2025-02-11 · 6 min read · Updated 2026-10-08
Before you open a tool box, ask whether the work touches water, electricity, structural framing or gas. If it touches any of those, the answer is a licensed professional, with no real exceptions. Water under pressure and electricity at household voltage both injure and kill people who are competent in other trades, and none of that work is a good place to learn.
Before you open a tool box, ask whether the work touches water, electricity, structural framing or gas. If it touches any of those, the answer is a licensed professional, with no real exceptions. Water under pressure and electricity at household voltage both injure and kill people who are competent in other trades, and none of that work is a good place to learn.
Then ask about scale, reversibility and value at resale. A repair you can undo, that stays inside, and that costs less than one day of a pro's time is usually worth doing yourself. Something that changes the structure of the house, hides behind a finished wall, or has to satisfy an inspector or an insurer is worth paying for.
Painting and patching, caulking around windows and tubs, replacing a shower head, a faucet cartridge or a toilet flapper, re-securing a loose baseboard, and clearing a slow drain with a plunger or a snake are all reasonable DIY jobs. So is fixing exterior drainage: extending a downspout, re-grading soil so it slopes away, and sealing small cracks in a driveway or a walkway. None of them requires opening a wall or touching a live wire.
In these jobs, the worst realistic outcome is an unattractive finish or a leak you notice and fix the same day. That is what makes them good candidates: mistakes are cheap. Keep your receipts and photograph the before and after, because both help if a buyer or an insurer asks later.
Electrical work is licensed for a reason: a loose connection hidden inside a wall can overheat for months before it burns. Homeowners also routinely misjudge wire gauge, breaker size and grounding, and the failure shows up as a fire rather than a tripped breaker. On top of the safety risk, most home insurance policies exclude damage from unpermitted electrical work, so a mistake can void the coverage you are paying for.
Plumbing fails more slowly but just as expensively: a poorly soldered joint or an over-tightened compression fitting can drip inside a ceiling for weeks and rot the framing. Repairing supply lines, replacing a water heater, and reworking drains all require a permit and a licensed plumber in most jurisdictions, and for good reason. A small saving on labour is a poor trade against a flooded basement.
Get three written quotes on the same scope, and make sure each one separates labour from materials and states the timeline. Ask for the licence or permit number and check it, ask for proof of liability insurance, and ask who will actually be on site — the person quoting is not always the person doing the work. Be cautious with a large deposit; a fair schedule ties payments to completed stages.
Walk into the conversation with a clear description of the problem and a severity rating, and the quotes you get back will be much easier to compare. A photo assessment with a cost range in hand also makes it obvious when one quote is wildly out of line, which is the difference between a fair price and being taken advantage of.
These links are the published references behind the figures in this article. Costs and rules are national or provincial ranges, not a quote for your home — always confirm with a licensed contractor in your region.