One of the most common requests we receive is surprisingly difficult to answer accurately:

“Can you provide a Revit model?”

The challenge is that a Scan to Revit model is not a single, standard product. Two projects can both request a “Revit model” and receive deliverables that differ significantly in scope, detail, cost and usefulness.

Should the model include architecture only? Structural elements as well? What about MEP services hidden above ceilings or inside risers? And what level of detail is actually required for the project?

Understanding these decisions before requesting a quote helps ensure you receive a model that supports your project goals without paying for unnecessary information.

Why “A Revit Model” Is Not Enough Information

Unlike traditional drawings, Revit models can contain varying amounts of information depending on how they will be used.

A measured survey Revit model can include:

Architectural features
Structural elements
Mechanical services
Electrical systems
Plumbing systems
Plant equipment
Site information
Asset data
BIM parameters and metadata

The more information included, the greater the modelling effort required.

That means project purpose is often the most important factor when defining Revit model deliverables.

For example:

A planning application may only require architectural geometry.
A refurbishment project may need architectural and structural elements.
An MEP redesign project may require detailed service modelling throughout the building.

Before discussing price, it is important to define exactly what the model needs to achieve.

Architectural Modelling: The Foundation of Most Scan to Revit Projects

For many projects, architecture forms the core of the Scan to BIM model.

Architectural modelling typically includes all visible building elements that define the layout and physical form of the space.

Walls, Floors and Ceilings

These are usually the primary components included in architectural models.

They establish:

Room layouts
Floor areas
Building geometry
Vertical relationships between spaces

Accurate floor and ceiling modelling is particularly important for refurbishment, fit-out and space-planning projects.

Doors and Windows

Openings are often critical for design development and coordination.

Architectural Revit models commonly include:

Door locations and dimensions
Window locations and sizes
Glazing systems
Entrance features

Depending on the required level of detail, these may be represented as simplified survey families or more detailed modelled components.

Internal and External Features

Additional architectural elements may include:

Stairs
Balustrades
Ramps
Lift shafts
Roof structures
Facade features
Fixed joinery

The scope should always be aligned with the project’s design requirements.

A fit-out project, for example, may require highly detailed internal features, while a planning project may only need simplified representations.

Structural Modelling: Understanding the Building Framework

Structural modelling adds another layer of information beyond architectural geometry.

This is often valuable for engineers, architects and contractors working on alterations or refurbishment schemes.

Columns and Beams

Structural models frequently include:

Concrete columns
Steel columns
Structural beams
Transfer structures
Bracing elements

These components help design teams understand load-bearing constraints and available space for modifications.

Slabs and Structural Floors

Structural floor elements can be modelled separately from architectural finishes.

This distinction becomes particularly important when:

Assessing floor penetrations
Designing new service routes
Coordinating structural alterations
Evaluating load paths

Steelwork and Complex Structures

In commercial and industrial buildings, exposed steelwork often plays a significant role in project coordination.

Depending on survey access and project requirements, models may include:

Primary steel frames
Secondary steel members
Trusses
Structural support systems

Not every project requires this level of detail, but where structural interventions are planned, accurate modelling can significantly reduce design risk.

MEP Modelling: The Most Variable Part of a Revit Survey Model

MEP scope is often where the biggest differences in cost and complexity occur.

Mechanical, electrical and plumbing systems can range from basic visible services to highly detailed coordinated models.

The level of access available during the survey also plays a major role in determining what can realistically be captured.

Visible Services

A typical MEP survey model may include visible:

Ductwork
Pipework
Cable trays
Containment systems
Lighting fixtures
Air handling equipment

These elements are often captured in plant rooms, exposed ceilings and service areas.

Plant Rooms and Service Areas

Plant rooms usually contain high-value information for future design work.

Models may include:

Boilers
Chillers
Pumps
AHUs
Water treatment equipment
Major service connections

For refurbishment and upgrade projects, these areas often justify detailed MEP modelling.

Risers and Vertical Distribution

Service risers are frequently critical to future design decisions.

Accurately modelling risers helps engineers understand:

Existing capacity
Routing opportunities
Coordination constraints
Future expansion options

Where access is available, risers often provide some of the most valuable information within an MEP survey.

Ceiling Voids and Hidden Services

One of the most common misconceptions is that every service can be captured during a survey.

In reality, hidden services can only be modelled if they are visible during data capture.

Access limitations may affect:

Ceiling voids
Service shafts
Roof plant areas
Restricted zones
Occupied spaces

This is why survey access requirements should always be discussed before project commencement.

How LOD Affects Revit Model Scope

Another important consideration is Level of Development (LOD).

LOD does not simply refer to how detailed a model looks. It also influences how accurately elements are represented and what information they contain.

A lower LOD Revit survey may focus on overall geometry and spatial coordination.

A higher LOD model may include:

More detailed component representation
Additional BIM parameters
Enhanced asset information
Greater modelling accuracy

The appropriate LOD depends entirely on how the model will be used.

A planning-stage project rarely requires the same level of detail as a complex hospital refurbishment or MEP coordination exercise.

If you’re unfamiliar with the different LOD classifications, read our guide on LOD, where we break down the differences between LOD 100, 200, 300, 400 and 500 and explain how choosing the right level can help control project costs.

Defining LOD early helps prevent misunderstandings and ensures the model meets project expectations.

Common Exclusions and Survey Limitations

No survey model can include information that was not visible or accessible during capture.

Understanding typical exclusions helps avoid unrealistic expectations.

Common exclusions may include:

Hidden structural elements
Concealed services
Internal wall build-ups
Foundation details
Underground utilities
Behind-wall systems
Equipment hidden within enclosures

In some cases, assumptions may be required where complete visibility is not possible.

These assumptions should always be clearly documented within the project scope.

The most accurate Revit model is not necessarily the one with the most elements—it is the one that clearly defines what was surveyed, what was modelled and what assumptions were made.

How to Define the Right Revit Model Scope?

Before requesting a Scan to Revit quote, it helps to answer a few key questions:

What Is the Model Being Used For?

Different uses require different levels of information.

Examples include:

Planning applications
Refurbishment design
MEP redesign
Clash detection
BIM coordination
Asset management
Facilities management

Which Disciplines Need the Model?

Consider whether the project requires:

Architecture only
Architecture and structure
Architecture, structure and MEP

The answer can significantly affect both cost and modelling effort.

What Areas Need to Be Surveyed?

Clearly identify:

Accessible spaces
Plant rooms
Roof areas
Service risers
Ceiling voids
Restricted locations

This helps define realistic deliverables from the outset.

Get the Right Revit Model Before Requesting a Quote

The most successful Scan to Revit projects begin with a clear understanding of what information is needed and why.

Rather than simply requesting “a Revit model,” defining the architectural, structural and MEP requirements upfront helps ensure you receive a deliverable that supports your project objectives while avoiding unnecessary modelling costs.

At Scene3D, we work with architects, BIM managers, engineers and project teams to define the right model scope before pricing begins. Get in touch and tell us how the model will be used, and we’ll help you determine exactly which elements should be included to maximise value and minimise risk.