Free tools
Free surveying tools and calculators
16 free calculators and checkers for damp specialists, property surveyors, landlords and housing teams, all in one directory. Each runs in the browser with no account, and most sit on the site of the app that uses the same method on site.
Last reviewed by ProSurvey Apps Limited
At a glance
- What is here
- 16 free tools in four groups: damp and moisture, building and structure, lettings and compliance, and business.
- Cost
- Free to use, with no account or download needed.
- Who they are for
- Damp and timber specialists, property surveyors and inspectors, landlords and letting agents, and housing providers.
- What they are not
- Screening and planning aids. They do not replace an inspection, calibrated measurement or professional judgement.
Start here: tools on this site
Work out what survey software is worth to you, print a checklist for your next inspection, or see what a finished report looks like.
Calculator
Survey software ROI calculator
Enter your fee, survey volume and the admin time each report takes today. The calculator shows the time you could save and the break-even point against the optional Pro subscription, from your own numbers rather than ours.
Free survey and inspection checklists
Printable checklists for property, inventory and damp and mould inspections.
Sample survey report examples
Clearly labelled fictional reports showing the layouts DampApp Pro and PropertySurvey Pro produce. They are not inspections or professional advice.
Damp and moisture tools
For condensation, mould and ventilation questions. DampApp Pro has condensation, dew point and U-value checks and ventilation testing built in, so the same working goes into the survey report on site.
- dampapp.pro
Dew point and building moisture calculator
Works out the dew point, vapour pressure, absolute humidity and surface water activity from air temperature, relative humidity and the coldest surface temperature, to show how close a wall or window reveal is to condensation.
For: Damp surveyors and landlords
- dampapp.pro
U-value and interstitial condensation risk calculator
Calculates the U-value of a wall, roof or floor build-up and checks the risk of condensation inside it month by month, using the Glaser method in BS EN ISO 13788 with climate data for any location.
For: Damp specialists and surveyors assessing insulation
- dampapp.pro
Hygrothermal moisture risk calculator
Runs a simplified hourly, year-long moisture simulation of a build-up with hygroscopic buffering, for a closer look when a monthly Glaser result is borderline (it is not a full BS EN 15026 simulation).
For: Damp and retrofit specialists
- dampapp.pro
Extractor fan and ventilation rate calculator
Checks a measured extractor fan rate against the Approved Document F minimums, converts litres per second to air changes per hour and sizes purge ventilation.
For: Damp surveyors investigating condensation and mould
- propertysurvey.pro
Whole-dwelling ventilation rate calculator
Works out the whole-dwelling ventilation rate and the kitchen, bathroom and utility extract targets under Approved Document F or ASHRAE 62.2, with air-change conversions.
For: Surveyors and landlords doing damp, mould and Decent Homes work
- dampapp.pro
Indoor air quality monitoring dashboard
Models humidity, vapour pressure excess and surface relative humidity from indoor and outdoor readings to show the condensation and mould risk in a room.
For: Landlords and surveyors gathering evidence on a damp complaint
Building and structure tools
For the measurements and classifications you make on site. PropertySurvey Pro builds five of these checks (crack category, knotweed, stair geometry, roof pitch and floor area) into the app as on-site tools that write into the report.
- propertysurvey.pro
Crack damage categoriser (BRE Digest 251)
Turns a measured crack width and site observations into a BRE Digest 251 damage category from 0 to 5 with a suggested next step; it records severity, not the cause of movement.
For: Surveyors recording cracking in masonry
- propertysurvey.pro
Floor area and IPMS calculator
Totals room measurements on a GIA, GEA, NIA or IPMS basis with deductions, in metric or imperial, and exports a schedule of areas.
For: Surveyors, valuers and agents
- propertysurvey.pro
Roof pitch and rafter calculator
Converts rise and run into roof pitch in degrees, X-in-12 and ratio, and gives the common rafter length and the slope factor for working out true roof area.
For: Surveyors, roofers and estimators
- propertysurvey.pro
Stair compliance checker
Checks riser, going, the 2R + G rule and pitch, worked out from the floor-to-floor height, against Approved Document K and other regional building codes.
For: Surveyors, inspectors and builders
- propertysurvey.pro
Japanese knotweed category tool
Maps what you see on site (live or treated growth, distance to the building and any damage) to the four RICS 2022 management categories, A to D, with the usual next steps.
For: Surveyors and valuers reporting knotweed
Lettings and compliance tools
For landlords, letting agents and social housing teams. The Awaab's Law calculators are planning aids for social housing in England: they skip weekends but do not adjust for bank holidays, and they are not legal advice.
- propertysurvey.pro
Decent Homes readiness checker
Screens a rented home against the Decent Homes Standard criteria and HHSRS Category 1 hazards, then gives a score and an action list to work through.
For: Private landlords and letting agents
- dampapp.pro
Awaab's Law timeline calculator
Plans the Awaab's Law investigation, written-summary and safety-work deadlines from the date the landlord became aware of a hazard and the date the investigation concluded.
For: Surveyors working for social landlords in England
- housingsurvey.pro
Awaab's Law deadline calculator
Calculates the same statutory deadlines, including the emergency-hazard track, for teams tracking damp and mould cases across a housing stock.
For: Housing associations, councils and their contractors
Business tools
For deciding whether a piece of software, or a piece of work, is worth the time.
- prosurvey.app
Survey software ROI calculator
Estimates the time and money survey software could save from your own fee, survey volume and admin time, and shows the break-even point against an optional Pro subscription.
For: Independent surveyors and small survey firms
- propertysurvey.pro
Commercial dilapidations cost estimator
Gives an illustrative end-of-lease dilapidations figure from floor area, asset type and repair condition; it is a planning figure, not a costed schedule or a claim value.
For: Surveyors and commercial landlords
Want the full toolkit for one app? Browse the DampApp Pro damp and condensation tools or the PropertySurvey Pro surveying tools.
How to use survey calculators well
A calculator is only as good as its inputs and the judgement applied to its answer. Four habits keep the results useful in a report.
1. Measure, then calculate
Take temperatures, humidity and moisture readings with calibrated instruments, and note which instrument you used.
2. Check the edition
Standards and Approved Documents are revised. Confirm the figures against the edition that applies to the building and the work.
3. Screen, do not diagnose
A crack category or a condensation risk points to what needs investigating. Refer structural movement to an engineer where needed.
4. Record the inputs
Put the date, readings and assumptions in the report next to the result, so anyone reading it can follow the working.
Choosing software to run these checks on site? Read the guide to choosing survey software, see all three survey apps, or look up a term in the survey glossary.
Free surveying tools: common questions
Are these surveying tools free to use?
Yes. Every tool on this page is free to use in a web browser and none needs an account. They are published by ProSurvey Apps Limited on the sites of the apps that use the same methods: dampapp.pro, propertysurvey.pro, housingsurvey.pro and prosurvey.app.
Can I rely on a calculator result in a survey report?
Treat the result as a screening or planning aid, not a conclusion. Take the inputs with calibrated instruments, check the figures against the current edition of the standard, and apply your own professional judgement. A crack category, for example, records how severe the damage is but not what caused it.
Which tool should I use to check condensation risk?
Use the dew point calculator for surface condensation on a wall or window reveal, the U-value and interstitial condensation risk calculator for moisture inside a wall build-up, and the hygrothermal moisture risk calculator when a monthly Glaser result is borderline. The ventilation rate calculators check extract rates against Approved Document F.
Are the same calculations available inside the apps?
For most of them, yes. DampApp Pro includes condensation, dew point and U-value checks and ventilation testing. PropertySurvey Pro includes five on-site tools for crack category, Japanese knotweed, stair geometry, roof pitch and floor area. Both apps work offline and put the results into the PDF report, which you review before it goes out.
Where can I find free survey checklists and sample reports?
Free printable survey and inspection checklists are at prosurvey.app/checklists/, and fictional sample reports from DampApp Pro and PropertySurvey Pro are at prosurvey.app/reports/. Both are free and need no account.
Run the same checks on site, offline
DampApp Pro and PropertySurvey Pro put these calculations into the survey itself and produce the PDF report on the device. Both are free to download and use for real surveys. Pro is optional.
Compare the plans on the pricing page.