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.

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.

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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.

Hanging line.

What it means in interior design.

A hanging line is a shared centre height for art, so pieces of different sizes still align. Galleries typically use about 145–150 cm from the floor, close to average eye level.

In practice

Art hung too high is the most common styling mistake; when in doubt, go lower. Above furniture, leave roughly 15–25 cm between the sofa back and the frame so they read as one group.

Where the guide uses it

  • Defined here, in the Lexicon.
Units