Existing Conditions, Measured Surveys & Revit Base Plans

Existing Conditions & Revit Documentation · Long Island

A renovation starts on much firmer ground when the existing building is documented correctly. Baca Williamson Architects, PLLC measures homes and buildings, prepares existing-condition drawings and develops Revit base models that can support design, consultant coordination and permit drawings.

Good drawings begin before design.

If older plans are missing, incomplete or no longer match the building, we can document the current condition before larger design decisions are made.

• Measured field documentation

• Existing-condition plans

• Revit/BIM base models

• Permit and coordination backgrounds

When this service helps

• You are planning a renovation, addition or interior alteration.

• The owner does not have accurate existing floor plans.

• Older drawings do not match what is built.

• An interior designer, contractor or engineer needs a reliable base plan.

• A permit, legalization or maintain filing requires existing-condition documentation.

• The building has complicated geometry, multiple levels or older construction.

What we may prepare

• Field measurements using laser measuring equipment.

• Existing floor plans and reflected ceiling information where needed.

• Exterior elevations or selected building sections when in scope.

• Door, window and opening documentation.

• Revit/BIM base models for design and coordination.

• Drawing backgrounds for consultants or later permit sets.

The workflow

1. Understand the purpose. We confirm why the drawings are needed: design planning, consultant coordination, permit filing, legalization, real-estate review or another use.

2. Review existing records. If surveys, old plans, certificates, photographs or municipal records are available, we compare them with the intended scope.

3. Measure the building. We field-measure relevant spaces using laser measuring tools and document rooms, walls, openings, stairs and ceiling conditions.

4. Build the Revit base. The field information is organized into a Revit model so plans, elevations and coordination backgrounds come from one source.

5. Draft and check. We prepare the existing-condition drawings and review them for consistency before they are used by the project team.

6. Move into design. The base drawings can support schematic design, interior layouts, structural coordination, permit documents or construction planning.

Common questions

Is this the same as a property survey?

No. A property survey typically documents boundaries and site information. Existing-condition drawings document the building itself: rooms, walls, openings, stairs and other architectural conditions. Many projects need both.

Do you always need laser scanning?

Not always. Some spaces can be measured with conventional laser tools and careful field notes. More complex buildings may benefit from point-cloud documentation. We match the method to the project instead of overselling the technology.

Can the drawings be used for permits?

Existing-condition drawings often become part of a larger permit, legalization or renovation drawing set. The exact requirements depend on the municipality, the scope of work and whether proposed changes are included.

Where can I see an example?

See the Montauk Existing Conditions Survey & Revit Floor Plans case study: /residential-projects/montauk-existing-conditions-plans

Related services

Existing-condition documentation often supports Home Additions & Dormers, Legalization of Existing Work, Maintain Filings, Pre-Purchase Zoning & Feasibility Reviews and broader Permits, Zoning & Approvals.

Need reliable existing drawings?

Tell us what records you have, what you are planning and where the property is located. We will help determine what needs to be measured, modeled and drawn before the next step.

Discuss Existing Conditions: /contact