When to call a professional

The most useful skill in home maintenance is judging accurately which side of the line a job falls on, and the line is not where enthusiasm puts it.

What is legally restricted

Varies by jurisdiction and generally covers the same ground.

Gas work is restricted essentially everywhere to registered engineers.

This includes boilers, gas fires, cookers and any pipework.

The restriction exists because the failure modes are carbon monoxide poisoning and explosion, and it is not a formality.

Substantial electrical work is notifiable or restricted in many jurisdictions, particularly consumer units, new circuits and work in bathrooms and kitchens.

Minor work is frequently permitted; the boundary varies and is worth checking locally.

Structural alterations — removing or altering load-bearing walls, forming openings, altering roof structure — require calculations and generally building control approval.

Drainage and water supply connections beyond the property, and anything affecting a shared drain.

Asbestos removal above small quantities of certain materials, which is licensed work.

Work at height beyond a certain scale, and roof work generally.

Doing restricted work yourself risks prosecution, invalidates insurance, and creates a problem at sale that surfaces during conveyancing.

What is not restricted but should be

Where judgement matters more than law.

Anything on a roof, where falls from height are the leading cause of serious domestic injury.

Anything involving a ladder above single-storey height.

Tree work of any size, which kills experienced professionals regularly.

Anything where a mistake floods the property, such as work on a mains supply without knowing where the stopcock is.

Anything involving a material you cannot identify in a property built before asbestos restrictions.

And anything where the cost of getting it wrong exceeds the cost of the professional by a wide margin, which describes most of the above.

Where doing it yourself is reasonable

The genuinely accessible work.

Decorating, filling, sealing and tiling small areas.

Replacing like-for-like fittings — taps, toilet mechanisms, shower heads, door furniture, light fittings within local rules.

Adjusting and repairing doors, windows and furniture.

Clearing blockages and traps.

Draught-proofing and insulating accessible areas.

Assembling and fixing furniture.

Basic garden and external maintenance at ground level.

Most of this is described in more detail elsewhere on this site.

Finding someone competent

Which is the harder problem.

Check registration where a trade is regulated, on the official register rather than a badge on a van.

Obtain several quotes, in writing, itemised, describing the same scope so they are comparable.

Ask for recent work you can see and references you can contact.

Check insurance, specifically public liability and, where relevant, professional indemnity.

Establish who obtains any approvals and certificates, and that you will receive them.

And be cautious of unsolicited approaches, pressure to decide immediately, large payments up front, and cash-only arrangements without paperwork, which correlate with the worst outcomes.

Managing the work

Practical points.

Agree the scope, price, timescale and payment schedule in writing before starting.

Stage payments against completed milestones rather than paying a large sum in advance.

Retain a final portion until the work is complete and any snags addressed.

Photograph work in progress, particularly anything that will be covered up.

Raise problems immediately and in writing rather than at the end.

And keep all certificates and paperwork with the house records, which matters at sale and for warranties.

The honest calculation

Doing it yourself saves labour cost and spends time, and the time is frequently underestimated by a factor of two or three for anyone doing a job for the first time.

Which means the sensible question is not only whether you can do it, but whether the saving is worth the weekends, the tools purchased for one use, and the risk of a result you look at for a decade.

For some jobs the answer is clearly yes; for others it is a false economy that people only recognise afterwards.

General information only, not professional or legal advice. Regulations vary by jurisdiction — check local requirements and use registered professionals for gas, electrical and structural work.