Hire a contractor or do it yourself? Where a pro can cost less
Updated October 25, 2026
In short
DIY looks cheaper until you price materials at retail, add tool rentals and redo mistakes. Licensed contractors buy at wholesale through trade supply houses, know what passes inspection, and include the permit, which you cannot file yourself for electrical, plumbing or gas work in NYC.
Materials at wholesale prices
Licensed contractors hold trade accounts with electrical, plumbing and building supply houses. Prices on wire, breakers, pipe, fixtures, tile and lumber are often well below big-box retail, and contractors can get items stores do not stock.
Costs DIY estimates leave out
- Tool and equipment rental
- Extra material from mistakes and returns
- Rework after a failed inspection
- Water or fire damage from an improper repair
- Your own time, often several weekends
Work you cannot legally do yourself
In NYC, electrical work must be done by a licensed electrician, and plumbing and gas work by a licensed plumber. Unpermitted work can cause violations, insurance problems and delays when you sell or refinance.
Where DIY makes sense
Painting, simple fixture swaps that are not electrical, and cleanup are reasonable DIY jobs. A common way to save is to do the prep and painting yourself and hire out the licensed trades.
Questions
Do contractors pass on wholesale prices?
Pricing models differ. Ask whether materials are itemized in the estimate so you can compare them with retail prices yourself.
Can I buy my own materials?
Yes. Owner-supplied fixtures and appliances are common; the estimate then covers labor only.
General information, not legal or engineering advice. Rules change and every building is different. Check with the Department of Buildings, your town or your building management.