Fixed Price or Hourly Rate: Which Is Cheaper for Drain Unblocking?

Fixed price drain unblocking is usually cheaper than an hourly rate for an ordinary domestic blockage, because you know the total before anyone arrives and the bill cannot grow while the engineer works. An hourly rate can come out lower on a very quick job, but it moves the risk of a slow or awkward blockage onto you. Which model is cheaper depends less on the headline figure than on what each one leaves out. Our own figures, set by job type and time band, are on the published rate card; this guide explains how the different pricing models work so you can compare any quote against them.

What is the difference between fixed price and hourly drain unblocking?

A fixed price covers a defined job for one agreed figure, however long it takes. An hourly rate charges for the engineer's time, normally with a minimum first hour and then smaller blocks of time after that.

With a fixed price, the company carries the risk. If the blockage takes forty minutes or two hours to shift, the price for that job does not change. With an hourly rate, you carry it. A blockage that turns out to be a compacted mat of wipes deep in the run costs more than one sitting just past the chamber, even though you asked for the same thing: a drain that runs freely.

There is a third model that sits between the two: a call-out or attendance fee, then time charged on top. It looks cheap on the phone because the first number you hear is small. The total only becomes clear once the work is finished.

Which pricing model is cheaper for a typical blockage?

For most household blockages in a sink, toilet, gully or inspection chamber, a fixed price is the cheaper or equal option once everything is added up. Hourly pricing only wins when the job is genuinely quick and the minimum charge is low.

The reason is the minimum charge. Almost every hourly rate includes at least one full hour, and many add the time spent travelling, setting up and packing away. A simple blockage cleared in twenty minutes is still billed as an hour. If it overruns, the next block of time starts. A fixed price for the same job already allows for an average amount of time, so a quick job costs the same and a slow one does not cost more.

Hourly pricing can make sense for work where nobody can know the scope in advance, such as tracing an unmapped drain run or a long commercial clean where the amount of silt is unknown. Even then, ask for a cap: a figure the bill will not exceed without your agreement.

Where do the extra charges hide in each model?

In an hourly quote, extras usually hide in the time: travel, parking, waiting for access and rounding up to the next block. In a fixed price quote, they hide in what the price does not cover.

With hourly pricing, ask when the clock starts. Some firms start it when the engineer leaves the previous job, not when they reach your door. In central London, parking and congestion charges are sometimes added as separate line items. Rounding matters too: a job that takes an hour and five minutes may be billed as an hour and a half.

With a fixed price, the question is scope. A price for "unblocking a drain" may only cover rodding from one access point, with jetting, a second chamber or a CCTV check charged as extras. A fixed price is only fixed if it describes what the job includes. That is why our rate card sets the price by job type and time band, and anything beyond that job is quoted and agreed separately before it is done, rather than added to the invoice afterwards.

Does the time of day change a fixed price?

Yes. Almost every drainage company charges more in the evening and overnight, whichever pricing model it uses. What matters is whether you are told the out-of-hours figure before you book.

Our prices sit in three bands: standard hours (7am to 5pm), evenings (5pm to midnight) and nights (midnight to 7am). The job is the same in each band; the rate is not. With hourly pricing, the uplift is often a multiplier on every hour, which adds up quickly on a long job. With a fixed price, the uplift is one known figure.

If you still have a working toilet and the blockage is only slowing things down, waiting for the next standard-hours slot is often the single cheapest decision you can make. If sewage is backing up into the property, that is a different situation and the out-of-hours rate is worth paying.

What about "no fix, no fee" pricing?

"No fix, no fee" or "no clear, no charge" means you do not pay for the clearance if the engineer cannot clear the blockage. It is useful, but it is not the same as a fixed price, and it rarely means the visit is free.

Most policies like this still charge for attendance or diagnosis, and they only apply to blockages the standard equipment is expected to clear. A collapsed pipe is not a blockage, so finding one usually ends the clearance and starts a separate quote for a survey or repair. Before you book, ask exactly what you would pay if the drain is not cleared. We explain the limits of ours in what no clear, no charge actually covers.

How do you compare a fixed price quote with an hourly one?

Turn both into a worst-case total for your job. Ask the hourly firm for a realistic time estimate and a cap, then compare that figure with the fixed price and what it includes.

Ask each company the same questions:

• Is the price fixed for the job, or charged by time? If by time, what is the minimum and in what blocks after that?
• Is VAT included in the figure you have given me?
• Is there a call-out or attendance fee on top, and does it change in the evening or at night?
• Does the price include jetting if rodding does not clear it, or is that extra?
• What happens, and what do I pay, if the problem turns out to be a damaged pipe rather than a blockage?
• Are parking or congestion charges added separately?

A company that answers those plainly before travelling is one whose invoice will match the quote. Our guide on choosing a drainage company in London covers the other checks worth making. If you want a figure agreed before anyone sets off, tell us what is blocked and when you need it, and we will confirm the job price for that time band for drain clearance.

For the wider picture of what drives the bill, see our guide to how much drain unblocking costs in London.