> ## Documentation Index
> Fetch the complete documentation index at: https://docs.horizonmanaged.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Construction & bid

> The Bid engine, Drawings, and Field survey ship — AI-assisted takeoff, versioned site drawings with 3D floor-plan analysis, and iPad pre-bid walkthroughs that convert straight to a bid.

End-of-week ship, extending the [v1.14.x platform](/changelog/2026-07-01).
Three new product areas cover pre-bid site work, drawing management, and
construction / low-voltage bidding.

## New features

### Bid engine

Construction, low-voltage, and electrical bidding — replaces an Excel cost
workbook with a deterministic server-side cost engine and AI-assisted takeoff.
Upload spec documents and drawings and NEXOS CORE reads the drawings with
Claude Vision to count devices, generates trade-grouped line items, applies
issued addendums via a reviewable diff, writes a scope-of-work narrative, and
runs a red/yellow/green pre-submission audit that blocks submit on red
findings. Cost math is deterministic — material + tax + subs + equipment +
labor + burden roll up to hard cost, then overhead, profit, contingency,
commission, sales tax, permits, and bond to grand total, with profit
per man-day, margin %, and an optional manual bid-price override. See
[Bid engine](/bidengine/index).

### Drawings

System of record for a client site's technical drawings — floor plans, network
and riser diagrams, cable paths, rack elevations, conduit layouts, and
as-builts. Uploads support 11 drawing types up to 64 MB with full revision
history, scoped to a company, survey, bid, or project. Run **Analyze floor
plan** on an image drawing and Claude Vision extracts rooms, doors, corridors,
and safety features to render a server-side **isometric 3D view** — no
plugins, just SVG. For drawings attached to a bid, an AI takeoff counts
low-voltage devices and cable runs and feeds the [bid engine](/bidengine/index)'s
reconciliation, gated to the trades that bid actually covers. See
[Drawings](/drawing/index).

### Field survey

iPad pre-bid site assessment for low-voltage and IT infrastructure work. A
tech walks a prospective job site and captures a room-by-room inventory —
**GPS-tagged photos** grouped by area and floor, **voice notes** that Claude
transcribes and extracts into structured survey items and area attributes
(ceiling type, height, square footage), and **AI equipment detection** that
reads nameplates from photos for manufacturer, model, serial, plus a
photo-quality score and code-violation flags (NEC, NFPA 72, TIA-568, UL 294).
A completed survey converts one-tap into a draft [bid](/bidengine/index) —
each area becomes a section and each item needing work becomes a line item,
with pricing added downstream. See [Field survey](/survey/index).

## Known limitations

* **Bid engine** — AI takeoff, reconcile, addendum diff, and scope summary
  require your tenant's Claude API key and carry a per-drawing cost.
  Confidence scores on generated line items are AI estimates — verify before
  submit. The **Dedupe by tag** heuristic on Vision Findings can drop a
  legitimate sheet; review before applying.
* **Drawings** — AI features are **image-only** (PNG/JPG/WebP). PDF, DWG, and
  SVG files are stored but can't be analyzed. **Drawing annotations (pins,
  notes, measurements) aren't available yet.**
* **Field survey** — **voice capture is transcript-only** (no audio file is
  stored) and depends on the browser's speech recognition, so non-Chrome/Safari
  browsers won't capture. GPS coordinates come from the device and aren't
  server-validated. AI detection is on-demand and needs your tenant's Claude
  API key. Conversion to a bid requires the survey to be marked **completed**.

Earlier [known limitations from v1.14.x](/changelog/2026-07-01#known-limitations),
[week of June 29](/changelog/2026-07-02#known-limitations), the
[Quotes, billing & contracts ship](/changelog/2026-07-02-quotes-billing#known-limitations),
and the [Projects & field ship](/changelog/2026-07-03-projects-field#known-limitations)
remain unchanged.