Estimating guide · Siding
How to estimate a siding job
Siding is wall geometry plus accessories: net area drives squares, but corners, trim, and wrap are where estimates go soft. Measure edges like they cost money — they do.
A repeatable process
Measure walls and subtract openings
Gross wall area minus doors and windows. Measure gables as triangles: half base times height.
Set waste from complexity
Long rectangular walls waste less; cut-up elevations with gables and dormers waste more. Ten percent is a starting point.
Take off accessories in lineal feet
Inside/outside corners, J-channel, starter, and trim are lineal-foot counts from measured edges.
Include wrap and flashing
Housewrap, flashing tape, and pan flashing are material lines, not incidentals.
Price labor by exposure and height
Single-story flat walls install faster than tall, cut-up elevations. Scaffold and access are labor factors.
Where siding estimates go wrong
Accessories priced from area
Trim scales with edges and openings, not wall squares.
Gables forgotten
Triangular gable areas are routinely dropped from takeoffs.
Wrap treated as free
Housewrap on a whole house is hundreds of dollars of material plus labor.
Certified benchmark · 2026-08-21
In 520 certified profile-mode generations across 26 supported Instant assemblies on Windows (profile/AOT) and an Android API 36 emulator, supported jobs became editable estimates in a median of 0.028 seconds (rounded); the measured 95th percentile was 48.008 milliseconds (approximately 0.048 seconds), with 0 generative-AI provider calls.
- median, supported jobs
- 0.028 sec
- certified generations
- 520
- supported assemblies
- 26
- failures · 0 AI provider calls
- 0
Certified supported jobs only. Editable output; contractor pricing and field verification remain in control. Full methodology and results
See it run on your own jobs
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