GroundPin
“Before it’s covered, record it.”
Underground hazard mapping for UK construction crews. Crews record what they uncover, with a graded GNSS fix and photos, so the next crew has it. Free on iPhone and Android: 25 pins, 3 sites, no card.
A site-records tool, not a locator
What a crew uncovers is usually known for a day and then lost under the backfill. GroundPin captures it at the moment of discovery: where it was, how well the phone knew that, what it looked like, and how it was located. It works alongside utility searches such as LSBUD and NUAR. It does not locate buried services and it does not give clearance to dig.
Built for muddy gloves and patchy signal
Drop a pin and see the fix grade before you commit. Download a site before you leave signal, work offline, and photos and edits sync when you are back.
Built for the job site, not the boardroom
Graded GNSS fix
Every pin records the accuracy the phone reports and grades it: Good under 5 m, Fair 5 to under 15 m, Poor 15 m or more. It is a grade, not a survey, and the pin carries an approximate OS grid reference.
How was it located?
Record the method, any offset, the locator used, and your LSBUD or NUAR enquiry reference, plus structured depth. The next crew sees how much weight to put on the pin.
Works offline
Download sites before you go, work with no signal, and photos and edits sync later. No “failed to save” on site.
Photos with context
Annotate photos with arrows, shapes and captions. A photo that was not taken at the pin’s fix is badged “Not taken at this fix”, so nobody mistakes it for site evidence.
Sealed Contractor Pack
Export a PDF with cover, summary, maps, register, pin sheets and an evidence appendix, branded for your organisation. Pin records and photos are hashed, and moves keep the old and new coordinates. See a sample pack.
Teams and share links
Named teammates work together on sites. Subcontractors can view through a share link without taking a seat. OS Maps basemap on paid plans.
iPad and Android tablets
The same app on bigger screens, for the site cabin or the van.
Web dashboard
Review sites, pins and photos from the office, export packs, and manage the team. See below.
Pins are coloured by utility type, following common UK utility colour practice.
One PDF for the client, the principal contractor and the file
Generate the pack from the app or the dashboard whenever a site needs handing over. Packs from archived sites can still be produced on paid plans.
Contractor pack and share links, one tap from the site page
Office review, packs, and team management
Crews record on the phone. The web dashboard is where the office reviews sites, pulls packs, shares with subcontractors and manages the team.
Site page — satellite map with every pin plotted, plus pack export and sharing
Pins list — filter by utility, review photos and notes, see who is on the site
Start free. Scale to the firm.
Start free in the app. Firms that want the whole crew and the office on it start with a 90 day founding pilot, then move to a company plan.
- 25 pins, 3 sites
- 3 photos per pin
- iPhone and Android
- Works offline
- For one user
- Unlimited pins and sites
- Sign up in the app
- For small crews
- Unlimited pins and sites
- Subcontractors view through share links, no seat
- One live contract
- Unlimited crew phones and the office dashboard
- Remote onboarding and weekly check-ins
- Credited against year one if you continue
- Up to 10 active sites
- 100 GB storage
- Unlimited crew users
- Contractor Packs, share links and dashboard
- Up to 30 active sites
- 300 GB storage
- Priority support
- Everything in Company 10
An active site is any site that is not archived. Extra storage is £10 a month per 100 GB. Not VAT registered, so the price shown is the price paid. Current plans are always on groundpin.co.uk.
Before it’s covered, record it
Download the app, invite your crew, and start recording. The free plan is permanent, with no card required.
GroundPin is a site-records tool. It works alongside, and does not replace, statutory utility searches (LSBUD, NUAR), CAT scanning, trial holes, or safe digging practice under HSG47. It does not locate buried services or give clearance to dig. A pin is evidence, not a survey.
Further reading: Recording buried services on site: a practical guide; Building GroundPin: an offline-first app for construction sites; web app and SaaS development from D4N.
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