Built by a commercial manager who priced steelwork for a living.

Estimating that costs less
than the estimate.

AI-powered estimating, NRM2-compliant BOQs, applications for payment, variations, project P&L, cashflow forecasting. £8 a month. Flat. No per-seat tax. No £500 implementation fee.

HBXL £54/mo·Buildxact £88/mo·CostLynx £8/mo for the lot
Join the waitlist See what's inside
First 100 get £4/mo locked in No sales call No setup fee, ever
cost-lynx.co.uk/dashboard/boq
BoQ editor — Section A · Steelwork
A · STEELWORK · STRUCTURAL FRAME4 items
RefDescriptionQtyUnitRateTotalSource
A1.1Structural steel frame — UC 254×254×73, fabricate + erect4.2t£1,850£7,770Historic
A1.2Connections — bolted, M20 8.8, including tying members64nr£28£1,792Library
A1.3Galvanising to BS EN ISO 1461, 85µm minimum4.2t£420£1,764AI · band
A1.4Crane hire — 50t mobile, day rate inc. operator2day£1,100£2,200Sub quote
Section A subtotal£13,526
Auto-saved · 12s ago·NRM2 mapped · 4/4 rates filled AI Suggest
They chargeHBXL EstimatorXpress£54/mo + £500 setupsingle-user, Windows-onlyBuildxact£99–£269/molive merchant feeds · AI takeoff immatureRIB CostX£3.5–6.5k/seat/yrBIM takeoff · enterprise onlyCauseway Estimating£2.5–4k/seat/yrUK civils strongholdCubit Estimating~£1,800/yr/seatNRM2 + CESMM · steep curveCostLynx£8/mo flatunlimited seats
Public published prices verified May 2026. Comparative ad — UK Business Protection from Misleading Marketing Regs 2008.
£8 a monthThat's the whole price list.

No tiers. No per-seat. No annual lock-in. Same software whether you price one job a month or fifty.

Built by a real QS
Not a SaaS marketing team
NRM2 + CESMM4 + SMM7
First-class measurement standards
AI rate provenance
Every rate carries its history
Encrypted at rest
Your pricing is your IP
Why it costs £8, not £80.

What you're not paying for.

The rest of the industry is stacking fees that have nothing to do with the software.

How the rest rack it up.
  • ✕
    Multi-thousand-pound annual licences.
    CostX £6.5k. Causeway £4k. Conquest £2.8k. Per seat. Per year.
  • ✕
    £500–£2,000 implementation fee.
    Pay them to install the software on your Windows machine.
  • ✕
    Windows-only desktop. 2010s UI.
    No tablet. No phone. No cloud. Your laptop dies, your pricing dies with it.
  • ✕
    Separate seats for take-off + estimate + BoQ.
    Three tools. Three subscriptions. None talk to each other.
  • ✕
    AI? Maybe in a future version.
    The incumbents are dragging spreadsheet UX into 2026 reluctantly.
  • ✕
    Sales call. NDA. Six-week onboarding.
    You signed up to price a job, not learn another bit of enterprise kit.
That's us.
How CostLynx does it.
  • ✓
    £8/mo flat. Sign up, start pricing.
    No contract, no lock-in. Same software whether you do one job or fifty.
  • ✓
    Zero setup fees. Ever.
    If you can use Excel you can use CostLynx. Onboarding is the empty BoQ in front of you.
  • ✓
    Browser-based. Works anywhere.
    Price on your laptop. Approve a valuation on your phone. Same view, same data.
  • ✓
    Take-off + BoQ + valuation in one product.
    One workflow. One subscription. Everything talks to everything else.
  • ✓
    AI rate suggest built-in from day one.
    Historic match, band check, anomaly flag — with provenance on every chip.
  • ✓
    No sales call. No demo. No NDA.
    Click "Start free", build a BoQ for a real job, decide for yourself.
AI Estimating · Day one.

Describe the work. Get a priced estimate.

Drop in the spec, the take-off, or just a one-line scope. CostLynx pulls from NRM1/NRM2 rate structures, regional labour rates, and your own historic rate library. Every line carries a provenance chip — historic match, library, AI band, sub quote.

  • NRM2-compliant BoQ structure out the box.
  • Rate provenance chips on every line.
  • AI suggests, you sign off — not the other way round.
AI estimate · steelwork frameDrafted in 12s
Spec input
“Erect structural steel frame to dwg A-101. UC 254×254×73 columns, primary beams UB 305×165×40, bolted connections, galvanised finish, crane hire included.”
BoQ output · 4 line items
Steel frame£7,770
Connections£1,792
Galvanising£1,764
Crane hire£2,200
Subtotal£13,526
Rate provenance · The moat.

Every rate carries its history.

Click any rate cell. See the matched historic rows, indexation applied, confidence band, and which job each match came from. No more guessing why a £/t number is what it is — the audit trail is on screen.

  • Three colour-coded sources: library, historic match, AI band, sub quote.
  • Indexation auto-applied (CPI, BCIS) to keep historic rates current.
  • Confidence band shown for every AI suggestion — you decide the risk.
Rate suggest · galvanising £/tCached 0.04s
£420/ tonne
Confidence band: £395 – £445 · 78% confidence
Provenance · 3 matches
Crouch End Yard · steel mezzMar 2026£415/t
Hackney Wick warehouseJan 2026£428/t
Stoke Newington gymNov 2025£419/t · indexed +1.4%
Valuations · Applications for payment.

Interim valuations that auto-total.

Each subcontractor has a contract: original sum, signed variations, agreed retention %. Every application shows gross applied, less previous valuations, less retention held, less CIS — all calculated automatically and visible to both sides. No retyping. No reconciliation.

  • Period-by-period work-done with photo evidence.
  • Auto-applies CIS deduction and retention.
  • Payment certificate PDF in one click.
Valuation 03 · sub: Pinnacle MechPeriod: May 2026
Original contract sum£142,000
Variations 1–3 (signed)+£8,400
Gross applied this period+£38,200
Less previous valuations (×2)−£64,500
Less retention held (3%)−£1,146
Less CIS deduction (20%)−£7,411
Net certified£29,143
Auto-calculated · Payment certificate generated · Visible to sub
Variations · Change orders.

Log it. Price it. Win the argument later.

Every variation captured with date, scope, price impact, and programme impact. Linked to the original BoQ item. Full audit trail — when it comes to final account, the variations register is the receipt.

  • NEC CE 8-week clock + JCT clause 5 variation register.
  • Price impact rolls into project P&L the moment it's signed.
  • Audit trail kept for the life of the project.
Variation register · Job #144 of 14 shown
CE-01414 MayAdd 6 secondary beams to mezzanine£4,250Signed
CE-01516 MayUpgrade galv DFT 85µm → 140µm£1,820Signed
CE-01621 MayCrane swap — 50t → 80t for span£1,450Pending
CE-01723 MayAdditional fire-protection coating£2,330Pending
Audit trail kept for 12 years+£9,850 to date
Project P&L · Cash flow.

Know which jobs are making money. Live.

Live profit and loss by project. Cost vs value. Margin tracking. Committed costs (PO raised = committed) hit CVR immediately, not at invoice. Cashflow curves predict when money comes in and when it goes out.

  • Live P&L per project, refreshed on every transaction.
  • Commitment accounting — PO raised = committed cost.
  • Cashflow forecasting curves per project + company-wide.
Live P&L · all active jobsLive · refreshed 4s ago
Crouch End Yard · steel mezz£84,500£142,00041%
Hampstead refurb · M&E first fix£31,200£45,00031%
Tottenham depot · roof relift£58,100£72,40020%
Camden warehouse · pad found.£28,950£31,5008%
Total cost
£202,750
Total value
£290,900
Blended margin
30%
AI Pricing Brain.

Rate provenance. Anomaly flagging. Spec reader.

Drop an ITT and CostLynx reads it. Click a rate cell and the AI proposes a number with confidence band + matched historic rows. Bid not making sense? Anomaly chip lights red. None of this is bolted on — it's built in from day one.

  • Spec reader: drop ITT PDF, get structured scope + provisional sums.
  • Rate suggest: historic match, band check, anomaly flag — with provenance.
  • Pre-submission QA: AI checks the bid for typical missing items before you send.
  • Sub-quote parser: drop a sub's PDF, get a normalised quote ready to compare.
AI · pre-submission QAJob #14 · Tender ready check
✓
17 of 17 standard line items present
Section A through E all populated
✓
CIS treatment on subbie labour lines
Auto-applied — 4 lines flagged
!
No prelim allowance for crane access
Median for jobs this size: ~£1,800
!
Galv rate (£420/t) at low end of band
Confidence 78% · band £395–£445
✓
Material indexation up to date
BCIS Q1 2026 applied
3 of 5 checks need attention
Do the maths.

Priced for a job site, not an enterprise.

Here's the typical bill a small UK contractor pays to stitch together what CostLynx does in one product.

The expensive way.
Estimating software seat£54/mo
BoQ + take-off add-on£35/mo
Project P&L / CVR tool£45/mo
Implementation + training£50/mo
Cloud sync / file-shuttle£30/mo
Typical monthly~£214
VS
SAVE £206/MO
The CostLynx way.
COST-LYNX
£8
/ month · all of it
Every module. Every workflow.
Unlimited seats, unlimited jobs.
One login. Cancel any time.
And everything else.

Every commercial workflow a UK contractor runs.

Sub procurement, CIS, retention, cost-to-complete, mobile sign-off — all included, all in one product.

Sub procurement.
Send enquiries, compare returns, award packages. Who quoted what and why you chose them — captured.
CIS management.
CIS calculated automatically, statements generated, hands off to InvoLynx for HMRC filing.
Cost-to-complete.
Where you are now vs where you need to be. Flag overruns early, not at the final account.
Invoicing.
Pro forma, interim, retention, final account. CIS-aware. Stripe pay-link on every PDF.
Retention tracking.
Held vs due, PC and DLP dates, auto-invoice on release.
Your own rate library.
AI learns your pricing. Historic rates feed future estimates. Build the database that becomes your moat.
Group ecosystem.
Projects flow in from SiteLynx. Timesheets from WorkLynx feed cost reports. Certified valuations hand off to InvoLynx.
Mobile + desktop.
Full estimating on desktop. Approve valuations on your phone. Browser-based. Works anywhere.
Part of the Lynx Group.

Add InvoLynx, your accounts side clicks in.

Certified CostLynx valuation auto-raises a sales invoice in InvoLynx with DRC + CIS treatment. SiteLynx feeds projects in. WorkLynx feeds timesheets in. One login, one bill, one ecosystem.

See InvoLynx.
FAQ.

The things every QS asks.

Straight answers. No sales pitch.

Stop paying £6,500 a year for QS software you barely open.

£8/month, flat, every module included. First 100 sign-ups get £4/mo locked in for life.

Join the waitlist
Cancel any time · 30-day money back · UK-hosted