exposed surfaces and usable heated floor area.
Methods, manifold positions, routes, control zones and electrical interfaces enter one defined scope.
Substrates, insulation and levels are checked before panels, plates, pipe or heating elements are installed.
Wet circuits are filled, purged and pressure-tested; electric systems receive the required checks.
Manifolds, pumps, actuators, thermostats, wiring centres and heat-source demand operate as one sequence.
Circuits are balanced, zones proven and operating temperatures set for the construction and finish.
Choose by scale, construction and use
Generally stronger for whole floors, large extensions and multi-room projects. Manifold circuits can be balanced and integrated with a suitable boiler or heat pump.
Often proportionate for a bathroom or limited area where extending the water system would be unnecessarily complex.
One team across the critical interfaces
The flooring contractor needs tested pipework and an agreed heat-up sequence. The heating engineer needs correct flow and hydraulic arrangements; the electrician needs defined controls, loads and sensors; the builder needs levels before doors, kitchens and stairs are fixed.
PEP brings those elements into one scope and can connect them with our Chiswick plumbing, central-heating, boiler-installation and electrical services.
Price the real floor
Floor area is only one factor. System type, floor preparation, insulation, heat-loss information, zones, manifold position, access, controls, electrical work, heat-source alterations and finish all affect the scope.
A new screed extension and a low-profile retrofit may cover the same area but require different labour and coordination. PEP prices the actual project and states the design assumptions, Wunda equipment, installation, testing, controls and commissioning included — not a headline square-metre rate with the difficult interfaces omitted.
Local coverage
PEP undertakes planned installations across Chiswick, including Bedford Park, Turnham Green, Grove Park, Strand-on-the-Green, Old Chiswick, Chiswick Mall, Gunnersbury, Acton Green and the residential streets around Chiswick Park.
Send any architectural drawings, finish schedules or heat-loss information with your enquiry. If the design is still developing, involve us before floor levels and service routes are fixed.
Practical answers before the floor closes
Every floor plan is different, but these decisions most often shape a successful W4 installation.
For a new extension with a fully designed floor build-up, a water-based screed system is often a strong option. The final choice still depends on insulation, heat demand, finished floor, available depth and the proposed heat source.
Yes. A new screed system can be coordinated with low-profile or joisted UFH in the retained house. Floor levels, flow requirements, zoning and controls must be designed together so that the two areas operate as one heating installation.
Often, provided the existing base is suitable and the complete additional build-up is acceptable. Doors, stairs, thresholds, appliances and adjoining floor levels must be checked before selecting an overfloor system.
It depends on the method. A screed system is incorporated into a new floor, a joisted system can sit within the timber structure, and low-profile panels minimise additional height above a retained base. The final dimension includes every layer, not just the heating panel.
It can be, subject to the flooring manufacturer’s requirements, thermal resistance, temperature limits, moisture conditions and installation method. The flooring must be known before the UFH is finalised.
Yes, where the floor structure is accessible and suitable. The installation requires correctly supported heat-spreader plates, continuous insulation, structurally acceptable pipe routes and an output assessment for the deck and covering above.
Not automatically. The answer depends on each room’s heat loss and the output available from its usable heated floor. A demanding glazed room may need an improved floor design or a supplementary emitter.
Possibly. PEP assesses the boiler, system condition, hydraulic arrangement, controls and total heat demand before confirming how the new UFH should connect.
It may be possible to design with a future lower-temperature heat source in mind, but this must be supported by heat-loss calculations, suitable floor output and an appropriate hydraulic and control strategy.
PEP can coordinate the water circuits, manifold equipment, pumps, actuators, wiring centres, thermostats and electrical supplies within one project, then prove their combined operating sequence during commissioning.
Yes. Wet circuits are filled, purged and pressure-tested at the appropriate stages while they remain accessible. Electric systems also receive the relevant checks before the heating elements are concealed.
Send the W4 postcode, floor plans if available, room dimensions, photographs, intended floor finishes, information about the existing heat source and a short description of the renovation programme.
Underfloor heating · Chiswick W4
Send PEP your drawings, proposed floor finishes and project programme. We will help establish the right method for each area, the information still required and the next practical step.