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Heat loss

Heat loss survey and heat loss calculations UK for room-by-room reports

Room-by-room heat loss calculations for UK installers, supported by measured inputs, clear assumptions, and a report your design team can review.

Choose a measured heat loss survey or a desktop route based on the drawings, dimensions, and evidence already available.

Two ways to order. We can visit the property, or work from strong drawings and measurements. Thermal imaging can be included where it adds useful evidence, but the calculation still depends on the inputs being right.

Get pricing View sample report

Guide pricing is shown online. Scope, timing, and final quote are confirmed before booking.

For method detail, use the heat loss calculations UK guide. For calculator comparisons, use the heat loss calculator UK guide. If the wider heating route is still unclear, start with the heat pump survey page.

Survey professional using measurement tools during a site assessment

What a heat loss survey checks before the calculation starts

The software is the easy bit. The hard part is getting the room data, construction assumptions, and evidence trail right before the calculation starts.

Search route

Heat loss survey, heat loss calculation, and heat loss calculation survey are linked but not identical

The survey is the evidence route. The calculation is the room-by-room output. Some installers describe the combined route as a heat loss calculation survey, especially when a site visit is needed before the numbers can be trusted.

Measured route

Heat loss survey

Use this route when the room measurements, construction assumptions, glazing, or site evidence still need checking.

Output route

Heat loss calculations UK

Use this guide when the question is methodology, inputs, standards, and what makes the calculation dependable.

Quick estimate

Heat loss calculator UK

Use this guide when someone starts with a calculator and needs to understand where quick estimates stop.

Related guides

Related heat loss guides

These guides help when you also need calculator detail, calculation standards, or fabric assumptions alongside the main service page.

Service page

Heat loss survey

This page covers the service route, pricing context, report structure, and the choice between a measured visit and desktop work.

Calculator guide

Heat loss calculator UK guide

Open the calculator guide when the job starts with an online tool and you need to understand what a quick estimate can and cannot tell you.

Method guide

Heat loss calculations UK guide

Open the calculations guide when the real question is methodology, assumptions, and what makes the room-by-room result dependable enough for design.

Fabric guide

U-value guide

Open the U-value guide when fabric assumptions, insulation proof, or wall and window performance are the parts of the job creating doubt.

If you are comparing heat loss software or apps, the tool is only part of the answer. The calculator guide covers tool-led comparisons and the portal page shows how finished reports are delivered.

Heat loss calculator UK Heat loss calculations UK U-value guide Get heat loss pricing
What you get

Heat loss calculations UK reports should show the inputs clearly

Most problems start when the number is there but nobody can see what went into it. We keep the inputs, assumptions, and outputs readable from the start.

Inputs

The inputs are clear

  • 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
Assumptions

The assumptions are visible

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

The report is easy to work from

  • One layout people can follow quickly
  • Evidence next to the part of the job it supports
  • Less chasing around between files and messages
Why it matters

Why this makes the design stage easier

A heat loss survey is supposed to reduce doubt. If the report still leaves people guessing, it has failed.

Structure

Room-by-room results that read cleanly

  • Room-by-room outputs in a familiar layout
  • Less time spent translating someone else’s notes
  • Quicker sense-checking before design moves on
Assumptions

Numbers you can explain

  • Inputs shown alongside the result
  • Constraints and uncertainties documented
  • So the answer still makes sense when someone else reads it
Less re-typing

Less rebuilding the job in another system

  • Inputs captured in the same places each time
  • Consistent naming across jobs
  • Easier to check without starting from scratch elsewhere
View sample report See deliverables Real survey examples Why installers switch Why Vertex exists Pricing Portal Get pricing
Cost

Heat loss survey cost

Guide pricing is public. The final quote still depends on scope and whether the job can be done from strong drawings or needs a site visit, but this is the live heat loss survey cost starting point.

Heat loss only

From £150

A standalone heat loss calculation is shown from £150 on the pricing page when the scope is right for that route.

Survey + heat loss

From £350

The combined survey plus heat loss route is shown from £350. That is usually the right answer when the property still needs fresh site evidence and measured inputs.

What changes the price

Scope decides the number

Property size, travel, drawing quality, and how much has to be measured on site are what usually move the quote. We confirm that before anything is booked.

Current guide prices are taken from the live pricing page, checked on 4 May 2026.

FAQs

Questions people ask before booking a heat loss survey

It is the survey work that gives the calculation any value. The job is to gather the dimensions, construction details, glazing, insulation assumptions, and room-by-room context needed to produce a reliable heat loss result for a heat pump design.

It is the combined route where the survey captures or checks the property inputs and the calculation turns those inputs into the room-by-room heat loss output. If reliable drawings already exist, the survey part may be reduced; if not, a measured visit is usually the safer route.

Because the design depends on it. If the numbers are guessed or weak, the system sizing, emitter decisions, and flow temperature assumptions are weak as well. A proper calculation gives you something you can work from and explain.

No. A heat loss calculator UK tool can be a useful early guide, but a proper heat loss survey or calculation report works from checked dimensions, fabric assumptions, and supporting evidence that design teams can actually review.

Current guide pricing is from £150 for a standalone heat loss calculation where reliable drawings, room measurements, or Vertex survey data already exist. ASHP survey plus heat loss is from £350. If a separate measuring visit is needed, survey pricing applies.

Do it when you need heat loss inputs before pricing, design, or sizing can start. If system type is still undecided, start from the heat pump survey page so the route is clear first, then return for the heat loss route.

A typical site visit takes around one to two hours. Once the inputs are confirmed, the calculation is usually turned around the next day. Desktop jobs can move just as quickly if the supplied information is complete.

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, we will tell you before you book.

We work to the relevant industry standards, including MIS 3005-D and CIBSE guidance, and make the inputs and assumptions visible in the report so the result is easier to review.

It can be, where it is useful and agreed in scope. Thermal imaging helps as supporting evidence, but it is not a substitute for good measurements, fabric notes, or clear room-by-room inputs.

You need room dimensions, window and door sizes, construction details, insulation assumptions, and the other basics that affect how the property loses heat. We either capture that on site or work from what you provide.

Not always. Many teams do not need another tool; they need a heat loss survey report with visible inputs, assumptions, and photos that can be reviewed quickly. The heat loss calculator UK guide is useful for software-output comparisons. This page covers the done-for-you survey route.

Report usability

Why the output is easier to review than a typical heat loss report

People do not just need the final number. They need to see where it came from quickly.

Navigation

Teams can jump straight to room data, assumptions, and supporting evidence instead of scrolling through a messy file.

Consistency

The layout stays familiar from job to job, which makes the numbers quicker to sense-check.

One report

Everyone is looking at the same report, which cuts the usual back-and-forth before design sign-off.

Read why Vertex exists View sample report
Related guides

Read these next if you are comparing methods or checking assumptions

The pages below answer the questions that usually come up once the heat loss conversation starts.

Coverage

Heat loss surveys across the UK

We work across England, Scotland, and Wales. If the job needs a site visit, we confirm travel and scope before booking. If the information is already strong enough, we can often do the calculation remotely.

Measured route

Site visit heat loss survey

  • Best when the existing information is weak or incomplete
  • Useful when room measurements, glazing, or construction details still need checking
  • Helpful when the installer wants photos and notes to support the numbers
Desktop route

Desktop heat loss calculation

  • Best when drawings and measurements are already reliable
  • Faster when the installer or homeowner can supply the inputs cleanly
  • Still useful when the main need is the calculation, not the wider survey report
Before booking

What we confirm first

  • Whether desktop is realistic or a site visit is the better route
  • What information is missing and what can be assumed safely
  • Scope, timing, and price before the job is booked
Services

Related Services

Heat loss calculations are often part of a complete heat pump survey. We also provide standalone calculations and related services.