Site Pack: how to connect
Free tools a UK builder's AI assistant uses on the job: permitted development and Building Regulations checks, Party Wall Act notice dates, CDM 2015 duties and F10, brick, block, concrete and plasterboard quantities, and structural emergency triage.
Site Pack is a remote MCP server: a set of tools your AI assistant can call. You do not open it like a website. You add its address to your AI app once, then just talk to your assistant as normal.
Server address: https://site-pack.nerolabs.workers.dev/mcp
Sign-in: None. No account, no key and no sign-in: add the address and use it.
Connect it in Claude
- Open Claude (claude.ai or the desktop app) and go to Settings, then Connectors.
- Choose Add custom connector. Name it Site Pack and paste
https://site-pack.nerolabs.workers.dev/mcpas the URL. - Save, then turn it on in a chat from the tools menu.
Claude Code: claude mcp add --transport http site-pack https://site-pack.nerolabs.workers.dev/mcp
Connect it in ChatGPT
- In ChatGPT go to Settings, then Apps and connectors, then Advanced settings, and switch on Developer mode (needed for any custom connector).
- Back in Apps and connectors, choose Create. Name it Site Pack, paste
https://site-pack.nerolabs.workers.dev/mcpas the MCP server URL and pick No authentication. - Tick that you trust the app and press Create. Then pick it from the tools menu in a new chat.
Other MCP apps (Cursor, VS Code, Windsurf, Gemini CLI and more)
Add a remote server with the Streamable HTTP transport. Most apps take a JSON block like this:
{
"mcpServers": {
"site-pack": { "type": "http", "url": "https://site-pack.nerolabs.workers.dev/mcp" }
}
}
Three things to try
The tools
| Tool | What it does |
|---|---|
list_capabilities | What Site Pack can do Lists Site Pack's tools, the date its rules were last checked, what it covers (nations, project types, work types) and what it deliberately does not do. |
check_permitted_development | Planning: permitted development or not? (England) Checks a householder project in England against the permitted development limits in the GPDO 2015, Schedule 2, Part 1: single and multi storey rear extensions, side and wraparound extensions (Class A), loft dormers and hip to gable (Class... |
check_building_regs | Building Regulations: notifiable, which route, which Parts? (England and Wales) For one or more kinds of building work in England or Wales: is it notifiable building work, exempt (small outbuildings, ground level conservatories and porches up to 30 m2), self-certifiable by a competent person scheme (FENSA, Certass,... |
party_wall_notices | Party Wall Act notices and dates (England and Wales) Works out which notice the Party Wall etc. |
cdm_duties | CDM 2015 duties and HSE F10 notification For a construction project in Great Britain (domestic by default): who holds the client's duties (on a domestic job they pass to the contractor, the principal contractor, or the principal designer under a written agreement), which roles... |
estimate_materials | Bricks, blocks, mortar, concrete and plasterboard quantities Works out quantities from dimensions, with the working: bricks (60 a m2 per half brick leaf), blocks (about 10 a m2), cavity walls with ties, mortar from wall volume minus unit volume, cement bags and sand tonnes for a chosen mix, concrete... |
structural_triage | Structural worry: how urgent, and safe first steps First-response triage when a customer reports a crack, a bulging or leaning wall, a sagging or fallen ceiling, a collapse, storm damage to a roof or chimney, a fallen tree or vehicle impact, a sagging floor, problems after a wall was... |
trade_profile | Check the builder's business details Checks the builder's own business details (Nero Trade Profile v1: trading name, Companies House number, trade body or scheme and membership number such as FMB or TrustMark, postcode, contact) and returns them cleaned, with a stable... |
Good to know
- Built for UK builders. Every answer shows its working and sources and lists what the trade must check. The trade doing the work stays responsible for it.
- Free forever: no sign-up, no key, no daily cap, no paid plan.
- What is stored and how to delete it: see Privacy.
Support
Email founder@neroengine.com. Say which tool you used and what you asked; we reply within 2 working days.
Nero Engine Group Ltd (company 16521432, England and Wales), trading as Nero Labs. Page updated 12-11-2026.