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For installer companies

Heat Loss Calculations for Installer Companies

Outsourced MIS3005-D and CIBSE-compliant heat loss calculations for UK heat pump installer teams. Room-by-room outputs delivered next day when ordered alongside an ASHP survey.

15,000+ surveys completed by our lead surveyor. Treated as design-grade evidence, not a tick-box document. Documented assumptions so your design team can sanity-check inputs against the building.

Get installer pricing View sample pack

From £150 alongside an ASHP survey. Standalone heat loss from supplied measurements quoted on scope. Volume rates available for installer companies booking regularly.

Coverage: England, Scotland and Wales from our Doncaster base. We confirm lead time and pricing first — nothing happens until you approve.

Survey professional capturing measurements for an outsourced installer heat loss calculation

Calculation arm for heat pump installer companies

Vertex is a survey-only specialist. We do not sell or install heat pumps. That means installer companies can outsource heat loss calculation work without losing the customer relationship or compromising design control. Outputs are produced to MIS3005-D and CIBSE standards with room-by-room detail and documented assumptions — the design team can verify every input against the building.

Why installer companies outsource heat loss

Three reasons heat pump installer teams stop calculating in-house

Heat loss calculations consume design-team capacity that's better spent on system design and grant paperwork.

Capacity

Free your designers for design

  • Calculations done in-house tie up your most expensive technical people
  • Vertex absorbs the calculation workload and supplies design-ready inputs
  • Volume can scale up or down without hiring or firing
Compliance

MIS3005-D and CIBSE every time

  • Produced to MCS-recognised standards
  • Room-by-room output with documented assumptions
  • Designed to support BUS grant and MCS installer documentation
Defensibility

Inputs traced to evidence

  • Every U-value assumption documented
  • Internal temperatures and air change rates explained
  • Designed to hold up under MCS audit review
What you get

A heat loss output your design team can work from immediately

The exact deliverables depend on scope. The structure is consistent across every job.

Room-by-room

Per-room heat loss in watts

  • Each room calculated to MIS3005-D
  • Internal design temperature documented per room
  • Total dwelling heat loss summary
Fabric inputs

Documented U-values and assumptions

  • Wall, floor, ceiling, window and door U-values
  • Air change rates per room with reasoning
  • Notes on building fabric observations from the visit
Design-ready

Outputs for system sizing

  • Whole-property design heat loss for heat pump sizing
  • Per-room load to support emitter sizing
  • Notes on the rooms most likely to limit performance
View sample pack See full deliverables list Pricing How the portal works Get installer pricing
How it fits

How Vertex slots into a heat pump installer workflow

Most installer teams plug Vertex in between sales and design. The handoff is the same shape every time.

1. Book

Send us the job

You send the address, scope, and any deadline pressure. We confirm timeline and quote against scope before any visit is booked. Bundles with the ASHP survey for fastest turnaround.

2. Measure

We attend and measure

Our surveyor attends and captures every input needed for the calculation: room dimensions, fabric observations, air change context, and the photos that justify the U-value assumptions.

3. Deliver

Calculation lands next day

The room-by-room output is delivered the day after the site visit when bundled with an ASHP survey, ready for your design team to drop straight into emitter and heat pump sizing.

How the portal works View sample pack Heat loss inputs guide Get installer pricing
Coverage

Heat loss calculations across England, Scotland and Wales

Based in Doncaster, covering UK heat pump installer companies nationwide. Travel is included in the per-job quote.

Related services

Other services for installer companies

Vertex covers the full survey scope renewable installers need before design and install.

FAQ

Outsourced heat loss calculations: installer company questions

Yes — heat loss calculations are one of our three core services. We work as the calculation arm for UK heat pump installer companies that need MIS3005-D and CIBSE compliant outputs without tying up an in-house technical person. The calculation is delivered the day after the site visit when ordered alongside an ASHP survey.

Our heat loss calculations are produced to MIS3005-D, the MCS standard for domestic heating system design, and the CIBSE Domestic Heating Design Guide. Outputs are room-by-room with documented assumptions for U-values, internal temperatures and air change rates so the design team can sanity-check inputs against the building.

Heat loss calculations are delivered the day after the site visit when ordered alongside an ASHP survey. Standalone calculations from supplied measurements are turned around in the agreed window confirmed before booking.

Heat loss calculations start from £150 when ordered alongside an ASHP survey. Standalone calculations are priced based on property size and the level of measurement evidence supplied. Volume rates available for installer companies booking regularly.

Yes, we can produce a heat loss calculation from supplied plans and measurements, but we recommend a site visit for MCS-grade outputs because air change rates and building fabric assumptions are hard to verify without seeing the property. We will flag any assumptions that need confirming on site.

Yes — our heat loss calculations are produced to MIS3005-D and CIBSE standards and are designed to support Boiler Upgrade Scheme grant applications and MCS installer documentation requirements.

Heat loss calculations sit at the centre of our ASHP survey workflow. Our lead surveyor has completed over 15,000 renewable energy surveys, with heat loss work forming a substantial share. The calculation is treated as design-grade evidence, not a tick-box document.