You replace the drawing with a capture standard: the same measurements, the same photographs and the same condition checks, in the same order, on every job, whether or not you think you will need them. Do that and you price from the truck instead of driving back across town. Start with the year the house was built, because that changes the method and not just the number — the median owner-occupied home in the US is 42 years old and 47% were built before 1980, according to NAHB's read of the American Community Survey. Then the shell. Then a photograph of every connection you have to touch. Then a written list of what you could not see.
What do you measure when there are no drawings?
The shell, the openings, the fixtures and the route in. In that order, because the order is what stops you leaving with a gap.
The shell. Wall lengths, and then both diagonals. A 1950s bedroom that reads 12 feet by 10 will often come back with three or four inches of difference corner to corner, and that difference is the whole argument about cabinet fillers and tile layout before it happens. Take ceiling height at two opposite corners, not one. Houses settle.
Measure to framing wherever the finish is coming off. You are pricing the wall that will exist, not the one in front of you. Strip plaster and lath off a 1920s room and it grows close to an inch on each side, which nobody notices until the vanity that fit on paper fits with room to spare and the backsplash order is short.
The openings. Rough opening, not glass size, not the trim. Door swings too. Write down which way every door in the work area opens, because a new vanity that blocks a bathroom door is a problem you would rather not meet on install day.
The route in. Where the truck parks, how far to the door, how many stairs, gate width, whether the dumpster can sit on the drive. None of it is in the room you were asked to look at, and all of it is labor.
What has to be in the photographs before you leave?
Everything you will have to connect to, plus one wide shot per wall. This is where people fail. They shoot the pretty room and not the ugly closet where the decisions live.
- The panel, door open, directory legible. Read the main breaker and count the open spaces. Then step back and shoot what is stacked in front of it.
- Under every sink. Supply valves and trap, plus whether the stops turn at all.
- The water heater data plate, the main shutoff and the meter.
- The attic hatch and what is on the other side of it. Point the phone up through it if you are not going in.
- The joists from below for any floor getting tile: size and spacing, plus the clear span.
- Where the range hood and the bath fan terminate outside. If you cannot find the termination from the yard, it does not exist.
- One shot per wall with the tape extended in frame. This is the one that saves the second trip. Any dimension you forgot to write down is still readable in the photo.
Which conditions change the price after you have already quoted?
Four, and they are all visible in under ten minutes if you know to look. None of them cost you anything.
Year built. Paid work that disturbs paint in housing built before 1978 falls under EPA's Renovation, Repair and Painting rule: certified firm, certified renovator on site, containment, post-work cleaning, records. That is a different method with different hours, not a line you add later. EPA's own enforcement alert describes a $400,000 penalty against one renovation firm and a $20.75 million settlement with Home Depot over contractors who did not follow it. Ask the year, then verify it against the county record rather than the homeowner's memory.
Floor structure under tile. The Tile Council of North America puts the accepted minimum floor rigidity at L/360 before the underlayment goes in — span divided by 360. A 2x8 at 16 inches on center over a 13-foot clear span does not get there, and the fix is sistering or a new beam, not a thicker mortar bed. Five minutes in the crawl space with a flashlight tells you which conversation you are having.
Ventilation. ASHRAE 62.2 wants 50 CFM intermittent or 20 CFM continuous in a bathroom and a 100 CFM vented range hood in a kitchen, as Fantech summarises it. Half the older baths you walk have a fan ducted into the attic and nothing else. New duct, new roof or wall cap, and a roofer if it is a shingle penetration.
Service capacity. Open spaces in the panel are not the same as available amps. Photograph the directory. Read the main.
What should you capture in each room?
| Room | Measure | Photograph | The check people skip |
|---|---|---|---|
| Bathroom | Walls plus both diagonals, ceiling height, window RO, existing shower footprint | Under-vanity valves, panel, fan grille and its attic-side duct | Whether the toilet flange ends up below the new finish floor |
| Kitchen | Wall runs to framing, soffit height, appliance openings, window centerline | Panel and directory, sink valves, hood termination outside | Where the range hood duct actually goes |
| Flooring | Square footage by room, doorway widths, transitions, existing floor build-up | Subfloor at a floor-vent cut, joists from below | Whether the doors still clear at the new height |
| Deck or exterior | Grade at each post location, band joist height, distance to the nearest hose bibb and exterior outlet | Ledger flashing, band joist from inside, the path from the street | Gate width, and whether material can reach the back |
| Whole-house repaint | Height at the tallest elevation, linear feet of trim | Substrate close-ups, paint condition on the weather side | Year built, before anything else |
What do you do about what you cannot see?
Name it, price it, and say the number out loud while you are standing in the room. Out loud matters.
This is the position, and it is worth defending: a named allowance closes better than a lower number that turns into a surprise in week two. "There is $900 in here for whatever is behind that wall. If it opens up clean, you keep it." The homeowner hears a contractor who has done this before. The alternative — quoting tight and hoping — is how a good job turns into an argument, and it is the same failure mode behind most underestimating. Allowances belong on the estimate as their own lines, in plain words, alongside everything else the document has to carry.
When should you build the checklist?
Now. In the quiet part of the year. Interest in "contractor estimate" on Google Trends runs at its lowest through late August and September and climbs steadily from January to a peak in early June. Those are relative index numbers, not volumes, so read the shape rather than the values. The shape says you have a few weeks before the calls start, and a capture standard written in March is a capture standard written badly.
What this misses
A walkthrough estimate is not a bid set. Structural work, anything permitted, and additions all need drawings, and no checklist replaces an engineer's stamp. What the walkthrough decides is how much of the job you are willing to price firm.
You will be slower for a month. The first ten times you run a fixed list it feels like bureaucracy in front of a customer who is waiting. Tell them what you are doing — "I measure the same way every time so the price does not move" — and it reads as competence instead.
Deflection numbers for natural stone are stricter than L/360 and vary by product. Check the setting-material manufacturer's data sheet for the specific stone rather than assuming ceramic limits cover you.
ASHRAE 62.2 is a standard, not a code, until your jurisdiction adopts it, and adoption varies by state. Local amendments beat anything written here.
The hard part of all this was never the list. It is that the list has to happen in someone's bathroom, out loud, with the homeowner watching and a tape in one hand. BidWalk records the lines as you walk and talk, so the capture and the estimate are the same pass instead of two.
