Construction Drawing Analyzer

Drawing Analyzer — Claude AI Skill for Construction Drawings

THIS SKILL AHS BEEN ARCHIVED> KINDLY USE THE OTHER SKILL THA CONVERTS PDF DRAWING IN TO VECTOR DATABASE

Pre-process a set of construction drawing PDFs into structured text indexes so Claude can answer questions **faster, cheaper, and more accurately**.

Built by [Hamza Abdul Jabbar](https://hamzajabbar.online) | AutoConst

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The Problem

Raw construction drawing PDFs are terrible AI input.

• Claude breaks images into 16×16 pixel tiles — tiny drawing details get lost
• A semi-dashed line (cold water) looks identical to a double-dashed line (hot water) at tile resolution
• Merged drawing sets regularly fail to upload even under the 30MB limit
• Claude Cowork burns 60,000–70,000 tokens per question processing the full PDF set every time
• Element counts are approximate — overcounting is common
• Cross-references between sheets are not followed

The Solution

Run this skill **once** on a new drawing set. It builds lightweight text indexes. Every future question reads the indexes first, then targets only the specific sheet needed.

	Raw PDF approach	Drawing Analyzer
Tokens per question	60,000–70,000	5,000–8,000
Time per question	5–10 minutes	30–60 seconds
Footing count accuracy	Overcounts	Correct, by type
Area takeoff accuracy	Visual estimate	96% tested
Symbol interpretation	Guesses	Reads actual legend
Cross-references	Not followed	Mapped and followed

Real result

Warehouse slab area on an 11MB drawing set:

• Drawing Analyzer: 13,250 m²
• Manual Bluebeam measurement: 13,600 m²
• Accuracy: 96.7%

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What it produces

your-project/
├── indexes/
│   ├── drawings.md              # Master register — loaded on every query (~5KB)
│   ├── sheet-classification.md  # Every sheet classified by type and content
│   ├── cross-reference.md       # Which drawings reference which other drawings
│   └── symbol-librar