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.

Electricals.

Where does every wire, socket and light point go?

Every lamp, socket and switch depends on a cable that goes in long before the room is finished. This chapter maps the electrical plan from the consumer unit to each point, so lighting, power and data land exactly where the furniture plan needs them.

Next

Sections.

Everything about electricals.

Planned

The socket plan

Drawing every socket from the furniture plan, room by room.

Ready soon
Planned

Switches, circuits and scenes

Where switches go, how circuits split and how scenes are set.

Ready soon
Planned

Ceiling spots: grid or wall wash

Laying out downlights by purpose rather than by grid.

Ready soon
Planned

Floor sockets for floating furniture

Powering sofas and desks that sit away from the walls.

Ready soon
Planned

Kitchen and bathroom circuits

The dedicated circuits and safety zones wet rooms need.

Ready soon
Planned

Data, TV and charging points

Planning screens, routers and chargers before the walls close.

Ready soon

Keep reading.

Where to go next.

Units