How much does commercial drain unblocking cost? UK trade pricing guides put commercial drain jetting at £200-£600+ per job in 2026, against £150-£300 for the equivalent residential work, with commercial CCTV surveys at £300-£800+ depending on pipe length and complexity (Trade2Base). Those are market figures, not TrueFlow’s price list: TrueFlow’s commercial drainage rates start where the domestic ones do, with jetting from £150 including VAT at pressures up to 4000psi, CCTV surveys from £120 and emergency call-outs from £120, and the exact price for your site is agreed before any work starts.
This guide covers what pushes a commercial drainage price above its domestic equivalent, what the market charges for the common scenarios, how planned maintenance contracts are actually priced, and what a proper commercial quote should contain before you sign anything.
Blocked drain closing part of your premises? TrueFlow attends commercial sites across Bracknell and Berkshire 24/7, 365 days a year, with a 60-minute emergency response target. Call 0808 175 7440.
Why commercial jobs price differently
The water and the blockage behave the same in a restaurant as in a kitchen at home. The price differs because of everything around the pipe:
Pipe diameter and run length. Commercial foul and surface water systems use larger-diameter pipework over longer runs than a house, so drain jetting takes more hose, more passes and more time. This is the main reason the trade’s commercial jetting band (£200-£600+) sits above the residential one.
Access and trading hours. A manhole in a service yard is quick to reach. A stack inside a fitted-out retail unit, a riser cupboard on the fourth floor, or a chamber under parked delivery vehicles is not, and a visit scheduled around trading hours or kitchen service narrows the working window.
Site paperwork. Many managed sites require risk assessments and method statements before work starts, plus sign-in, induction and permit-to-work procedures. None of it is unreasonable, and all of it is time the quote has to cover.
Scale and consequence. A business with one failing drain often has three more on the same ageing run, and a blockage that closes a kitchen or a toilet block carries a commercial cost well beyond the invoice. That is why much of this work shifts from reactive call-outs to planned maintenance, covered below.
Typical commercial scenarios and what drives the price
The only commercial-specific market ranges published by the trade guide above are jetting at £200-£600+ and CCTV surveys at £300-£800+; within those bands, the scenario sets where a job lands.
Restaurant or commercial kitchen stack. Fat, oil and grease are the dominant blockage cause, and hardened grease needs high-pressure jetting rather than rods. Expect pricing toward the middle of the commercial band when the kitchen run is long or the deposit is old, and a strong recommendation to move onto scheduled jetting, because a grease-loaded pipe re-blocks on a timetable.
Retail unit. Often the simplest commercial job: a single stack, a staff toilet and a short connection to the main run. With good access, pricing can sit near the top of domestic rates rather than deep into the commercial band.
Office block soil stack. Multiple floors feeding one stack means the blockage affects every level above it, and access is usually through riser cupboards and ceiling voids. Time on site, not equipment, is what moves this price.
Car-park and yard gullies. Priced by the number of gullies and the silt load in each rather than by blockage, since the job is usually preventative emptying and jetting before winter rather than a response to flooding. No published per-gully market rate held up to checking, so insist on a per-gully or per-visit price in writing.
Interceptor and separator jetting. Petrol interceptors and silt traps need periodic cleaning, with cost driven by chamber size, silt depth and how the waste is disposed of. These are quoted per asset after inspection, not sight unseen over the phone.
Drainage maintenance contract cost: what actually drives a PPM quote
Searches for a flat “drainage maintenance contract cost” rarely find one, because no flat rate would mean anything. The same trade pricing guide lists annual drain maintenance contracts at £150-£400 per year for domestic properties only, and states plainly that commercial contracts price separately per site (Trade2Base).
A commercial planned maintenance quote is built from:
- Visit frequency. Quarterly jetting for a busy kitchen, annual for a low-use office, gully runs before winter.
- Assets on site. How many stacks, gullies, interceptors and grease traps the schedule has to cover, and their condition at the start.
- Reporting. Whether each visit produces a condition report with footage, which facilities managers and insurers increasingly expect.
- Response cover. Whether the contract includes priority emergency response between planned visits.
TrueFlow prices planned maintenance individually, free survey first, so the schedule reflects what is actually underground rather than a template. Facilities and property managers can see how multi-site cover works on the offices and facilities management page.
Emergency versus planned rates
Out-of-hours work carries a premium across the trade. UK market data puts emergency out-of-hours call-outs at £180-£350 against £80-£150 standard, a 1.5x to 2x multiplier (Trade2Base), and consumer aggregator MyJobQuote lists standard-hours call-outs at £50-£100, roughly doubling out of hours (£100-£200).
For a business there is a twist: out-of-hours is often the planned option, because a 6am jetting visit costs less than a jetting visit plus a closed lunchtime service. TrueFlow answers 24/7, 365 days a year, with emergency call-outs from £120 including VAT and the price for any visit, scheduled or urgent, agreed before work starts. A kitchen that keeps re-blocking is cheaper to put on a schedule than to rescue, as the domestic arithmetic in our drain unblocking cost guide also shows.
Grease management costs
Any premises producing food waste needs its grease trap emptied and cleaned on a cycle, and the waste is legally controlled: every collection should come with a Waste Transfer Note from a registered waste carrier. No UK-wide per-visit market rate for trap emptying survived source checking, because pricing scales with trap capacity in litres, fill level, access and collection frequency, so treat any flat national figure with suspicion.
TrueFlow empties and cleans grease traps and hands the Waste Transfer Note over before the engineer leaves; the firm holds Upper Tier waste carrier registration CBDU538687. Ask any contractor for their carrier registration number before waste leaves your premises; without the paperwork, liability for fly-tipped grease waste can track back to the producer.
How to compare commercial drainage quotes
Cheap and expensive quotes often describe different jobs. Before comparing numbers, check each quote states:
- Whether VAT is included. Quotes that exclude VAT understate the bill by a fifth.
- Scope in assets and metres. Which stacks, runs and gullies are covered, not “drains”.
- Equipment and pressure. Ask what machine is coming: pressures up to 4000psi are what hardened commercial grease actually needs.
- RAMS and compliance documents included, not charged as extras.
- Waste documentation for anything leaving site, with the carrier’s registration number.
- Reporting. Whether you receive footage and a written condition report.
- A guarantee and insurance. TrueFlow work carries a 6-month guarantee and engineers are fully insured.
- What happens if it cannot be cleared. TrueFlow’s unblocking is No Fix, No Fee: if a blockage cannot be cleared because the pipe has collapsed, you pay only for the survey and diagnosis, never the failed attempt.
A quote missing half this list is not cheaper; it is unfinished. Current rates for every TrueFlow service are published on the pricing page.
Commercial drainage cost FAQs
How much does commercial drain jetting cost in the UK?
UK trade pricing data puts commercial drain jetting at £200-£600+ per job in 2026, depending on access, pipe diameter and run length, compared with £150-£300 for residential jetting. TrueFlow’s jetting starts from £150 including VAT at pressures up to 4000psi, with the exact price for the site agreed before work begins.
How much does a drainage maintenance contract cost?
There is no standard UK rate for commercial drainage maintenance contracts; trade pricing guides list £150-£400 per year for domestic contracts and note that commercial contracts are priced separately per site. The quote depends on visit frequency, the number of stacks, gullies, interceptors and grease traps covered, reporting requirements and whether emergency response is included. TrueFlow quotes planned maintenance per site after a free survey.
Do commercial drainage companies charge more out of hours?
Yes. UK market data shows out-of-hours drainage work typically costs 1.5 to 2 times standard rates, with emergency call-outs at £180-£350 against £80-£150 in normal hours. For businesses, early-morning or overnight planned visits can still be the cheaper option overall because they avoid closing during trading hours. TrueFlow’s emergency call-outs start from £120 including VAT, 24/7, 365 days a year.
How much does grease trap emptying cost?
No reliable UK-wide per-visit figure is published, because grease trap emptying is priced by trap capacity in litres, fill level, access and collection frequency. Every collection should include a Waste Transfer Note from a registered waste carrier. TrueFlow empties and cleans grease traps with Waste Transfer Notes supplied as an Upper Tier registered waste carrier (CBDU538687), priced per site once the trap and schedule are known.
If a drain is slowing a kitchen, a toilet block or a loading yard anywhere around Bracknell, Wokingham, Reading or the wider Berkshire area, call TrueFlow on 0808 175 7440 for a fixed price on the clearance, or a free site survey to price a maintenance schedule properly.