2026 educational series

Designing heat pumps into a new build

Why early coordination creates simpler, lower-temperature systems.

15 July 2026 · Reviewed 10 August 2026 · 6 min read

Why early coordination creates simpler, lower-temperature systems. This guide explains the decision points without promising that one answer fits every property.

Start before the slab and plant room are fixed

Early design reserves cylinder space, pipe routes, electrical capacity, drainage and a considerate outdoor location.

Emitters can be optimised

Well-insulated rooms and underfloor heating can support low flow temperatures when loops and controls are designed correctly.

Commission against the design

As-built fabric and flow rates should be checked so the finished system matches the assumptions.

The practical next step

Use the guide to frame your questions, then ask for evidence that relates directly to this topic, the home and the proposed system. A measured assessment turns general information into a written decision you can compare.

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Apply this guide

Connect designing heat pumps into a new build to your property

Why early coordination creates simpler, lower-temperature systems. Begin by writing down what you already know and what still needs to be measured. For this topic, use “Start before the slab and plant room are fixed” as the first evidence check and “Emitters can be optimised” as the point where assumptions should be made visible.

Ask what information would confirm or overturn the recommendation. That might be a room heat-loss figure, emitter output, controller history, fault code, annual energy record, roof or ground constraint, acoustic calculation, current scheme rule or manufacturer instruction. The relevant evidence depends on designing heat pumps into a new build, so it should be named rather than hidden behind a general assurance.

Record alternatives as well as the preferred route. If the answer changes with a lower flow temperature, different emitter, revised cylinder size, alternative outdoor position, fabric improvement or different maintenance finding, keep that option beside the associated cost and disruption. It makes later comparisons more useful and reduces the risk of selecting equipment before the scope is understood.

Prepare the next conversation

Questions for heat loss and system design

Use “Commission against the design” to decide what needs to appear in the written proposal or visit record. The document should separate confirmed findings, homeowner choices, installer responsibilities, third-party work and items that remain provisional until the site is opened up or further testing is completed.

Bring the property type, current fuel, recent energy use where available, rooms that behave differently, hot-water pattern and planned building work. For an existing system, add the make, model, settings, service history and when any symptom occurs. For a new project, add the comfort outcome, acceptable disruption and the space available for equipment.

Finally, keep the calculation, proposal, commissioning results, settings, warranties and service record together. Those documents turn designing heat pumps into a new build from a one-off decision into useful evidence for handover, adjustment, maintenance and future fault finding.

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Keep the answer testable

Before acting on designing heat pumps into a new build, ask the heat loss and system design adviser to identify the source of each important figure, the date of any changing rule and the property condition behind each assumption. Note what will be checked during survey, what can be confirmed only during installation or diagnosis, and how a changed finding would affect price, equipment choice, programme, commissioning or aftercare.