Know what you can build on any lot, in minutes.

What can be built is written in long legal documents, and checking one property takes specialists weeks. A phone scan, the city's rules applied to it, and you see which home fits and exactly where: every number traced to the law and the measurement.

Cities have the land. Unlock what already fits.

See the walkthroughBook a demo

The lot is measured, not assumed.The law is computed, not summarized.

LotFit[Street address][Jurisdiction] code applied
Plan A§ side setback ≥ 5.0 ft✓ 6.4 ft ± 0.3§ lot coverage ≤ 40 %✓ Plan A 36.2 %§ height ≤ 30.0 ft✓ Plan A 24.0 ft§ front setback ≥ 20.0 ft✓ 24.2 ft ± 0.3
Plan A fits · 4 of 4 rules
North line · partialWalk the north fence, corner to corner
Coverage 2 of 4

01 How it works

From a phone walk to a proven answer.

Building codes set limits on every lot: how close to the lot line, how tall, how much ground a home can cover. BuildNexus measures the lot and shows exactly what fits inside them.

  1. 1 · Scan

    Walk the lot with a phone

    The app guides the walk in real time until it has captured every boundary, wall and corner the answer depends on.

  2. 2 · Measure

    An exact 3D model of the lot

    The walk becomes a precise 3D model of the property, and the report shows how accurate every measurement is.

  3. 3 · Apply the law

    City rules, ready to run

    Setbacks, height limits and coverage rules are taken from the legal text, each carrying its section, formula and official source.

  4. 4 · Answer

    See what fits, with proof

    Every home design is tested against the 3D lot. Each result links to its legal clause and its site measurement.

02 Products

One walk, two products.

Pre-approved catalogue4 plans · one lot
Plan AFits
Plan BFits, rotated
Plan CCheck
Plan DConflict

LotFit

Lots

Which pre-approved home fits this lot, and exactly where.

LotFit tests every plan in a published pre-approved catalogue against the lot and that jurisdiction's rules, and returns a cited report.

  • Covers setbacks, height limits, lot coverage and solar access
  • Guided capture on a phone; calibrated precision on every report
  • LotScreen: the desk view that screens parcels before the walk

For infill builders, housing non-profits, architects and homeowners.

Front elevation · measured± 0.3 ft
W1D1W2R1
  • W1 · window3.0 × 4.0 ft ± 0.3§ [program rule]
  • D1 · door3.0 × 6.8 ft ± 0.3§ [program rule]
  • R1 · roof area[area] sq ft§ [program rule]

RehabScope

Buildings

The outside of an existing building, measured and cited.

The same walk, aimed at a building before rehabilitation: a cited exterior pre-screen for a bid or a funding file.

  • Openings, wall and roof areas, clearances, each with a photo, a measurement and the program rule it serves
  • Checks eligibility against published rehab and weatherization programs
  • Exports shaped for the auditor's and the contractor's workflow

For housing non-profits, weatherization contractors and owners.

03 Built to scale

Built on AI, grounded in the law.

Agents capture the property, the law is mapped into testable rules, and the engine computes an answer you can check.

A

Seeing the property

The agents guide the walk in real time: they check what is still missing and send you where to look next. Vision models turn the walk into a 3D model of the lot and find the walls, roofs, windows and trees that matter.

B

Reading the code

Building codes are written for lawyers. BuildNexus maps each one into a structured model of the law: every requirement, exception and cross-reference as a precise, testable rule, linked to its source.

C

Computing the answer

The answer is computed, not generated. The same lot and the same rules give the same answer, every time.

D

Connecting law and land

Every rule, lot, design and result is linked, so any number traces back to the clause and the measurement behind it.

04 Walkthrough

See it work: from the lot to the law, in five steps.

1 · Scan

A guided walk, directed by the app.

Walk the lot. The app states what the rules still need and where to walk next, until coverage is complete.

Step 1 of 5
What the product showsStep 1 / 5
! North line · partialWalk the north fence,corner to cornerCoverage 2 of 4Coverage2 of 4 completePerimeter loop✓ ClosedNorth line“Walk the north fence,corner to corner”! PartialSide lines✓ CoveredCalibration“Measure between thetwo markers.”! Pending

05 Who we are

Certainty on every property, before a dollar is spent.

  1. Building codes
  2. City ordinances
  3. Construction

BuildNexus works at the intersection of building codes, city ordinances and construction.

We bring AI to builders so they can follow the rules, capture a property and decide with confidence and speed. Two products do that today; the right partners can take it much further.

Open to3 ways in
  1. 01Research collaboration
  2. 02Pilots with builders and non-profits
  3. 03Technology and data partnerships

Have a project, a program or an idea in this space? We’d like to explore it with you.