An AI takeoff for a single-family house works in layers. You upload the PDF plan set, the AI reads the sheets, and you use one-click tools for the quantities that drive most of the estimate: wall linear footage, room square footage, and door and window counts. From those you derive drywall, framing, insulation and trim. Roofing, concrete and site work come from the roof, foundation and grading sheets. You review every AI result on the sheet before it goes into the estimate.
Below is the full walkthrough, an example quantity table for a 2,400 SF house, and the checks you should still do by hand.
What a single-family plan set usually contains
Before any software touches it, know what you're working with. A typical house set includes:
- Cover and general notes: code edition, design loads, general requirements
- Site plan and grading plan: footprint, setbacks, driveway, utilities, finished floor elevation, contours
- Foundation plan: footings, stem walls or slab, thickened edges, hold-downs
- Floor plans: walls, rooms, doors, windows, dimensions
- Roof plan: ridges, valleys, hips, pitch, overhangs
- Elevations and sections: wall heights, plate heights, window head heights, siding and trim
- Structural framing plans and details: headers, beams, joists or trusses, shear walls
- Schedules: doors, windows, finishes
- MEP sheets (sometimes): electrical, plumbing, mechanical
Missing sheets are the first thing to catch. If there is no structural sheet, headers and beams are guesses until you get one.
Step 1: Upload the set and let the AI read it
In Foreman AI, you upload the whole PDF plan set. The AI reads every sheet and spec, so before you measure anything you can ask:
- "What are the plate heights on the main floor?"
- "What's the slab thickness and is there a vapor barrier?"
- "What roof pitch is called out on the roof plan?"
- "List the window schedule with quantities."
Answers cite the sheet, so you can click through and check. This replaces the half hour of flipping pages that usually starts a takeoff. If you are new to reading plan sets, our guide to how AI reads construction blueprints explains the idea.
Step 2: Verify the scale on every sheet you'll measure
Every takeoff method, AI or manual, depends on scale. In Takeoff Studio, sheets are calibrated, but you should still measure one written dimension per sheet and confirm it matches. A plan printed at half size and re-scanned is the most common reason an otherwise good takeoff is wrong by 2x on lengths and 4x on areas.
Step 3: Walls (linear footage, exterior vs interior)
Click a wall and the AI traces the connected wall network, returning total linear footage split into exterior and interior. An AI clean-up pass fixes trace mistakes, and you review the trace on the sheet and accept it. Every segment is editable geometry, so if a cabinet line got picked up or a short wall got missed, you fix it and the LF updates.
Wall LF drives framing, sheathing, house wrap, siding, drywall, insulation and paint, so this is the most important number to get right. The full method, including what to do with openings and wall heights, is in our wall linear footage guide and the wall tracer write-up.
Step 4: Rooms (net floor area)
One click finds the rooms and squares each one to the inside face of the walls. That gives you net room SF for flooring, paint and ceiling drywall, which is always smaller than the gross house SF on the cover sheet. On the example house below, the difference is about 200 SF, which is real money on flooring. More on that in one-click room square footage.
Step 5: Doors and windows
Doors and windows detection finds openings on the floor plans and counts them, with an AI clean-up pass you review and accept. Then reconcile the count against the door and window schedules. If the plan shows a window the schedule doesn't carry, that's an RFI. Our guide to counting doors and windows from plans covers schedules, rough openings and header lengths.
Step 6: Drywall
Drywall comes from the wall LF and room SF you already have:
- Exterior walls, inside face: exterior LF x wall height
- Interior walls, both sides: interior LF x wall height x 2
- Ceilings: net room SF (add for vaulted ceilings using the section)
Add waste, divide by sheet size. Carry garage walls and ceiling separately, since the separation wall and ceiling usually have their own rated assembly. See the drywall takeoff page.
Step 7: Framing
From wall LF:
- Studs: a common estimating rule is 1 stud per LF of wall, which covers 16 in on-center spacing plus corners, openings and blocking
- Plates: 3 x wall LF (one bottom plate, two top plates), by stud size
- Headers: from the opening count and the structural sheets
- Sheathing: exterior LF x wall height + gable ends, divided by 32 SF per sheet with waste
Roof and floor framing (trusses or rafters, joists) come from the framing plans. See the framing takeoff page.
Step 8: Roofing
Measure the roof plan area including overhangs with the area tool, then multiply by the pitch factor to get sloped area. Ask the AI for the pitch if it isn't obvious; it's usually on the roof plan or elevations. Common pitch factors: 4/12 = 1.054, 6/12 = 1.118, 8/12 = 1.202, 10/12 = 1.302. Divide by 100 SF per square and add waste (more for hips and valleys). Measure eaves, rakes, ridges, hips and valleys as linear items for drip edge, ridge cap and flashing. See the roofing takeoff page.
Step 9: Concrete
From the foundation plan:
- Slab: area x thickness / 27
- Footings: LF x width x depth / 27
- Stem walls, piers, thickened edges: LF or count x section
Add waste: a few percent on slabs, more on footings dug into native soil. See the concrete takeoff page.
Step 10: Site work
From the site and grading plans:
- Earthwork: trace existing and proposed contours and spot grades on the PDF grading plan, or ask the AI to work the grading plan, and get cut CY, fill CY and net import/export with a heat map and PDF report (earthwork takeoff). Volumes are bank yards; apply swell for trucking and shrink for compacted fill.
- Stripping: disturbed area x topsoil depth
- Basement or pit digs: area x depth with the flat-bottom dig tools
- Linear items: silt fence, curb, utility trench
- Paving: driveway and walk areas
Example quantity table: a 2,400 SF single-story house
Example: a one-story house with a 60 ft x 40 ft footprint (2,400 SF gross), an attached 24 ft x 24 ft garage (576 SF), 9 ft walls, 2x6 exterior walls, 2x4 interior walls, slab on grade, 6/12 roof. This is an invented example to show the math. Real quantities come from your plans.
| Category | Item | Source / math | Example quantity |
|---|---|---|---|
| Walls | Exterior wall, house | 2 x (60 + 40) | 200 LF |
| Walls | Exterior wall, garage (3 sides) | 24 + 24 + 24 | 72 LF |
| Walls | Interior partitions | AI wall trace, reviewed | 260 LF |
| Rooms | Net room area | (60 - 1.08) x (40 - 1.08) = 2,293 SF, minus 260 LF x 0.375 ft interior walls = 97.5 SF | 2,196 SF |
| Openings | Windows | Detected, matched to schedule | 16 |
| Openings | Exterior doors (front, patio slider, garage service) | Detected, matched to schedule | 3 |
| Openings | House-to-garage door | Schedule | 1 |
| Openings | Interior doors | Detected, matched to schedule | 14 |
| Openings | Garage overhead door, 16 x 7 | Schedule | 1 |
| Drywall | Exterior walls, inside face | 200 x 9 | 1,800 SF |
| Drywall | Interior walls, both sides | 260 x 9 x 2 | 4,680 SF |
| Drywall | Ceilings | Net room area | 2,196 SF |
| Drywall | Total house, +10% waste | 8,676 x 1.10 = 9,544 SF / 48 SF | 199 sheets 4x12 |
| Framing | Exterior studs, 2x6 (house + garage) | 1 per LF: 200 + 72 | 272 studs |
| Framing | Interior studs, 2x4 | 1 per LF | 260 studs |
| Framing | Exterior plates, 2x6 | 3 x 272 | 816 LF |
| Framing | Interior plates, 2x4 | 3 x 260 | 780 LF |
| Framing | Wall sheathing, +10% | (272 x 9 = 2,448 SF) x 1.10 = 2,693 SF / 32 | 85 sheets 4x8 (plus gables) |
| Roofing | Roof plan area with overhangs | Measured on roof plan | 3,400 SF |
| Roofing | Sloped area at 6/12 | 3,400 x 1.118 | 3,801 SF |
| Roofing | Shingles, +10% | 38.0 squares x 1.10 = 41.8 | 42 squares |
| Concrete | House slab, 4 in | 2,400 x 0.333 / 27 | 29.6 CY |
| Concrete | Garage slab, 4 in | 576 x 0.333 / 27 | 7.1 CY |
| Concrete | Footings, 16 in x 10 in | 272 LF x 1.11 SF / 27 | 11.2 CY |
| Concrete | Order with waste (5% slab, 10% footing) | 36.7 x 1.05 + 11.2 x 1.10 = 38.6 + 12.3 | 51 CY |
| Site | Gravel base under slabs, 4 in | 2,976 x 0.333 / 27 | 36.7 CY |
| Site | Topsoil strip, 6 in over 6,000 SF disturbed area | 6,000 x 0.5 / 27 | 111 CY |
| Site | Driveway | 20 x 40 | 800 SF |
| Site | Silt fence | Along erosion control line on site plan | 260 LF |
| Site | Cut / fill | From grading plan contours | Per plan |
A few things worth noticing in the example:
- Net room area (2,196 SF) is about 8.5% less than gross (2,400 SF). Flooring and ceiling drywall should use net area plus waste, not the number on the cover sheet.
- Interior wall LF (260) is larger than the exterior perimeter (200). That's normal on a house. If your interior number is small, you probably missed closets.
- Drywall doesn't deduct openings here. Many estimators don't deduct standard windows and doors because the cut-out waste offsets them. Large openings like a patio slider or a garage door opening are a different story. Pick a rule and stick to it.
- The concrete order rounds up. 50.9 CY becomes 51 CY, split across pours as the schedule requires.
What to verify by hand
AI speeds up the first pass. It doesn't replace your review. Before you send the estimate, check:
- Scale on every sheet you measured, against a written dimension.
- Wall trace in dense areas: kitchens, bathrooms, closets and stairs, where cabinets, fixtures and dimension strings sit near walls.
- Exterior vs interior split at the garage and any porches, where enclosure is ambiguous.
- Wall heights by area: vaulted rooms, split plate heights and garages with taller walls change drywall and studs.
- Door and window counts against the schedules, with RFIs for mismatches.
- Headers and beams from the structural sheets, not from rules of thumb.
- Roof pitch and overhangs from the roof plan and elevations.
- Slab thickness and footing sizes from the foundation plan and details, including thickened edges and interior bearing footings.
- Earthwork units: bank yards from the surface math, loose yards for trucks, compacted yards for fill.
- Scope that isn't drawn: permits, temporary utilities, dumpsters, cleanup, landscaping allowances.
Our construction takeoff checklist has a longer version.
From quantities to a priced estimate
Once the quantities are reviewed, they flow into Foreman AI's budget builder, which prices lines from your cost catalog, your company history, AI market estimates or web pricing. From the budget you can build a proposal, schedule of values or sub bid packages. If you run jobs in JobTread, the integration can create or update cost items on the job after you confirm (JobTread estimate guide).
Try it on your next house plan
Take a house plan you've already estimated by hand, run it through the AI takeoff, and compare wall LF, room SF and opening counts to your numbers. Upload a plan set and try it free, with AI credits included and no card required. Starter and Pro plans are on the pricing page.
FAQ
Can AI do a takeoff for a house?
Yes, for the measurable parts. AI tools can trace walls, find rooms, and detect doors and windows on a house plan, then you review and correct the results on the sheet. Structural members, specialty items and anything not drawn still need your judgment.
How long does a takeoff for a single-family house take?
By hand, a full takeoff on a typical house plan often takes several hours, depending on the size of the set and how many trades you cover. With AI doing the first pass on walls, rooms and openings, most of the time shifts to reviewing results and checking the items listed above.
What is the difference between gross and net square footage on a house plan?
Gross square footage is usually measured to the outside of the exterior walls and is the number on the cover sheet. Net square footage is the area inside the rooms, measured to the inside face of walls, with wall thickness removed. Use net area for flooring and ceilings.
How many sheets of drywall does a 2,400 square foot house need?
It depends on wall height, interior wall length and ceiling design, so calculate it from the plan. In our example house with 9 ft walls, 200 LF of exterior wall and 260 LF of interior wall, the house needs about 199 sheets of 4x12 drywall including 10% waste, with the garage carried separately.