The interior design guide
Open Rayon

The interior design guide. A definitive knowledge base for interior designers.

From first principles to the finishing touches: shell, surfaces, space planning, furniture, electrics, plumbing and joinery, in the order a project runs.

Get startedKnowledge base

The Lexicon.

Every term, in plain words.

From hue and light reflectance to bonding and kick space, every term the guide uses has a short definition, what to know in practice and the pages that use it.

Open the Lexicon

Use the guide in your AI assistant.

Connect Claude or ChatGPT.

The guide has an MCP server, so your assistant can search it, read its pages and cite them while it answers you. It is free, read-only, and needs no account or key.

Connect to Claude
Open docs
All sections

The interior design guide.

A definitive knowledge base for interior designers.

Eleven chapters take a home from first principles to the moment you show it to the client. Start with Foundations and read in order, or search for a topic, a term or a rule of thumb.

Chapters.

Eleven steps, from principles to presentation.

Keep reading.

Where to go next.

Space planning.

Where does everything go, and how do people move between it?

Space planning decides where everything goes and how people move between it. Working from the plan, this chapter covers zoning an open space, keeping circulation clear, fitting furniture with its clearances, and testing a layout before anything is bought.

Next

Sections.

Everything about space planning.

Planned

Zoning an open plan

Making one open space work as several rooms without walls.

Ready soon
Planned

Circulation and clearances

Routes, widths and the free floor every activity needs.

Ready soon
Planned

Furniture layouts that work

Arranging rooms around use, light and conversation.

Ready soon
Planned

Doors, swings and openings

Choosing door types and swings so they never block the room.

Ready soon
Planned

Testing a plan at 1:50

Drawing furniture to scale to check a plan before anything is bought.

Ready soon
Planned

Planning a small flat

Making every square metre count in a compact home.

Ready soon

Keep reading.

Where to go next.

Units