The House Painting Estimate Explained

A painting estimate is not just a price. It’s a record of every decision a contractor makes about your home before work begins — what gets prepped, what gets primed, where each paint color goes, and how many coats will be applied. When you are committing to a significant investment in your home, the estimate is your clearest window into how a contractor thinks and works.

Why Do Estimates Vary So Much?

No two homes are the same job. A well-maintained one-story bungalow is a very different project than a three-story Victorian with wood siding that hasn’t been painted in 30 years. The estimate reflects that difference.

The main variables that move the number:

Square footage and stories. More surface area means more labor and materials. A second or third story means more difficult ladder moves. A dormer on a pitched roof adds a risk factor requiring the use of safety equipment.

Siding condition. Peeling paint, exposed wood, cracked caulk, or moisture damage all require prep work before a brush touches anything. Old, damaged siding with 100 years’ worth of paint jobs may need to be replaced. Skipping that prep and further deferring maintenance is how you end up repainting in four years.

Lead paint. Homes built before 1978 may contain lead-based paint. The older your home is, the more likely lead is present under the layers. By federal law, that work must be performed by an EPA-certified Lead Renovator. It’s not optional, and any estimate on an older home should address it directly.

Siding material. Cedar lap, shingles, stucco, and aluminum or vinyl siding all paint differently and require different prep and painting approaches.

Architectural complexity. Lots of trim, detailed eaves, shutters, or multiple colors take considerably more time than a simple one-story rancher.

Windows and doors. The more windows and doors on a home, the more time to mask them and paint the trim. Historic wood window sashes require extra prep and painting time. Re-staining doors well takes time and skill as does adding a fine finish to an entry door.

Carpentry repairs. Dry rot, curled or cracked siding, rotten sections of a concrete foundation, and other repairs must be addressed before painting begins. Deferred maintenance increases the price of an estimate.

Storm windows. Storm windows must be removed to paint behind them, cleaned, and then replaced at the end of the project. This takes time.

Drastic color changes. Going from dark-to-light siding and especially brushed trim may require a full coat of primer to block out the old color. Conversely, going from light-to-dark may mean the application of an additional coat for proper coverage. Painting saturated colors such as vibrant yellows or reds usually require three or more coats.

Proper priming. An estimate may specify that priming will be done, but the best way to ensure that the primer protects wood surfaces is to apply it with brushes and rollers. Brushing, together with rolling is the best application technique which takes significantly more time than just spraying it on. Rolling ensures full coverage and brushing works the primer into the cells of the wood and fills cracks. For larger surface areas, spaying primer is common, but it must be “back-brushed” or “back-rolled” – meaning it’s manually worked into the wood after being sprayed on. Spraying alone doesn’t work the primer into the wood well enough.

Wood decks. Re-staining decks are usually done at the same time as house painting. This adds to the costs.

Paint quality. In Portland’s wet climate, premium exterior paint is not a luxury. Good paint is still a fraction of the overall costs and it’s cheaper than doing the job over again in five years.

What’s Actually in a Good Estimate

A thorough estimate should walk through the scope of work clearly enough that you could hand it to a different contractor and get an apples-to-apples comparison. Look for:

Prep work spelled out. Scraping, sanding, caulking, priming — these should be listed, not implied. Prep is where corners get cut.

Paint brand and product. “Exterior paint” is not a spec. Benjamin Moore’s Regal Select and a hardware store house brand are not the same thing.

Number of coats. Two coats is standard. One coat is fast and cheap and will look like it in three years.

Warranty or guarantee. A contractor who stands behind their work will put it in writing. Vague verbal assurances are worth exactly that.

Get More Than One

Get at least two or three estimates before making a decision. Not because you should automatically pick the middle one — but because comparing them teaches you something. If one estimate is significantly lower than the others, it’s worth asking why. Usually, the answer is somewhere in the prep section, or more precisely, the absence of one.

The estimate process also gives you a chance to evaluate the contractor as a person. Do they walk the property carefully? Do they answer questions clearly, or do they deflect? Someone who’s vague before the job starts is unlikely to get more communicative once the project is underway.

Most reputable contractors offer free estimates with no obligation.

Frequently Asked Questions about Painting Costs

Are painting estimates actually free?

Yes. Any reputable contractor will walk your property, assess what it needs, and provide a written estimate at no charge. There’s no obligation attached to it, but if you don’t go with them, at least do the courtesy of letting them know.

How many estimates should I get?

Two to three is a reasonable number. It gives you a realistic sense of the market rate and lets you compare approaches, not just prices. Pay attention to how much detail each estimate includes — that tells you a lot.

Why do estimates vary so much between contractors?

It comes down to prep, craftsmanship, and experience bidding your type of home. First, a lower bid often means less surface preparation — less scraping, no caulking, poor priming, and fewer coats. That saves money upfront and costs you more later.

Second, a lower bid may mean cheap labor (i.e., inexperienced, unprofessional). Experienced craftspeople will deliver a better, longer-lasting product and know how to handle special circumstances.

Finally, if the contractor doesn’t have good estimating practices, they may guess at the price based on the home’s size. This is bad, bad, bad because if they underestimate the time it takes to do the job properly, corners may start getting cut once the project gets behind or they may pull most of the crew to start on their next scheduled project.

How long should exterior paint last in Portland?

With proper prep and quality paint, 10 to 15 years is realistic but some fading on a sunny south side may start after 5 years. Portland’s wet winters are hard on exterior finishes, so surface prep and paint quality matter more here than they would in a drier climate. Cutting corners on either shortens that window considerably.