It is 11 at night, there is water creeping across the kitchen floor from under the sink, and you are scrolling through plumbers on your phone with one hand while holding a towel with the other. That is exactly when people hire badly. They call the first number that answers, agree to a price they never see in writing, and find out three days later that the "fixed" pipe is dripping again.
The fix is to do a little homework before you need it, and to know which questions separate a careful tradesperson from someone who just owns a wrench. This guide covers what to check, what to ask, what a fair price looks like, and the warning signs that should make you hang up, with specific notes for the UK, the UAE and Pakistan.
First, turn off the water and buy yourself time
Before you call anyone, find your main stopcock or isolation valve and close it. Under-sink pipes and toilets usually have their own small valves too. Once the water stops, the job is no longer an emergency in most cases, and you can compare two or three plumbers instead of accepting whoever arrives first. Emergency and out-of-hours rates are almost always higher, so a leak you can contain tonight is often cheaper to repair tomorrow morning.
Check credentials: what "qualified" means where you live
Plumbing rules differ a lot from country to country, so the checks that matter change too.
United Kingdom
For general water work, look for a business on the WaterSafe register. WaterSafe brings together members of four approved contractor schemes (WIAPS, APHC, CIPHE and SNIPEF). According to WaterSafe, employed plumbers at member businesses need at least an NVQ Level 2 in a plumbing discipline plus a Water Fittings Regulations qualification, and members must carry £2 million of public liability insurance. New members are audited within their first 12 months. You can search the register by postcode.
If the job involves a gas boiler, cooker or any gas pipe, the person doing it must be on the Gas Safe Register. This is a legal requirement, and plenty of plumbers are not registered for gas. Every registered engineer carries an ID card with a seven-digit licence number. The Health and Safety Executive explains that you can enter that number in the "Check an Engineer" service on the Gas Safe Register website, which shows the engineer's photo and the types of gas work they are qualified for. You can also text "Gas" followed by the licence number to 85080.
United Arab Emirates
In Dubai, plumbing is normally done by licensed maintenance or technical services companies rather than freelancers. You can check a company on the Dubai Economy and Tourism website: under e-services, choose licence information and search by company name or licence number. The record shows whether the licence is active, when it expires and which business activities it covers. If plumbing or maintenance is not listed among its activities, ask why.
For bigger jobs such as moving pipes during a bathroom renovation, your building management (for apartments) or master developer (for villas) usually needs to issue an NOC first, and a DEWA NOC may be needed depending on the scale of the work. A good contractor will raise this before you do. One who says "no need, we do it quietly" is putting your deposit with the owners' association at risk.
Pakistan
There is no national licence that a household plumber must hold, so most hiring runs on word of mouth. Formal training does exist: NAVTTC lists a three-month NVQF Level 2 Plumber course covering pipe fitting, water supply and sanitary installation. A certificate like this is a plus, but in practice your best evidence is recent work you can see. Ask the plumber for the number of a customer from the last month, or for photos of a finished job similar to yours. For larger jobs, a registered company with an office address gives you someone to go back to if a joint fails.
Questions to ask before anyone picks up a tool
Is your price a quote or an estimate? In the UK, Citizens Advice explains that a quote is a fixed price the trader generally cannot raise unless you agree to extra work, while an estimate is a best guess. The same distinction is useful everywhere. Ask which one you are getting and have it written down, even if it is a WhatsApp message.
What does the call-out fee include? Some plumbers include the first half hour or hour of labour; others charge it on top. Ask directly.
Are parts included, and can I see the old ones? Asking to keep the replaced part is a simple way to confirm it actually needed replacing.
Is VAT included? In the UK and UAE this can change the final figure noticeably.
What guarantee do you give on the work? Get the period in writing, and ask whether it covers labour, parts or both.
Are you insured if something gets damaged? Which? suggests asking whether the insurance covers your property, not just the plumber.
What a fair price looks like (UK examples)
Prices vary by city, but published ranges help you spot a quote that is far out of line. WaterSafe's 2026 cost guide puts typical hourly rates at £40 to £70, day rates at £250 to £400, and emergency call-out fees at £60 to £120 before any extra labour. Its typical job ranges include:
Leaking tap: £60 to £120
Toilet repair: £80 to £250
Burst pipe repair: £100 to £500 or more
Outside tap installation: £100 to £300
Shower installation: £300 to £1,500 or more
Which? surveyed 25 of its Trusted Traders in November 2025 and found, for example, £45 to £200 to fix a leaky kitchen tap and £100 to £500 for an emergency burst pipe repair including the call-out. London and the South East tend to sit at the top of these ranges.
For non-urgent work, both WaterSafe and Which? recommend getting at least three quotes and comparing like with like. Fixed prices suit clearly defined jobs such as swapping a tap. Hourly charging is more honest for fault-finding, when nobody knows yet why the ceiling is wet.
On payment, Which? advises not paying more than 25% upfront for extensive work and settling the balance only once you have checked the job. For a small repair, paying in full on completion is normal.
Red flags that should make you walk away
No written price at all, or a price that "depends" with no range given.
A large cash deposit demanded before any work starts on a small job.
Pressure to decide now, such as "this price is only for today" or "your whole system needs replacing" after a two-minute look.
No landline, address or business name, only a mobile number and a first name.
Refusing to show ID or a Gas Safe card for any gas work in the UK.
Reviews that all appeared in the same week or read like the same person wrote them. Our guide on how to spot fake reviews on business listings walks through the patterns.
Talk of skipping permissions in a building that needs an NOC.
A quick hiring checklist
Close the water supply and photograph the problem.
Shortlist two or three local plumbers with recent, detailed reviews. A business directory search by city and category is a fast way to start.
Check registration: WaterSafe or Gas Safe in the UK, the trade licence in Dubai, recent references in Pakistan.
Send the same photos and description to each, and ask for a written quote or estimate.
Confirm call-out fee, parts, VAT, guarantee and insurance.
Agree payment terms before work starts.
Test the repair before paying the balance, and keep the invoice and guarantee.
If you want a wider set of checks that apply to any trade, read how to find a reliable local business and how to check if a business is legitimate before you hire.
What to do if the job goes wrong
Contact the plumber first, in writing, and describe the problem with photos. Most honest tradespeople will come back to fix their own work. In the UK, the Consumer Rights Act 2015 requires traders to carry out services with reasonable care and skill, and Citizens Advice says you can ask for poor work to be redone at the trader's cost. If the plumber belongs to a trade association, that body may offer a complaints process. Elsewhere, your written quote, payment receipts and messages are your strongest evidence, which is one more reason to get everything in writing from the start.
FAQ
Can any plumber work on my gas boiler?
Not in the UK. Anyone working on gas appliances in a home must be on the Gas Safe Register and qualified for that type of gas work. Check their licence number on the register before they start.
How many quotes should I get?
For non-urgent work, three is the usual advice from WaterSafe and Which?. Send each plumber the same photos and description so you can compare prices fairly.
Is a phone quote reliable?
Treat it as a ballpark. Which? notes that extra parts, travel and parking can add to a price given over the phone. For anything beyond a simple repair, ask the plumber to look at the job first.
Should I pay a plumber upfront?
For small repairs, pay on completion. For larger projects, a modest deposit is normal, and Which? suggests keeping it to no more than 25% of the total.
Run a plumbing business yourself? Customers check these same things, so make them easy to find. Add your business to WorldBizDir with your service areas, registration details and real job photos.
Sources
WaterSafe: Finding a Plumber
WaterSafe: How Much Does a Plumber Cost? (2026)
Which?: How much do plumbers cost
Health and Safety Executive: Check an engineer, are they Gas Safe registered?
Citizens Advice: Problem with building work, decorating or home improvements
Khaleej Times: Dubai trade licence types, application process and verification
Bayut MyBayut: Dubai property renovation process
NAVTTC: Construction sector courses (NVQF Level 2 Plumber)