Why Post-Construction Is Priced Per Square Foot
Floor area is the best available proxy for construction dust, but it breaks in four predictable places. How to read a per-foot bid properly.
House cleaning is usually quoted per visit, or by bedrooms and bathrooms. Post-construction is quoted per square foot almost universally. That is not an industry habit — it is the unit that tracks the work.
It is also a unit with known failure modes, and knowing them is how you read a bid.
Why floor area and not rooms
Bedroom count predicts a house clean well because a house clean is mostly about the things people use: beds, bathrooms, kitchens, floors that get walked on.
Post-construction is not about use. It is about dust distribution, and dust distributes over area.
Drywall sanding puts gypsum into the air of the entire building. It settles on every horizontal surface in proportion to how much horizontal surface there is. A 3,000 sq ft house with three bedrooms and a 3,000 sq ft house with five bedrooms have almost the same amount of dust in them, and almost the same amount of ceiling, trim, sill, floor and cabinet run to remove it from.
Bedroom count moves the number by very little. Floor area moves it a lot. So floor area is the unit.
How the number is built
Post-construction pricing is a base fee plus a rate per square foot. Ours is $175 plus $0.22 a foot, one-time only, with a $365 floor.
| Space | Roughly |
|---|---|
| 1,000 sq ft | $365–$440 |
| 1,800 sq ft | $525–$640 |
| 2,500 sq ft | about $725 |
| 4,000 sq ft | $970–$1,180 |
The base fee is the part that catches people out. It covers the things that cost the same regardless of size: getting a crew and equipment to site, HEPA vacuums, water, consumables, the first setup hour, and the walk at the end.
Which means the effective cost per foot falls as jobs get bigger. A 1,000 sq ft condo lands near $0.40 a foot all-in; a 4,000 sq ft custom home lands near $0.26. If somebody quotes you the same per-foot rate on both, one of those two numbers is wrong.
Where the model breaks
Four things are genuinely not proportional to floor area, and they are where bids diverge.
Glass. The largest single variable in the category. A Westlake or Lakeway build with a two-storey glass wall has the same floor area as a build with ordinary windows and several times the glass work — labels, adhesive, mortar splash, overspray, tracks. Exterior glass above ground floor changes it again because it changes the equipment.
Ceiling height. Twelve- and sixteen-foot ceilings mean ladders or lifts. The floor area is identical. The time is not.
Fixture and cabinet density. Kitchens and bathrooms are the slowest rooms per square foot in any building. A house with three full baths and a butler’s pantry takes longer than an equal-sized house with two baths and open plan.
Which phase you are buying. Rough, final and touch-up are three different jobs with three different rates. A per-foot number without a phase attached is not comparable to anything.
What should not be inside the per-foot rate
Two line items that belong outside it, and it is worth insisting they are shown separately.
Debris removal and disposal. Construction debris is not household trash. It does not go in the residential bin, and dumpster rental, hauling and landfill fees are real costs with their own pricing. A bid that quietly folds haul-off into a cleaning rate is either padding the rate or is going to leave the debris where it is.
Anything that needs another trade. Duct cleaning, floor refinishing, paint touch-up. If they appear in a cleaning bid, ask who is actually doing them.
Why it costs more than a house clean of the same size
A 2,600 sq ft house is $685–$835 post-construction and $310–$380 as a one-time deep clean. The gap is three specific jobs that a house clean does not contain:
- Grout haze removal on all new tile
- Sticker, label and adhesive residue on every pane, appliance and fixture
- Multiple passes, because fine dust is still airborne while the crew is working and lands after they leave
That third one is the reason post-construction is measured in crew-days rather than hours. You cannot compress a settling curve by working faster.
The four questions that make bids comparable
Ask every bidder for these and put the answers side by side:
- Which phase — rough, final, or touch-up?
- What square footage did you price, and from what source?
- Are windows included, interior only or both, and to what height?
- Is debris haul-off in or out of this number?
Two bids with those four fields filled in can be compared. Two bids with only a per-foot number cannot, and the cheaper one is usually cheaper because it is a smaller job.
Getting a number for your project
We price post-construction from the plan set if you have one and a walkthrough if you do not, and there is no travel charge to any of the fourteen cities we cover, so a Manor or Kyle subdivision prices the same as central Austin.
If you want a fast sanity check on any bid you already have, take the total, divide by the square footage, and see whether it sits near $0.40 on a small job and near $0.25 on a large one. Bids far below that on a final clean are usually a rough clean with a different label.
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