Floor Plan Drawings: Guide to Residential Permit Plans
📐 Quick Answer
Floor plan drawings are scaled, overhead views of a building’s interior — showing room layouts, wall positions, door and window locations, dimensions, and the use of each space. They are required for every floor level affected by a building permit application. In Ottawa, floor plans must be fully dimensioned, drawn to scale (typically 1:50), and show both existing conditions and proposed changes so that Building Code Services can verify your project meets the Ontario Building Code and local zoning regulations.
Floor plans are the core of every residential building permit application. They are the drawings that show exactly how the inside of your home is laid out — and exactly how it will change after your renovation, addition, or new construction is complete. Without accurate, code-compliant floor plan drawings, your permit application will be sent back with deficiency notices.
At Architectural Drawing, we specialize in house architectural drawings for residential building permits across Ottawa. This guide explains what floor plans must include, how they fit into the complete drawing package, and what the City expects to see before issuing a permit.
What Are Floor Plan Drawings?
Floor plan drawings are horizontal cross-sections taken through a building at roughly window height (about 1.2 metres above each floor level). They reveal the layout of rooms, corridors, and spaces as if you removed the top half of the building and looked straight down. Every building permit set includes floor plans because they communicate the most essential information: how spaces are organized, where walls and openings are located, and how the building functions.
Floor plans are part of a larger set of house architectural drawings that also includes site plans, elevations, cross-sections, and construction details. Together, these drawings form the complete picture the City needs to review your project.
What Ottawa Requires on Residential Floor Plans
Ottawa Building Code Services requires floor plan drawings for each floor level that is being constructed or affected by the proposed work. For additions, floor plans of all or part of the existing building may also be required. Refer to the City of Ottawa’s drawing requirements page for the official checklist. Here is what each floor plan must include:
If your project involves pre-engineered floor joist systems (such as I-joists or floor trusses), a manufacturer’s joist layout plan must also be included in the submission. For projects involving load-bearing wall removals, the floor plan must indicate the location and size of the replacement beam and posts.
The Complete Permit Drawing Package
Floor plan drawings are one component of the full set of house architectural drawings required for a building permit. Here is how all the pieces fit together:
📍 Site Plan
Bird’s-eye view of the lot showing building footprint, property lines, setbacks, and grading. Full guide →
🏠 Floor Plans
Interior layout for each level — rooms, walls, doors, windows, fixtures, and dimensions. This guide covers floor plans.
🏗️ Elevations
Exterior views (front, rear, sides) showing building height, roof pitch, window positions, and cladding
✂️ Cross-Sections
Vertical cut-throughs showing foundation, wall construction, ceiling heights, floor-to-floor dimensions, and roof assembly
🔧 Details & Notes
Construction specifics: wall assemblies, insulation values, window schedules, structural connections, and OBC compliance notes
Not every project requires all of these. A simple interior renovation may only need existing and proposed floor plans plus a key plan showing the building’s location. A new custom home requires the full set. To see what’s needed for your specific project, review our renovation permit guide.
Floor Plans Required by Project Type
For all projects that alter existing construction, both existing and proposed floor plan drawings are required. This lets the plans examiner see what is changing. If you do not have the original drawings for your home, as-built drawings must first be prepared from on-site measurements.
Need Floor Plans for an Ottawa Building Permit?
We prepare complete, permit-ready floor plans and full drawing packages — from measurement to City submission.
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Common Floor Plan Mistakes That Delay Permits
Incomplete or inaccurate floor plan drawings are one of the most common reasons Ottawa building permits receive deficiency notices. Here are the mistakes we see most often:
Missing dimensions — every room, corridor, and opening must be dimensioned. Overall building dimensions and individual room measurements are both needed.
Rooms not labelled — every space must be identified by use. The Building Code has different requirements for bedrooms, kitchens, bathrooms, and utility rooms.
No existing plan provided — for renovations, only submitting the proposed plan without showing the existing layout makes it impossible for examiners to understand what is changing.
Egress windows missing — every bedroom (especially in basements) must show a window that meets minimum OBC egress size requirements. This is the #1 basement permit issue.
Fire separations not shown — for secondary dwelling units, semi-detached homes, and townhomes, fire-rated walls and ceilings must be clearly indicated with the required rating.
Not drawn to scale — all plans must use a conventional architectural scale (1:50 is standard for floor plans). Freehand sketches or proportionally incorrect drawings are rejected.
Every deficiency requires a correction and resubmission, adding days or weeks to your permit timeline. Professional house architectural drawings prepared by an experienced designer avoid these issues from the start.
Who Can Prepare Floor Plans for a Building Permit?
In Ontario, the person who takes design responsibility for house architectural drawings depends on the building type and project complexity:
For a detailed comparison, see our guide on architects vs architectural technologists. For pricing information, visit our drawing costs guide. To understand the full permit drawing process, including how we coordinate with engineers, view our process page.
How Much Do Floor Plan Drawings Cost?
Floor plans are almost always prepared as part of a complete permit drawing package rather than as a standalone service. Here are typical cost ranges for Ottawa residential projects:
These costs include the floor plans, site plan, elevations, sections, and details — the complete package needed for a building permit submission. Explore our renovation drawing services or custom home design services for more details. For a detailed cost breakdown, visit our pricing guide. For permit fee information, see our 2026 Ottawa building permit fees page.
Frequently Asked Questions
What is the difference between a floor plan and a site plan?
A floor plan shows the interior layout of one level of a building — rooms, walls, doors, windows, and dimensions. A site plan shows the building’s position on the property — its footprint, setbacks to lot lines, driveways, and grading. The floor plan is used to verify Ontario Building Code compliance, while the site plan verifies zoning compliance. Both are required for most building permits.
Can I draw my own floor plans for a building permit in Ottawa?
Yes, under Ontario’s homeowner exemption, you can prepare your own drawings for work on a home you own. However, the floor plans must be fully dimensioned, drawn to a conventional scale, and include all the information listed above. If the project involves structural changes, a licensed Professional Engineer must still prepare and stamp the structural drawings. Most homeowners find professional drawings reduce deficiency notices and speed up the approval process.
What scale should floor plans be drawn at?
The standard scale for residential floor plans is 1:50 (metric), which means 1 centimetre on the drawing equals 50 centimetres in real life. For smaller projects or detailed areas, 1:20 may be used. For larger homes that need to fit on a single sheet, 1:100 is sometimes acceptable. The City requires all drawings at a conventional architectural scale — arbitrary scales are not accepted.
Do I need existing floor plans if I am building a new home?
No. For new construction on a vacant lot, only the proposed floor plans are required. However, if you are demolishing an existing home and rebuilding, the City may require documentation of the existing structure for the demolition permit application.
Do floor plans need to show electrical and plumbing?
Floor plans must show plumbing fixture locations (sinks, toilets, tubs, showers, floor drains) and mechanical equipment locations (furnace, water heater, electrical panel). Full electrical plans showing outlet and switch locations are generally not required for the building permit — electrical work is permitted separately through the Electrical Safety Authority (ESA). Plumbing rough-in drawings may be required for new plumbing or significant plumbing relocations.
What is the difference between floor plan drawings and architectural blueprints?
The term “blueprints” is an older name for construction drawings that refers to the blue-and-white copies produced by a now-obsolete printing process. Today, floor plans and other permit drawings are produced digitally using CAD software and delivered as PDF files. The terms are used interchangeably in casual conversation, but modern house architectural drawings are far more detailed and precise than traditional blueprints.
How long does it take to prepare floor plan drawings?
A simple interior renovation drawing package (existing + proposed floor plans with details) can be prepared in 1 to 2 weeks. More complex projects like additions or new homes typically take 3 to 6 weeks for the full design and drawing process, including client reviews and revisions. Expedited turnaround is available for time-sensitive projects.
What is a BCIN and why does it matter for floor plans?
BCIN stands for Building Code Identification Number. It is issued by the Ontario government to designers who have passed examinations in specific Building Code categories (such as house design, HVAC, or plumbing). When a BCIN designer signs the Schedule 1 form on a building permit application, they take legal responsibility for the design. This is the qualification most commonly used for residential floor plan drawings and permit packages in Ottawa.
Can I use floor plans from a home plan book or online template?
Stock floor plans from plan books or online sources can serve as a starting point for design ideas, but they cannot be submitted directly for an Ottawa building permit. Permit drawings must be customized to your specific lot (showing accurate setbacks and zoning compliance), meet current Ontario Building Code requirements, and be signed by a qualified designer. Generic plans also cannot account for local conditions like soil type, grading, or heritage district restrictions.
What happens after my floor plans are approved?
Once the City approves your drawings and issues the building permit, you (or your contractor) must build according to the approved plans. The approved drawings must be kept on-site and available for the building inspector at all mandatory inspection stages. If changes are needed during construction, a permit revision must be submitted before the work can proceed.
Ready for Professional Floor Plans?
Ottawa’s trusted team for accurate, permit-ready house architectural drawings — from initial measurement to City approval.
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