Project Types / Renovations & Extensions

Renovations and extensions, working from what's actually there.

Film the existing building, get a 3D scan back and design the new work against real conditions instead of drawings that may not match.

Your CAD does its job. Harth does the rest.

Bring the model in from Revit, Archicad, SketchUp, or IFC. Nothing gets migrated, and nothing changes about how you document.

How it works

  1. 01

    Capture what's there

    Walk the building with a 360 camera. Harth turns the footage into a navigable 3D scan.

  2. 02

    Pin a project to it

    Work against the scan, with the existing conditions in front of you.

  3. 03

    Design the new work

    Model the addition, check it against real geometry, and see how it meets what's already built.

  4. 04

    Show the client

    Renders and walkthroughs off the model, collected into a board. Share a link, not the workspace.

From the site to the conversation that decides it.

The site, before anything is drawn.

The site, before anything is drawn.

Explore options until it feels right. Visualize any space in minutes. See as many different finishes as you can think of. Swap the moodboard for reality.

Directions you can test cheaply

Directions you can test cheaply

Move walls, shift the massing, try the other orientation. Explore more while a change still costs a conversation instead of a redraw.

Sun on the actual site

Sun on the actual site

Set the month and the time and look at the shadows – on this site, at this latitude, with the neighbors casting theirs too.

Where the plan meets daily life

Where the plan meets daily life

Circulation, daylight, layouts, accessible routes. Agents that know what makes a building work, not just what fits.

Clients who decide early

Clients who decide early

Most clients build once. Renders and a walkthrough off the real model let them react early, while the ideas are still open.


The drawings are rarely the building.

Older buildings have been altered, patched, and extended, and the documentation seldom kept up. A scan gives you what's there now; measurable, navigable, and attached to the project.


Frequently asked questions

A consumer 360 camera and a slow walk through the space. No specialist operator, no survey booking.

Start with a model you've already drawn.