THOM MICRO SYSTEMS

Revit Room Boundaries

Rooms are powerful objects and an essential part of Revit for scheduling information.  It’s important to make sure they are placed correctly and although they are placed in plan view, they are a 3D element enclosing the entire volume that they are allocated to. Rooms automatically pick up bounding elements such as walls, floors and ceilings - and you can use the Highlight Boundaries tool as an aid before placement.

However, you should also be aware of how they associate to levels and how you can utilise the Limit Offset property. When there is no physical element for the Room to be bound by then we can associate it with the Level above, but this can often lead to areas of the building being missed resulting in inaccurate volume calculations – such as the case below where the room volume should include the space up to the underside of the roof but instead incorrectly stops at the Roof Line Level.

By setting the room’s Limit Offset we can force it to go above the level it is associated to and therefore include the empty roof space – this is also important when relating to the Space tool for MEP calculations. 
Note that Revit now defaults to using the underside of the roof as a bounding element and will report the room volume correctly.

Useful Note – Walls, floors, roofs, ceilings, architectural columns and  curtain systems all have an instance property built in to make them ‘Room Bounding’ this is a tick box which can be switched on or off as necessary.

We hope you enjoy these tips!

Related Articles

AutoCAD – Importing PDFs

AutoCAD – Importing PDFs

Working with drawings in PDF format is common, particularly when sharing information with clients, contractors or other project teams. However, what happens when you need to make changes to a drawing but only have a PDF available?  Rather than recreating...

The Overkill and Selection Cycle Commands

The Overkill and Selection Cycle Commands

Overlapping lines and duplicate objects can make AutoCAD drawings more difficult to manage. They can also lead to unnecessary geometry, selection problems and larger drawing files.  Fortunately, AutoCAD includes two useful tools to help manage these issues:...

Scotties in the City

Scotties in the City is a major public art trail coming to Glasgow in summer 2026, featuring colourful Scottie dog sculptures designed by artists, schools and community groups. Organised by Maggie's and Wild in Art, the trail will encourage visitors to explore the...