What is included in a room-by-room heat loss report?

A room-by-room report should include dimensions, window and door sizes, exposed walls, floors and roof context, construction type, insulation assumptions, emitter notes, ventilation context, supporting photos and the calculation output.

Is this just thermal imaging?

No. Thermal imaging can support the evidence where it is useful, but heat pump sizing depends on room-by-room measurements, fabric assumptions, glazing, ventilation and clear calculation inputs.

Do Vertex support installer teams?

Yes. Vertex supports installers who need room-by-room calculations, measured or desktop evidence routes, visible assumptions, and reports that design teams can review.

Can you do heat loss calculations in the UK without visiting the property?

Yes, if the information is good enough. Reliable drawings, dimensions, window details, construction type, and insulation assumptions can be enough for a desktop calculation. If a site visit would materially improve the result, Vertex flags that upfront.

What information is needed?

The calculation needs room dimensions, window and door sizes, construction type, insulation assumptions, ventilation context, emitter notes and supporting evidence. Vertex either captures that on site or checks whether supplied drawings are good enough for desktop work.

Heat loss survey

Heat loss survey reports for UK installers

Domestic room-by-room calculation reports with inputs, assumptions, emitters and sizing evidence shown clearly for installer teams.

Send the drawings if you have them. We will confirm whether they are sufficient for a desktop calculation or whether a measured visit is needed, then agree the scope and price before booking.

Price a live job View sample report

Method MIS 3005-D

Room-by-room heat-load methodology.

Route Measured or desktop

Chosen from the evidence available.

Output Room-by-room report

Room data and assumptions remain visible.

Coverage Full UK coverage

Postcode and lead time checked upfront.

Room-by-room reports Heat loss calculations UK Heat loss calculator UK guide Heat pump survey company Renewable survey company

Included checks

What is included in a heat loss survey report?

A headline kW figure is only the result. Installer teams also need the room data and assumptions behind it before sizing, emitter checks, quote sign-off or handover.

Measurements

Rooms, openings and exposed areas

Room sizes, ceiling heights, windows, doors, exposed walls, floors and roof context are measured or checked against supplied drawings.

Fabric

Construction and insulation assumptions

Wall type, floor type, loft insulation, glazing and unknowns are shown clearly so a designer can see where evidence ends and assumption begins.

Heating context

Emitters and design notes

Radiator or underfloor heating context, flow-temperature concerns and room load notes help installers judge whether the design route is realistic.

Report output

Room-by-room report

The finished report shows results, visible inputs, assumptions and supporting evidence instead of leaving the office with one unexplained number.

Thermal imaging can help where it explains cold spots, draughts or insulation gaps, but it does not replace measured room data. Whole-house calculators can help early estimates; design work needs evidence that can be checked.

View sample report Inputs guide Calculator vs survey Price a live job

Route choice

Measured visit, desktop calculation, or both

The right route depends on the evidence already available. Strong drawings can make a desktop calculation sensible. Weak dimensions, missing glazing detail or uncertain fabric usually need a measured visit.

Measured route

When the property needs fresh room data

Use this route when room dimensions, glazing, emitter notes, insulation assumptions or construction details are not reliable enough to support heat pump sizing.

Desktop route

When drawings are already strong

Plans, room dimensions, window information and construction notes can be enough when they are complete. The report still separates supplied, measured and assumed data.

Combined route

When the survey and calculation need to travel together

For ASHP work, the calculation often sits beside site evidence, photos, BUS context and installer handover notes in the same report pack.

Desktop calculation Heat pump survey Calculation guide Price a live job

Room-by-room heat loss table from the current Vertex sample report

Current report proof

See the room-by-room evidence before booking

This is taken from the current Vertex report format. Room geometry, fabric context, openings and existing emitters stay together so the installer can check the inputs behind the calculation instead of receiving one unexplained figure.

Sample report Download PDF

Report quality

What the report needs to make clear

A good report reduces doubt. It should be obvious what has been measured, what has been supplied, what has been assumed and what still needs review.

Inputs

Measured and assumed data separated

Room measurements captured to the agreed scope
Window, door and construction details where they affect the result
Photos and notes where an assumption needs backing up

Review

Numbers the office can explain

No pretending guessed data is measured data
Constraints and unknowns stated plainly
Easier to defend the result to design, install and homeowner

Handover

One report people can work from

Evidence next to the part of the job it supports
Consistent naming across jobs
Less chasing between files, screenshots and messages

View sample report See deliverables Portal delivery Price a live job

Cost

Cost and scope

Guide pricing is public. Final scope depends on property size, travel, drawing quality and whether the job can be completed from supplied evidence or needs a visit.

Standalone

From £150

A standalone calculation is shown from £150 when reliable drawings, room measurements or Vertex survey data already exist.

Survey plus calculation

From £350

The combined route is shown from £350. That is usually the better answer when fresh site evidence is needed.

Before booking

Scope confirmed upfront

We confirm whether desktop is realistic, what information is missing, timing and price before anything is booked.

Current guide prices are taken from the live pricing page, checked on 7 June 2026.

FAQs

Questions installers ask before booking

What is a heat loss survey?

It is the evidence-gathering work behind a room-by-room calculation: dimensions, fabric, glazing, insulation assumptions, ventilation context and any notes that affect heat pump design.

Is this for domestic properties?

Yes. Vertex supports domestic work for installer teams, using measured or desktop routes depending on the quality of the evidence available.

Can you complete the calculation without visiting?

Yes, if the information is good enough. Reliable drawings, room dimensions, window details, construction type and insulation assumptions can make a desktop route suitable.

How much does it cost?

Guide pricing starts from £150 for standalone calculation work where reliable inputs already exist. ASHP survey plus calculation is shown from £350.

Is thermal imaging included?

It can be included where it is useful and agreed in scope. It is supporting evidence, not a replacement for dimensions, fabric notes or clear calculation assumptions.

What standards are used?

We work to the relevant industry standards, including the current MIS 3005-D heat pump design standard and CIBSE guidance. The MCS Heat Load Calculator documentation explains the room-by-room method and the current reference sources.

Resources

Useful next pages

These pages answer the questions that usually come up once the calculation route, assumptions or report method need checking.