Scan to BIM for Renovations: What a Point Cloud Gives Your Architect, and Where a Surveyor Still Comes In

Most renovation rework starts before anyone picks up a tool. It starts with an existing-conditions drawing that was slightly wrong: a wall a few degrees out of square, a ceiling that drops in the hallway, a steel beam nobody drew in 1987.

Scan to BIM replaces the tape measure and the old plans with a capture of the building as it actually stands. This guide explains what a point cloud is, what your design team receives, where it saves time and money on alterations, and, just as important, where a registered surveyor is still the right call.

Sheet 02 // Captured point cloudScale NTS

Stations

07 · cloud-to-cloud

Registration

One coordinate system

Export

.E57 · .RCP · .RCS

Next

Model to LOD 300

Registering stations

Why existing conditions cause design rework

An alteration is only as good as the base drawing it's designed on. On existing buildings, that base is usually the weakest document in the set.

• Original plans rarely match the building. Decades of extensions, removed walls and undocumented repairs pile up between the archive drawings and what's standing today.
• Hand measurement misses what isn't square. Tape and laser-distance surveys assume straight walls and level ceilings. Older buildings have neither.
• The hard parts are overhead and inside. Bulkheads, beam depths, raked ceilings and service runs are exactly where clashes hide, and exactly what's hardest to measure by hand.
• Every return trip costs time. One missing dimension means another site visit, another day on the program and another conversation with the client.

The result shows up late: joinery that doesn't fit, steel that clashes with ducting, and redesign after the client has signed off.

Reality capture technology: from LiDAR sweep to point cloud

Reality capture records a building with light instead of a tape. A LiDAR scanner set up at a series of stations sends out laser pulses and measures how long each one takes to return, building millions of individual 3D points. Each station's sweep is then aligned with the others into one registered point cloud: a dense, measurable copy of every surface the scanner could see.

We capture on a Matterport Pro3:

• Class 1 eye-safe LiDAR at 100,000 points per second, safe in occupied buildings and around working trades.
• Up to 1.5 million points per sweep, from interiors through to façades.
• 134MP HDR panoramas at every station, so the point data comes with photographic context.
• IP43-rated and direct-sunlight capable, so glazed spaces, decks and elevations capture as cleanly as interiors.

The point cloud is the raw material. What your team actually works in depends on the deliverable you choose.

What the design team receives

Our Scan-to-BIM services cover four levels of output, from raw data to a parametric model. Most renovation projects need one or two of them.

• Registered point cloud (.E57, also .RCP / .RCS). Uncompressed, high-density data that opens in Autodesk ReCap, Revit, Navisworks, Archicad and Bentley. Your team models directly against it.
• Scan-to-CAD 2D as-builts (.DWG / .DXF). Dimensioned floor plans, reflected ceiling plans and elevations, drafted from the point cloud. The fastest route to an existing-conditions set.
• Scan-to-BIM Revit models (.RVT / .IFC). Parametric architectural and structural models, modelled to the level of development your brief needs, from LOD 200 to LOD 350.
• MatterPak™ add-on (.OBJ / .XYZ). An optional, lighter package: a mesh and point cloud that give a draftsperson a spatial reference to model against, with reflected ceiling plan imagery.

What LOD 200, 300 and 350 mean

Level of Development describes how much you can rely on each element in a model. The BIMForum LOD Specification defines them like this:

• LOD 200: elements are generic, with approximate size, shape, location and orientation. Good for massing and early options.
• LOD 300: elements are specific, with defined size, shape, location and orientation. The usual target for design development and documentation.
• LOD 350: as LOD 300, plus the interfaces with other building systems. Use it where coordination and clash review matter most.

Specify the LOD per element group in your brief. Modelling everything to LOD 350 when walls only need LOD 300 adds time without adding value.

"Point cloud survey" or registered survey? Where a surveyor still comes in

People often search for a "point cloud survey" when what they need is a measured record of an existing building. That's what a point cloud gives you, but it isn't a survey in the legal sense, and the difference matters on a renovation.

Our capture is an architectural-grade capture: a high-fidelity spatial reference for design and coordination. It's the right tool for:

• Existing-conditions plans, sections and elevations
• Modelling the building for alteration design
• Clash review before steel, ducting or joinery is fabricated
• Heritage and condition records

A registered surveyor is still the right call for:

• Boundaries. In Queensland, only surveyors registered with the Surveyors Board of Queensland can carry out cadastral surveys (Business Queensland).
• Levels. Site levels tied to a survey datum stay with a registered surveyor.
• Set-out. Fabrication-critical set-outs are confirmed on site before anything is built to them.

The two work best together. The surveyor fixes the boundaries and levels; the point cloud fills in everything inside them.

Where Scan to BIM pays off on renovations

Clash review before fabrication

Overlay proposed structural steel or HVAC ducting on the as-built point cloud and catch conflicts before anything is fabricated off site. Finding a clash on screen costs minutes; finding it on site costs a reorder and a delay.

Council DA support

Existing-condition floor plans and elevations give your designer a faster, more reliable starting point for a development application.

It matters most on character homes. In Brisbane, the Traditional Building Character overlay is intended to maintain the pre-1947 streetscape, and changes that don't comply with the overlay code need a development application (Brisbane City Council). An accurate record of the existing Queenslander, inside and out, is where that application starts.

Heritage and dilapidation records

A date-stamped baseline of mouldings, visible cracking and boundary walls, captured before neighbouring works begin. For the full picture, see our guide to pre-construction condition surveys.

Through construction and handover

Once the alteration is underway, the same technology records the new frame before the walls close. Builders can read more in our guide to as-built 3D scanning.

How a Scan-to-BIM job is scoped

Commercial and BIM work is quote only, because every building and brief is different. Scoping takes three steps:

1. Dimensions. The site footprint, level count, structural complexity and location.
2. Deliverable. The point cloud format, the CAD or BIM format, and the LOD the brief needs.
3. Dispatch. You receive a fixed quote, a capture plan and a SWMS. Our crew mobilises within 24–48 hours of go-ahead.

Send the brief and we return a scope proposal within 24 hours. Request a BIM scope proposal

The same process covers vessels: hulls, engine rooms and cabins for refits and naval architects. See the AEC and marine scoping protocol.

Scan to BIM FAQs

Design on the building that's actually there

Send us the address, the deliverable you need and the LOD in your brief. We'll return a scope proposal within 24 hours, with a fixed quote and a capture plan. Every project is scoped on request.

rchive is owner-operated from the Sunshine Coast and captures across South East Queensland, from Gympie and the Sunshine Coast to Brisbane Metro, with Gold Coast projects scoped on request.

Request a BIM scope proposal, or initiate comms on 0437 596 350.

Measurement note: our data is a high-fidelity spatial reference for design and coordination. Fabrication-critical set-outs are confirmed on site, and boundary and level surveys remain with a registered surveyor.