The interior design guide
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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.

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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.

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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.

Sections.

Keep reading.

Where to go next.

About the guide,

who makes it and how it is written.

The interior design guide is a free knowledge base for interior designers. It explains how space, colour, light, sound, temperature and style work in a home, then walks through the decisions a project runs through, in the order they are made.

Who makes it.

Rayon.

The guide is written and maintained by the team at Rayon, the collaborative design app. It is free to read, to share and to cite, and it carries no advertising.

How it is written.

Practice first, sources named.

Each page starts from established design practice and from the published standards that govern it, such as the ADA Standards for Accessible Design or the International Building Code. A number that comes from a rule always names the rule, its jurisdiction and its edition. Measurements are metric, and the units switch converts them to imperial. Figures are drawn to explain an idea, not to scale a project, and every page shows when it was last updated.

Using it with AI.

Your assistant can read it too.

The guide is published for people and for AI assistants alike. Its pages, its Lexicon and its answers are available as plain text, and its MCP server lets Claude or ChatGPT search the guide and cite the pages they used.

Terms of use.

Read, quote and link freely.

The guide and everything in it, including its text, figures, drawings and 3D model, is © 2026 Rayon. All rights reserved. You may read it, share links to it, and quote short excerpts with a link to the page they come from. You may not copy, scrape or republish the guide or a substantial part of it, in any form, or use it to build, train or publish a competing guide, course, book or product, without written permission from Rayon. Search engines and AI assistants may read the guide and cite it, as they would any public page.

Corrections.

Tell us what to fix.

If something is wrong, out of date or missing, write to the Rayon team through rayon.design. Corrections are made on the page itself, and its update date changes with them.

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