UK builtCIS, retention & offline diary
The job file your site and office actually use
Replace WhatsApp and spreadsheets as the job file for UK builders — site diary through to invoices. Drawings, snags, CIS and handover evidence stay in one live record your site and office actually use.
No card required · £29/month after trial · Full feature list
- Offline-first diary
- CIS & retention
- Payment notices
- Drawing pins
- Client portal
- Global search
90
days free trial
Full product, no card
£29
per company / month
Unlimited seats & jobs
1
live job file
Site diary to invoice
- UK CIS & retention
- Payment notices
- Offline site diary
- Client portal
- UK hosted data
Why teams switch
Scattered tools cost you evidence and margin
Photos live on personal phones. Drawings go stale in email. CIS sits in a spreadsheet the site manager never sees. When a dispute, inspection or month-end review lands, you spend days reconstructing what happened - from people who have already left site.
SiteOS keeps the live job and the paperwork that follows in one place. Same record on Monday morning, at QS review and at handover. Search across diary entries, RFIs, drawings and invoices in seconds - not hours hunting through folders.
What you replace
- WhatsApp threadsDated site diary
- Shared drive PDFsCurrent drawing register
- Excel CIS trackerLive subcontractor status
- Camera roll photosEvidence on the job file
- Email VO chainsPriced variation register
See it in action
The real product, not a slideshow
Diary, snags and commercial views from the Oak Road demo job. Sign in as demo@siteos.uk to explore the full file.
Oak Road extension
Thursday 14 Aug
Progress
First floor joists in
Weather
Dry, light wind
Photos
4 attached
Who it's for
One job file for site, office and the owner
Site manager
- Log the diary and snags from your phone, even offline
- Pin defects on drawings and chase close-out from Home
Office & QS
- Price variations, chase invoices and CIS from the same job file
- Export evidence packs without rebuilding folders
Company owner
- One flat price for unlimited people and projects
- See overdue snags, diary gaps and cash risk on Today
How it works
From site capture to client handover
One workflow for domestic extensions, main contractor packages and small commercial fit-outs - designed around how UK sites actually run in 2026.
Capture on site
Log the diary, raise snags, pin issues on drawings - works offline and syncs when you're back on signal.
Office stays aligned
QS prices variations, office chases invoices, CIS and retention stay on the same job file as the site record.
Alerts, not noise
Overdue snags, diary gaps, insurance expiry and pay-less windows surface on Home - not buried in WhatsApp.
Handover with evidence
Export snag packs, RFIs and inspection PDFs. Share a client portal for progress, VOs and daywork sign-off.
Pilot feedback
What early teams say on live jobs
Quotes from UK builders on pilot programmes. Read the full stories.
Built for UK builders
Customer stories- Extension specialistsLofts, wraps & refurb
- Main contractorsPackages & new build
- Fit-out teamsLight commercial
- Renovation yardsHeritage & period
“We stopped losing photos in group chats. The site manager logs the diary, office sees the same snags and CIS status - month-end is half the hassle it was.”
South East extension yard · Director · pilot team
“Drawing pins and snag packs sold it for our site team. They actually use it because it works offline and does not charge per helmet.”
South Coast site team · Site manager · pilot team
“CIS and retention in the same file as the diary saved our QS hours every month. One price for the whole company is the only model that works for us.”
Midlands commercial fit-out · Office manager · pilot team
Platform
Everything in one job file - not a pile of apps
Diary, commercial, QA, H&S and handover modules share the same data. No re-keying between site and office. No per-module licensing. One company price, unlimited people and projects.
Site diary
Close of day in under ten minutes. Progress, delays, weather and photos - each entry timestamped and searchable. Offline drafts sync automatically when you're back online.
Drawing register
Upload revisions, mark one as current, send transmittals with read receipts. Pin snags directly on plans - Fieldwire-style without per-seat pricing.
Snags & QA
Filter by zone and trade, chase overdue close-out, download snag packs for PC.
Commercial
Invoices, POs, quotes, valuations, CIS and retention - UK rules in the product.
H&S & compliance
RAMS, toolbox talks, permits, inductions and NCRs with photo evidence.
Search & alerts
One search across diary, RFIs, drawings and invoices. Smart alerts on Home tell you what needs action today.
Why SiteOS
Enterprise depth without enterprise tax
Procore and Fieldwire are powerful - but per-seat pricing and long onboarding punish SMEs. SiteOS gives you the job-file depth UK builders need at one flat company price.
Pricing
One plan. Everything included.
Unlimited projects and team members for £29/month per company. Try the full product free for 90 days - no card to start. Yearly billing at £290/year saves two months.
No per-seat fees. No surprise add-ons for drawings, snags or CIS. The same price whether you have three people or thirty on site.
Monthly vs yearly breakdownSiteOS Pro
£29/mo
per company · or £290/year
- Unlimited projects & team members
- Site diary, snags, drawings & H&S
- CIS, retention & payment notices
- Invoices, POs, quotes & live CVR
- Client portal & evidence PDF exports
- Global search & smart alerts
Prefer to explore first? Open the Oak Road demo with demo@siteos.uk
FAQ
Common questions
Straight answers for owners, site managers and office teams evaluating their next job-file system.
UK builders running extensions, renovations, fit-outs and light commercial work - domestic builders, main contractors and small commercial teams who need one job file for site and office, with CIS, retention and payment notices built in.
SiteOS is priced per company, not per helmet. You get diary, drawings, snags, commercial and H&S in one UK-focused product without enterprise setup. It's built for SMEs who need evidence and margin control, not a portfolio-wide ERP.
Yes. Diary entries, snags, time sheets and several checklist flows work offline. Drafts sync when you're back on signal - critical for basements, rural sites and patchy 4G.
The full product for 90 days - unlimited projects and team members. No card required to start. After the trial it's £29/month per company, or £290/year yearly (two months free).
Yes. The client portal is a private link - progress, photos, priced variations, dayworks for sign-off and invoices. No login, no app install.
SiteOS is built for UK builders with UK-appropriate hosting and GDPR-friendly export. You can export your company data from Settings at any time.
Yes. Start a free company trial with no card, or sign in to the pre-loaded Oak Road demo job (demo@siteos.uk) to walk diary, snags, CIS and invoices in two minutes.
You choose monthly (£29/month) or yearly (£290/year). If you do not subscribe, read-only access remains so you can export - nothing is deleted without you asking.