How to Estimate Exterior Painting: Walk the House Once, Side by Side

Exterior estimates go wrong for one reason: painters try to eyeball the whole house at once. A house is too big to eyeball. The fix is to break it into four sides — front, right, back, left — and estimate each side like it's its own little job. Walk the house once, capture everything side by side, and nothing gets missed.

Here's my method after 15 years of exterior bids.

Step 1 — Walk the house in one direction

Start at the front, work clockwise: front → right → back → left. On each side, capture two kinds of numbers:

Body (siding) area. Here's where exterior differs from interior: I'm deliberately less precise out here. A house is hard to measure exactly — gables, grade changes, ladders — and the juice isn't worth the squeeze. So the way I teach it: round everything to the nearest 5 feet (8 becomes 10, 6 becomes 5), and for surface area, every story counts as 10 feet tall. Measure the length of the wall at each story, multiply by 10 per story, and you've got a body square-footage that's plenty accurate for pricing. (Interior is the opposite — laser measures make exact easy, so inside I use actual feet.)

Counts, per side. Windows, doors (and sidelights — count them as half a door), garage doors, shutters. Per side matters — you'll see why in a minute.

Step 2 — The linear-foot items: soffits, fascia, trim

The stuff along the roofline is measured in linear feet, and it hides two pricing traps:

• Fascia and soffits are a package deal. If you're painting both, the soffit goes faster (you're already up there with the fascia color); if soffits get done alone, they're slower. Your pricing should know which situation it's in.
• Soffits that match the body color can often be sprayed with the body — much faster than cutting them in separately. Same wood, three different speeds depending on what's around it.

Same idea with doors and windows: if the trim gets the body color and you're spraying the siding anyway, those openings are mostly masking work. If they're a separate color, each one is its own brush-out. That's why you counted them per side — a door on a side where you're spraying body color prices differently than one standing alone.

Step 3 — Note the prep and the wood

Exterior is where prep and repairs sink careless bids:

• Prep hours — scraping, sanding, caulking, priming bare spots. Walk close, look at the south and west faces (sun beats them up worst), and put honest hours on it as its own line.
• Rotten wood — fascia boards, trim, siding sections. Decide up front whether you replace wood (price it per board/linear foot, labor + materials) or exclude it in writing. The worst answer is silence — that's how you end up eating a carpentry job you never priced.

Step 4 — Colors and coats

Same as interior, bigger stakes: same color = often one coat; color change = two. On a whole house that's thousands of square feet of difference. Also note how many colors (body, trim, accent door, shutters) — every extra color is extra setup, masking, and cut lines.

Step 5 — Turn it into a price

Now it's the same engine as every good estimate:

1. Quantities ÷ your production rates = hours, per item, per side (spray rates and brush rates are different animals — use the right one).
2. Hours × your loaded labor rate = labor.
3. Paintable area ÷ coverage × coats = gallons; add sundries.
4. Mark it up to your margin. Done.

If that engine is new to you, start here: Painting Production Rates.

The catch: exteriors have a lot of moving parts

Four sides × a dozen item types × color-matching rules × two application methods — an exterior estimate done right has real bookkeeping in it. Doing that on a clipboard is where things get dropped.

This is exactly what I built Paint Pals to handle: it thinks in four sides like you walk it, applies the right rate automatically (it even knows a soffit that matches the fascia paints faster than one that doesn't, and prices a door differently when it's on a side you're already spraying), handles wood replacement as its own line, and builds the price while you're still standing in the driveway.

Related: Free Painting Estimate Calculator · How to Estimate a Paint Job — the full 7.5-step process · Painting Production Rates · How to Estimate Interior Painting