DIY vs Pro: When to Call a Tradesperson (UK 2026)
An honest list of what you should be doing yourself and what you should absolutely pay a professional for.
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The golden rule
There is a line between the DIY you should be doing and the work you should never touch, and most UK homeowners draw it in completely the wrong place. People who would happily rewire a chandelier will pay a plumber £80 to change a tap washer. People who would pay a plasterer £250 to fill a hole will have a go at knocking down an internal wall because "it looks structural but probably isn't".
This is the honest list. Ten jobs — five you should absolutely do yourself and save the money, five you should never go near no matter what a YouTube tutorial suggests. And the rule that separates them: the cost of getting it wrong. If the worst case is a small mess and a tradesperson coming in to fix it, crack on. If the worst case is flooding the house, electrocuting someone, or losing your home insurance, pay the professional.
Jobs you SHOULD do yourself
1. Changing a tap (kitchen or bathroom, like-for-like)
Isolate the water at the stopcock, undo the old tap with a basin wrench, swap the connectors over, seal with PTFE tape, reconnect. Takes 30–45 minutes. The only thing that goes wrong is over-tightening and cracking a ceramic basin, which you can avoid by going hand-tight plus a quarter turn.
Tools needed: basin wrench, PTFE tape, adjustable spanner. See our DIY plumbing tools guide.
What a plumber would charge: £70–£120 for the same job. DIY saves you at least £50.
2. Replacing a toilet seat
Two wing nuts under the bowl, lift the old seat off, sit the new one on, tighten the wings. Ten minutes if you can find the right-size seat (measure the bolt hole spacing before you buy).
Tools needed: Nothing. Most new seats come with plastic wing nuts you tighten by hand. Maybe a pair of pliers if the old one is corroded.
What a handyman would charge: £40–£60 call-out. DIY saves the entire fee.
3. Painting a wall (or a whole room)
Prep is 80% of the job. Fill holes, sand, mask edges, sheet the floor. Then two coats with a decent roller — the paint itself is the easy part. A 12–15m² room takes one full weekend if you do it properly, including drying time between coats.
Tools needed: Good rollers and brushes (not the cheap ones — Purdy or Harris), dust sheets, FrogTape masking tape, filler, sandpaper. See our best dust sheets guide.
What a decorator would charge: £400–£600 per room. DIY saves £350+ per room, and the skill scales.
4. Changing a smoke alarm (replace sealed 10-year unit)
If the alarm runs on a sealed 10-year battery (not hardwired to the mains), swapping it is a screwdriver job. Unscrew the base from the ceiling, note any wiring (there shouldn't be any on battery models), mount the new base, click the new alarm in. Five minutes.
Tools needed: Screwdriver, stepladder, new BS 5446 smoke alarm. See our smoke alarm guide.
What an electrician would charge: £60–£90 call-out for a five-minute job. DIY every time — unless it is mains-wired, see the Pro section below.
5. Bleeding radiators and topping up boiler pressure
Radiator at the top cold and the bottom hot means trapped air. Bleed key, slow quarter-turn on the valve, hold a cloth under to catch the drip, close when water comes out steady. Job done. Then check the boiler pressure gauge — if it has dropped below 1.0 bar, use the filling loop under the boiler to top it back up to 1.2–1.5 bar.
Tools needed: Radiator bleed key (50p from any merchant), cloth. That's it.
What a plumber would charge: £60–£100 for the same 15-minute job.
Jobs you SHOULD NEVER DIY
1. Anything involving gas
This is the clearest line in UK law. Under the Gas Safety (Installation and Use) Regulations 1998, it is a criminal offence for anyone not Gas Safe registered to work on domestic gas installations. That includes moving a boiler by a centimetre, changing a cooker, fitting a gas hob, or servicing anything. Insurance will not pay out on DIY gas work gone wrong, and CO poisoning kills around 30 UK residents a year.
Call instead: Gas Safe registered engineers in Kent, or our Kent plumbers who cover gas work.
Why DIY goes wrong: A tiny leak on a push-fit connector you made yourself, slowly filling the kitchen while you are at work. People die from this every winter in the UK.
2. Fixed electrical work (rewiring, consumer unit, new circuits)
Part P of the Building Regulations in England and Wales requires that any work on fixed electrical installations in kitchens, bathrooms or outdoors, and most work adding new circuits, must be carried out by (or certified by) a registered electrician. It is not illegal for a homeowner to attempt the work, but it is illegal to sell or let a property where Part P work has been done without proper certification, and your building insurance can be voided.
Call instead: A NICEIC-registered electrician or Part P electrician in Kent.
Why DIY goes wrong: House fires from overloaded or miswired circuits, electrocution when a DIY socket is wired to a lighting circuit, and — more commonly — failing the electrical inspection when you try to sell the house in five years.
3. Structural work — removing walls, chimney breasts, load-bearing anything
If the wall holds anything up, you need a structural engineer to specify a steel beam (RSJ) and a builder to install it with proper props. Getting this wrong sends the upstairs floor to the downstairs floor, sometimes weeks later after the remaining masonry has slowly given up. This has happened to homeowners in Kent in the last year — the repair bill runs into tens of thousands.
Call instead: Kent builders and a local structural engineer. Budget £2,000–£5,000 for a single-wall removal job including the engineer's calcs and building control sign-off.
Why DIY goes wrong: The homeowner cannot see which wall is load-bearing from below, takes it out, and the ceiling drops. Or the wall removal itself is fine, but no building control inspection means the job was never signed off — and the next buyer's solicitor catches it and knocks £15,000 off the offer.
4. Full bathroom tiling on wet areas (shower enclosure, wet room)
Tiling a kitchen splashback is fine DIY. Tiling a shower enclosure is not — and this is one of the most expensive mistakes I have seen homeowners make. The waterproofing layer under the tiles (a tanking membrane or liquid-applied waterproofing) is the part that actually stops water. Get that wrong and water gets behind the tiles, rots the substrate, and six months later the floor below develops a wet patch that costs £8,000 to fix.
Call instead: A bathroom fitter or tiler with wet-room experience — see our bathroom renovation cost guide and Kent bathroom fitters.
Why DIY goes wrong: A watched bathroom DIY video skips the tanking step or does it wrong. Six months of daily showers later, the floor below is saturated. The remediation is a strip-out, a new floor, a new ceiling downstairs and a full re-tile.
5. Roofing work — anything above head height involving tiles or flashing
Working at height on a pitched roof without proper scaffolding or a harness is one of the top causes of fatal home-improvement accidents in the UK. Add in the skill of correctly dressing lead flashing, re-bedding ridge tiles or stripping and re-felting a flat roof, and this is simply not a homeowner job. A temporary tarp while you wait for the roofer is fine (see our storm-proofing kit). Actual roof work is not.
Call instead: Kent roofers or our how to hire a roofer guide.
Why DIY goes wrong: Falls. Ladders that slip. And even if the work gets done, an improperly bedded ridge tile blowing off in the next storm and going through a neighbour's car.
The grey area
Between the clear DIY and the clear Pro list, there is a middle tier — jobs where competent DIYers can manage but many should not. Replacing a toilet (not the seat, the whole toilet). Changing a shower cartridge. Fitting a new kitchen tap. Laminate flooring. Changing a door handle. Tiling a kitchen splashback. These are all doable if you have done one or two similar jobs before — and a disaster if you are attempting your first proper plumbing or tiling job on a live bathroom.
The test is honest self-assessment. If you have never done it before, can you afford to get it wrong? If yes, go for it — it is how you learn. If it is your only toilet and you are going away next week, get a plumber.
Tools worth owning for the DIY jobs above
If you DIY even two of the five recommended jobs a year, this kit pays for itself in a single weekend:
- General toolkit — drill, screwdrivers, hammer, level, tape measure
- Plumbing tools — basin wrench, pipe wrench, PTFE tape
- Safety gear — goggles, gloves, knee pads
- First-time buyer toolkit bundle — the 8 essentials for a new homeowner
Frequently asked questions
Can I do my own electrical work legally in the UK?
You can in theory do some electrical work yourself in England and Wales — replacing a light fitting on an existing circuit, for example, is not notifiable. But any new circuit, any work in a kitchen or bathroom, and any consumer unit work must be done by or certified by a registered electrician under Part P. In Scotland and Wales there are additional rules. If in doubt, get a sparky — a £90 call-out is cheaper than a £5,000 electrical report when you sell.
What's the difference between a handyman and a tradesperson?
A handyman handles small, non-specialist work — hanging a shelf, fitting a curtain rail, changing a light bulb, filling a hole, flat-pack assembly. A tradesperson (plumber, electrician, roofer) is a specialist with relevant qualifications for their specific trade. For small jobs a handyman is cheaper (£40–£70 per hour vs £50–£90 for a specialist), but for anything involving their specialism you need the specialist.
Will my home insurance cover DIY gone wrong?
Generally yes for accidental damage, but there are significant exclusions: any work that should legally have been done by a registered professional (Part P electrical, Gas Safe, building control-notifiable structural) may not be covered if that regulation was not followed. Always check your policy — and photograph the state of things before you start.
How do I know if a wall is load-bearing?
A few rough indicators: it runs perpendicular to the ceiling joists; it goes from ground floor up to the first floor in the same position; it is typically a thicker wall than an internal stud wall. But these are just indicators — never rely on them. If you are considering removing any internal wall, get a structural engineer to survey first (£200–£400 for a domestic survey). Do not guess.