UK Construction Firms: Which Site Staff Software Fits?

Most UK contractors end up running four kinds of system: something for site access and inductions, an HR and payroll package (including CIS for subcontractors), a project or document platform, and a field tool that records who was on site and what was done. The last is the one that settles disputes over daywork, variations and hours, and it is often still a paper sign-in book and a WhatsApp group. This guide explains which software covers which job, the rules that shape the choice, and where SnapID Mark fits on a UK site.

The real problem on UK sites

A typical main contractor or specialist subcontractor deals with:

Mixed workforces. Direct employees, labour-only subbies paid under CIS, agency operatives and specialist gangs all on one site, often changing week to week.
Several small sites at once. Refurbs, housing plots and fit-outs where nobody is going to install a turnstile.
Daywork and variations. Daywork sheets signed days after the event, and arguments about whether the gang was there for six hours or eight. Under JCT and NEC contracts, the contemporaneous record usually wins, so the quality of that record matters.
Sign-in books that nobody trusts. Names written in by the chargehand, times rounded to the hour, and a fire roll call that depends on everyone remembering to sign out.
Snagging and handover. The client says the defect was there at handover; you say it was not. A dated photo of the finished room settles it faster than anything else.

What the rules expect

This is a general summary, not legal advice. Take advice from your health and safety adviser, accountant or solicitor for your own business.

CDM 2015. The Construction (Design and Management) Regulations 2015 require the principal contractor to plan, manage and monitor the construction phase, make sure workers have a suitable site induction, and take reasonable steps to stop unauthorised people getting onto site. A reliable record of who is on site supports those duties.
CSCS and competence. CSCS cards are not a legal requirement in themselves, but most major contractors and clients require them as evidence of training and qualifications. Your system should make it easy to know who is on site; checking cards remains part of induction.
Working Time Regulations 1998. Employees and workers are covered by the 48-hour average working week (unless they have opted out), rest breaks and rest periods, and employers must keep records adequate to show the limits are respected.
National Minimum Wage. You must keep records that prove workers were paid at least the minimum wage for the hours they worked. Long days, travel between sites and unpaid early starts are the usual risk areas.
CIS and employment status. The Construction Industry Scheme governs tax deductions from payments to subcontractors. It is handled in your payroll or accounts software, not in a clocking-in app. Recording a subbie’s time on site does not by itself make them an employee, but control over how and when people work is one of the factors in employment status, so keep your policy for subcontractors separate.
Right to work. Right-to-work checks apply to everyone you employ directly, and many principal contractors ask subcontractors to confirm they have done them too.
Monitoring and biometrics. The ICO’s guidance on monitoring workers expects transparency, proportionality and usually a DPIA. Fingerprint and facial recognition clocking-in uses special category data; the ICO ordered one large employer to stop using biometrics for attendance in 2024 because less intrusive options were available. Many sites still use biometric turnstiles, but they need a proper legal basis and an alternative for those who object.

The types of software and what each covers

Type of software	Covers	Leaves open	Examples
Site access and induction	Turnstiles, card checks, inductions, fire roll call on large sites	Small and short sites; evidence of work done	Biometric or card turnstile systems
HR, payroll and CIS	Contracts, holiday, PAYE, CIS deductions and returns	Proof of who was on which site	Sage, construction payroll bureaux
Project and document platforms	Drawings, RFIs, site diaries, snagging, handover packs	Quick clocking-in that operatives will actually use	Procore, Autodesk Construction Cloud
Health and safety apps	Permits, inspections, toolbox talks, audits	Timesheets	Inspection and permit apps
GPS photo clocking-in and evidence app	Clocking in per site, dated progress, daywork, inspection and snagging photos	Payroll, CIS, drawings, programme	SnapID Mark and similar apps

On a large site with a turnstile, the access system already tells you who came through the gate. On the dozens of small and medium sites that make up most UK construction, there is no gate, and a phone-based record is the practical option.

Where SnapID Mark fits on a UK site

SnapID Mark is a phone camera app with an admin website for the business. Each photo is stamped with trusted server time (not the phone’s clock), GPS, the address, optional weather, your logo, a SnapID code and a QR code. Anyone can verify a photo online, and any edit to the file shows up.

Clocking in per site

Each site gets a centre and a geofence radius: tight for a terraced refurb, wider for a housing development or a highways scheme split into sections. Operatives clock in and out with one photo on their own phone; no selfie is required. Fake GPS apps are rejected, rooted phones can be blocked, and clocking in from a basement or a plot with no signal is recorded at the right time when it uploads. Advice on radius sizes is in geofence attendance radius.

On the admin website you see On time, Late, Missing clock-in and Missing clock-out per person per day, and you can export the timesheet to Excel for payroll or to check a labour agency’s invoice. Who is currently clocked in on a site is useful information, but do not make an app your only fire roll call unless your procedure accounts for people who forget to clock out.

Subcontractors and agency labour

Subbies and agency operatives can be invited into your workspace by link, QR code or 6-character code, or imported from a CSV. Each person clocks in with their own account, so a chargehand cannot sign in the whole gang. When they leave site, suspend them to keep their history.

Daywork, site diary and snagging

Create stamp templates with required fields such as job number, plot, level or daywork reference. Photos taken during daywork carry the time, place and gang, which makes the sheet much easier to agree. At the end of the week, filter by site and export a PDF photo report for the client or QS, or a ZIP of originals. For inspection routines, see the construction inspection photo checklist.

What it is not

Not payroll, PAYE or CIS, and no holiday or absence management.
Not a turnstile, induction or CSCS card-checking system.
Not a project platform: no drawings, RFIs or programme.
No continuous tracking; location is recorded only when a photo is taken.
No API or integrations yet, and everyone needs a smartphone and an account.

Checklist for choosing

Small sites or big sites? Gate systems suit large, fenced sites; phone clocking-in suits the rest.
Individual records. Each operative clocks in themselves, not the chargehand for the gang.
Time that cannot be altered by changing the phone’s clock.
Offline working for basements, rural plots and new builds without a broadband connection.
Evidence others can check. A client, QS or adjudicator should be able to verify a photo.
Data protection done properly. A DPIA, a clear notice, and no biometrics unless you can justify them.
Exports that fit your payroll, CIS and agency reconciliation.
Operative-friendly. If it takes more than a few seconds, it will not be used at 7:30 on a wet Monday.

Rolling it out

Start with one site and one or two gangs for a fortnight.
Complete a DPIA and issue a short notice explaining what is recorded and how long it is kept.
Set up the workspace: the site and its geofence, working hours and late threshold, and templates for progress, daywork and snagging.
Cover it at induction: two minutes on how to clock in and what to photograph.
Check the first timesheet against your sign-in book, then roll it out to other sites and invite your regular subcontractors.

Seat plans are on the pricing page. If you are weighing up face or fingerprint terminals, read face recognition vs GPS photo attendance first.

FAQ

Many sites keep one as a backup for visitors and for fire roll call. A photo clocking-in app gives you a more reliable record for operatives, but your emergency procedure should not rely on one system alone.

Can a clocking-in app check CSCS cards?

SnapID Mark does not check CSCS cards. Card checks belong at induction or in your site access system; you can photograph a card at induction if your data protection policy allows it.

Is GPS clocking-in legal for construction workers in the UK?

Generally yes, if it is necessary, proportionate and explained to workers in advance. Recording location only at the moment of clocking in is much easier to justify than tracking someone all day.

Should subcontractors clock in as well?

It is common for principal contractors to require it for site safety and to verify daywork. Keep it focused on site attendance and evidence, and leave how subbies organise their own work to them.

Procore, Autodesk Construction Cloud, Sage and other product names are trademarks of their respective owners and are mentioned for descriptive purposes only.