Builder OS
Start free
NewVariations your clients sign from their phone

Quotes that win the job,
built in minutes.

Builder OS is the operating system for UK renovation companies. Spreadsheet-fast quoting, client sign-off, stage payments and invoicing — with your projects, team and pipeline in the same place.

Start freeBook a 20-min demo
Free plan, foreverNo card neededUK VAT built in
Sarah Okafor accepted Q-1042
Signed on mobile · deposit invoice sent
01 — Quoting

Everything you liked about Excel. None of the Sunday nights.

Build a quote the way you already think: rows, sections, quantities, rates. Builder OS does the maths, keeps your margins honest, and turns it into something your client actually enjoys reading.

Type, tab, done

Keyboard-first grid with formulas, sections and per-line markup. Paste straight in from your old spreadsheet.

#ItemQtyRateTotal
2.2Cavity wall, facing brick28165.00£5,313
2.3Warm flat roof, EPDM22138.00£3,491
2.4Roof lantern 2.5 × 1m12,400.00£2,592

Price it once, reuse it forever

Save services and whole bundles to your library. Pull them into any quote, then tweak the rate for that job.

Plaster skim, wallsm²£14.00
Standard bathroom refitbundle£6,850
Double socket, new circuitpoint£145

Send a link, not an attachment

Clients open your quote on any device, ask questions on a line and sign in two taps. You see the moment they open it.

builderos.app/q/hale-sons/1042Copy
Sarah signed the quoteJust now
Ben commented on 3.2 Worktops2h ago
Opened for the third timeYesterday

PDFs that look like you

Your logo, your terms, your payment schedule. Line notes come along too, so nothing gets lost between the visit and the build.

02 — Take a look around

One login for the office, the site and the client.

Open the live demo

Sections, formulas, per-line markup and notes — with your margin always in view.

03 — After the yes

Variations signed before the plaster's dry.

Client wants the socket moved? Log it on site in thirty seconds. They get a notification, approve it in their portal, and it lands on the next stage invoice automatically. No more arguments at final account.

  1. 1Log the change on site, with photos
  2. 2Client approves in their portal
  3. 3Task lands on the right person's phone
  4. 4Added to the next stage invoice

The whole job, from first call to final invoice.

All features
Variations
Capture changes on site and get them signed off the same day.
Client portal
Progress photos, documents and approvals in one tidy link.
Payment plans
Deposit, stages, retention — set once from the quote.
Invoicing
VAT-ready invoices with card and bank payments, and polite auto-chasers.
Projects
A board for every job, with tasks, files and site diary.
Team & employee app
Who's where, what they're doing, hours and certificates.
Reporting
Win rates, cash flow and margin by job, without a spreadsheet.
CRM
Every enquiry and follow-up, so good leads don't go cold.
founder photo, on site
A note from the founder

“I ran a renovation firm for twelve years. The building was the easy part. It was the quotes at midnight, the variations nobody wrote down, and chasing the last 10% that wore me out.”

We built Builder OS for firms like the one I had — five to fifty people, great at the work, held together by spreadsheets, WhatsApp groups and a lot of goodwill. It's the tool I wish I'd had: quick enough to use in the van, and tidy enough that your clients notice.

If you try it and something's missing, email me. I read every one.

Tom Ashworth
Co-founder · tom@builderos.co.uk

Firms that switched, in their own words.

“We used to lose two evenings a week to quotes. Now I do them on the iPad after the site visit, and they're out before I'm home.”
Leanne Hughes
Director, Northgate Lofts · Leeds
“Variations were where we bled money. Now the client signs on their phone and it's on the next invoice. Not one argument since.”
Marcus Reid
Owner, Reid & Co Build · Manchester
“Clients actually comment on how professional the quotes look. Our win rate went up and we haven't dropped our prices.”
Priya Nair
Operations, Fernbrook Interiors · Surrey
Read customer stories

Simple pricing. Per company, not per head.

Start free. Upgrade when the jobs start rolling in.

FreeTry it out
£0forever
3 quotes a month, the service library and client quote links.
Start free
EssentialsMost firms start here
£49/ month
Unlimited quotes, variations, payment plans and invoicing.
Start 14-day trial
ProEverything
£119/ month
Adds projects, CRM, client portal, team app, reporting and automations.
Start 14-day trial

Your next quote could go out tonight.

Import your price list, send your first quote, and see what your clients make of it. Free while you try.

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