Hello, deZZign readers! Today we want to share the minimum set of drawings a designer should provide so that a project can be priced accurately and construction can start.
It is no secret that many people buying a home don't see why they need an interior design project - until the contractor starts quoting prices for work and materials and the numbers come as a shock. A proper set of drawings prevents that: the project is built as close as possible to the renderings, you can choose materials that fit your budget, and you can test a material in the rendering before committing to it.
Here is the minimum list that allows work to proceed and costs to be calculated:
- As-built (measured) drawings with existing utilities.
- New partition plans with door and window openings marked.
- Decorative details and sections of drywall construction.
- Furniture and equipment layout plans.
- Underfloor heating and radiator layout with thermostat locations.
- Radiator specification.
- Floor finish plans.
- Flooring specification.
- Reflected ceiling plans.
- Ceiling details and sections.
- Plumbing fixture layout.
- Plumbing fixture specification.
- Floor tile layout plans.
- Key plans showing elevation viewpoints.
- Bathroom wall elevations with finish specifications.
- Wall elevations for all rooms with finish specifications.
- Sections through all decorative details.
- Lighting layout.
- Switch layout.
- Outlet and power layout.
- Furniture tagging plans.
- Sketch design of custom cabinetry.
- Electrical equipment specification.
- Specifications for drywall and wood work, furniture and textiles, light fixtures, and switches and outlets.
Plus renderings: two or three views of each room.
How to Use the Drawings With Your Contractor
Give the contractor the full set before asking for a quote, so every bidder prices the same scope. Walk through the drawings together on site, mark any questions in writing, and agree that changes are recorded on the drawings rather than settled verbally. Keep one current version of the set on site, and make sure the specifications travel with the drawings, because quantities and materials are what drive the final cost.
Why the List Is Never Really "Fixed"
The list above is a genuine starting point, but the actual set of drawings a specific project needs depends heavily on two factors that have nothing to do with the design itself: the physical complexity of the space, and who is going to build it.
A project with simple, straight walls and standard room geometry can sometimes move forward with a leaner set than a project involving curved walls, complex ceiling geometry, or extensive custom millwork - the more unconventional the architecture, the more detail drawings and sections are needed to make sure the built result actually matches the design.
The construction crew matters just as much. When we work with our own established team, a leaner documentation set is often enough - years of working together mean fewer things need to be spelled out explicitly. When we work with a new team, or with a crew the client has hired independently, we deliberately push toward the fullest possible documentation package. The goal is straightforward: the more complete the drawing set, the fewer questions come up on site, and the fewer disputes arise later about what was actually specified.
What a Complete Set Looks Like
The minimum list is the floor, not the ceiling. We show what a full working drawing set looks like, using a real 68-sheet example, in our article what is included in an interior design project. In the US, any change to walls, plumbing, or electrical work usually also needs permit drawings; our architects prepare them to local codes, and drawings that require a local license are signed by licensed professionals we work with. See our floor plan redevelopment service.
Frequently Asked Questions
Why would the same project need more drawings with one crew than another? Documentation exists to remove ambiguity. An experienced team that has worked with us before can often fill in reasonable gaps correctly; a new team has no track record to draw on, so more has to be specified explicitly to prevent misinterpretation.
Does a smaller project need fewer drawings? Not necessarily in proportion to size - a small room with curved walls or custom joinery can require more detailed documentation than a much larger room with simple, standard geometry.
What happens if the drawing set is incomplete? Gaps in documentation get filled in on site, on the fly, by whoever happens to be there that day - which is exactly how avoidable disputes over cost, materials, and finished results tend to start.
Scoping the right level of documentation for a specific project and crew is exactly the kind of judgment our interior design and project support services are built around.
