Contingency vs. Markup: What's the Difference, and Why You Need Both

Two percentages sit on almost every renovation estimate, and they get confused constantly — sometimes into a single number, sometimes dropped entirely. They're not interchangeable, and treating them as the same thing is one of the more common ways contractors end up working a job for less than they meant to.

What contingency actually covers

Contingency is a buffer for the unknowns every renovation runs into — the wall that turns out to hide knob-and-tube wiring, the subfloor that's rotten under three layers of old flooring, the fixture that's back-ordered and gets swapped for a pricier equivalent. It's a cost, not profit. You're not trying to make money on it; you're trying to not lose money when reality doesn't match the walkthrough.

A typical range is 10–15% of project cost, higher on older buildings or gut renovations where surprises are more likely, lower on cosmetic work like painting where the scope is easy to see in full before you start.

Bathroom work is a good example of why this matters: pull up old tile and you might find subfloor damage that never showed up during the walkthrough. It's part of why contractors who specialize in wet areas, like Elm Kitchen Bath & Outdoors, build certified waterproofing into the process up front rather than treating it as a surprise if it's found later — but even careful prep work doesn't eliminate the need for a contingency line, it just narrows how big it needs to be.

What markup actually covers

Markup is your margin — what you add on top of cost to run a business and make a living from it. It covers overhead you don't bill line by line (insurance, vehicle, tools, admin time) and the profit that's the actual point of taking the job. Where contingency is sized to the risk of a specific project, markup is usually closer to a consistent number you apply across your business, adjusted only when a job is unusually competitive or unusually easy.

What happens when you mix them up

Three mistakes show up over and over:

• Using one number for both. A single "buffer" percentage that's meant to cover surprises and pay you leaves no way to tell, after the job, whether you priced the risk correctly or just got lucky.
• Treating contingency as guaranteed profit. If the job goes smoothly and you don't spend the contingency, that's a bonus — not something to plan your margin around. Estimate as if you'll need it.
• Applying markup to contingency. Whether markup should apply on top of the contingency amount is a real decision, not an accident — know which way your numbers are set up, because it changes the total more than it looks like it would.

How to set each one

Start from your own job history, not a rule of thumb from the internet. If you track actual vs. estimated cost on past jobs, the gap tells you what contingency you actually needed — not what you guessed. For markup, work backward from what you need to earn in a year and how many jobs you can realistically run, rather than picking a number because it's what everyone else seems to charge.

Set them per job, not once for your whole business. A straightforward repaint and a gut renovation with an unknown structural condition don't carry the same risk, and the estimate should say so.

Try it with your own numbers: the free contractor markup calculator takes the job's costs and a markup (or a target margin) and shows the price, the gross profit, and the margin it really is — with contingency kept separate.

What markup do contractors charge?

There is no single number, and anyone quoting one without a job type attached is guessing. What published trade guides and contractor surveys tend to agree on: residential remodelers commonly carry a markup on cost somewhere in the 15 to 35 percent range to cover overhead and profit; general contractors on larger, longer jobs run lower because the dollars are bigger; specialty trades and small, short jobs run higher because the overhead of showing up is the same whatever the ticket. A markup under 10 percent on residential work is usually a contractor who has not counted their overhead yet. Your own number comes from the arithmetic in the section above — what you need to earn in a year, divided across the jobs you can actually do — not from the range.

Contractor markup percentage versus margin

The number most often mis-stated is not the markup but what it is a percentage of. Markup is on cost; margin is on price; the same job reads very differently in each:

A "25 percent markup" is a 20 percent margin. A "30 percent margin" needs a 43 percent markup. When a client, a supplier or a forum quotes a figure, ask which one. The free contractor markup calculator converts either way and shows what a given markup leaves after contingency and tax.

Where this lives in an Estiquik estimate

Contingency % and Markup % are separate fields on every estimate, and both compound into the final total along with tax — so you can see, before you send anything, exactly what each one is adding to the price. Set either to 0% if a job genuinely doesn't need it.