What's new

Changes to the tool and the site, newest first. Rules, standards and links were last checked on 21 October 2026.

13 November 2026

Undo and redo for every change to a build-up (Ctrl+Z and Ctrl+Y).
Far more realistic materials in the 3D view: varied brickwork, coursed stone, roughcast render, grained timber, foil-faced boards and lapped roof tiles, with relief that catches the light.
A light theme (the button in the top bar), and the tool now opens offline and can be installed as an app.
Download a backup of your saved build-ups, and restore it in any browser.
Typing slips are caught: thickness and conductivity have sensible limits, and a layer with no thickness says so.
The Check step now opens with the overall verdict.
Insulation suggestions only offer materials that can be built in that position, and insulation in a masonry cavity has to be a cavity product.
On phones and tablets the 3D model comes first.
A new system, solid stone wall with lath and plaster: 70 systems in all.
A shorter feedback survey, and terms of use.

Layer choices are checked for fit: a material that can't go in a position is greyed out with the reason.
Wall ties are drawn where they are really bedded, and stay in place when the layers are spread.
Insulation thicknesses use the sizes products are sold in.
New name and address: Build-up Atlas, at buildupatlas.co.uk.
A privacy page. No cookies, and saved work stays in your browser.

Find a build-up: set a U-value, fire and moisture target and get the systems that meet it, lowest carbon first.
Guide pages with the U-value, layers and section drawing of every system, and a page of UK U-value limits.
A new layout with Build, Check and Report steps.
The feedback survey.

Found a mistake, or want something added? Use the feedback form.