DIY vs Contractor Savings Calculator

The single most useful number for deciding whether to DIY is what share of a contractor's price is labour rather than materials. You pay the materials either way. Only the labour is available to be saved.

Painting is roughly 80% labour, which is why it's the best-value DIY job in the house — a $3,000 painting quote covers maybe $600 of paint and supplies. Demolition is 85%, which is why sweat equity on strip-out is genuinely worth it. Countertop fabrication is about 30%, and there's no DIY path anyway.

The corollary is uncomfortable but useful: on low labour-share jobs, doing it yourself saves less than the risk you're taking on. That's the calculation most enthusiasm skips.

The calculator adds an expected cost of getting it wrong, weighted by the job's difficulty and your own honest assessment of your skill. It is not a prediction that you'll fail. It's the same arithmetic an insurer does: a probability multiplied by a consequence.

For a beginner tiling a shower — difficulty 5 — that allowance is substantial, and it should be. Waterproofing failures behind tile are expensive and slow to reveal themselves. For a handy person painting a bedroom, it's almost nothing, because the worst case is another coat.

If you think the allowance is too high for you, say you're experienced and watch it fall. The point isn't to talk you out of anything; it's to put a number on the thing that usually goes unpriced.

The tool asks what an hour of your time is worth, and the honest answer isn't your salary. It's what you'd genuinely pay to get a Saturday back — which for most people is considerably less than they earn, and for some is considerably more.

Once you set it, the effective hourly rate becomes the interesting number. A job saving $2,400 across 30 hours pays $80 an hour, which is a good return by most standards. The same $2,400 across 200 hours pays $12, which is a hobby rather than a saving.

This is also the calculation that argues for splitting a project. Doing the demolition and the painting yourself while a contractor does the tile and the plumbing frequently captures most of the available saving for a fraction of the time and risk. That option almost never appears in DIY-versus-pro content, and it's usually the right answer.

Two categories return that verdict no matter what the numbers say. New electrical circuits and panel work, because the failure mode is fire and the work is licensed and inspected almost everywhere. And moving plumbing, because concealed leaks are expensive, slow to appear, and are frequently discovered by the buyer's inspector rather than by you.

Countertop fabrication is a third, for a different reason: there simply isn't a DIY path. Stone is templated from installed cabinets, cut on machinery you don't have, and installed by people who do this daily. Nothing about that is a homeowner task.

Everything else on the list is a genuine judgement call, which is what the calculator is for.

The framing of this decision is nearly always binary — do it yourself or hire a contractor — and that framing is what costs people money, because most projects divide cleanly into parts with very different labour shares and very different risk profiles.

Demolition is the clearest example. It is roughly 85 percent labour, requires no licence, and its failure modes are visible immediately rather than concealed in a wall. A homeowner who strips a bathroom to the studs over a weekend removes a meaningful line from the contractor's quote and hands over a space the trades can start on directly. The same logic applies to painting at the other end of the project, and to hauling, site cleanup, and buying and staging materials.

The technical middle — rough plumbing, electrical, tile setting, waterproofing — is where the labour share falls and the consequences of getting it wrong rise. That is the part worth paying for, and it is also the part where a contractor's own quote is most competitive, because it is the work they are efficient at.

There is one thing to negotiate explicitly if you go this route: warranty boundaries. A contractor who tiles a shower will warrant that shower; a contractor who tiles over waterproofing you installed generally will not warrant either. Agree in writing who is responsible for what, and put the boundary somewhere physically obvious — a contractor taking over at the studs is a clean line, while one taking over halfway through a wall assembly is not.

The scheduling cost is real too. Your weekend demolition has to finish before their Monday, and a contractor whose crew arrives to an unfinished site will charge for the day. Agree the handover date and treat it as a hard one.

Every estimate on this page is materials, labour, tools and a rework allowance. There are four real costs it does not attempt, because they vary too much to model honestly — and all four move the decision.

Permit and inspection fees vary by jurisdiction from trivial to several hundred dollars per trade, and the wait for an inspector is frequently the longest single delay in a project. A DIY route does not avoid either: permits attach to the work, not to who performs it.

Disposal is routinely underestimated. Demolition generates far more volume than expected, dumpster rental is priced by size and duration, and many landfills charge separately for tile, drywall and treated lumber. A contractor's quote usually includes it; a DIY plan usually does not until the driveway is full.

Delay has a price when it displaces you. A bathroom that is out of service for three extra weekends because the work happens on Saturdays is a real cost in a one-bathroom house, even though no money changes hands.

And the value of finishing is genuinely hard to price. The most expensive DIY outcome is not a mistake — it is a project that stalls at 80 percent and stays there, which then costs more to have someone finish than it would have cost to hire out from the start, because taking over half-finished work carries a premium. That risk is highest on long projects with many stages, which is exactly where the paper saving looks largest.