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Permit guideOakvilleBuilding PermitsAdditions & Alterations

Addition, finished basement and interior alteration permits

A permit is required for an addition to an existing building, for finishing a basement to create rooms or living space, and for interior alterations.

From Oakville’s own pages, checked Oct 2026.

The municipality lists what to submit. CodeEase shows what the building code asks of it. See CodeEase →

  1. Check whether you need a permit

    A permit is required prior to building, renovating, demolishing or installing any of the following:

    • Addition to an existing building
    • Finishing a basement to create rooms or living space
    • Interior alterations
    Some work needs no permit

    A permit is not required before building, renovating, demolishing or installing any of the following:

    • Cabinetry or cupboards
    • Damp-proof a basement
    • Doors – replacing an existing one with the same size
    • Painting
    • Plumbing fixture replacement in the same location, for example a sink, tub, toilet, or shower
    • Windows – replacing an existing one with the same size
  2. Before preparing your permit

    • An addition is defined as adding to an existing building. If you plan an addition that requires substantial removal of the existing house, you will require a separate demolition permit.
    • If you plan to create a separate dwelling unit, please refer to the accessory apartment page.
    • Contact the Ontario Dig Authority 1-800-400-2255 before you dig to locate underground utilities and avoid damage during construction.
    • For electrical work, contact the Electrical Safety Authority (ESA) at 1-877-372-7233 or eas.cambridge@electricalsafety.on.ca
  3. Project preparation

    Detailed information is needed to properly evaluate your plans and the unique conditions of your property:

    • Before you get started, consult the zoning by-law to ensure your house plans, proposed dimensions and location are permitted under the Town of Oakville's zoning by-laws which regulate the use, shape and location of buildings on properties.
    • Visit our Zoning page or contact us at 905-845-6601 ext 3955.
    • If you plan to add additional plumbing fixtures you are required to submit a water service calculation form to verify your water service is adequately sized to handle the additional load or if upgrading is required.
    • If your addition adds a sixth or more bedroom, you will require a Building Code Part 6 ventilation design.
    • If your property is on the town's heritage registry it may require heritage approval.
    • contact a town Heritage Planner for assistance at 905-845-6601 ext. 3870 or 3875.
    • If your project includes excavation and your property backs onto green space, a river bed or wetland you will need Conservation Halton approval.
    • Contact Conservation Halton for approval at web@hrca.on.ca or 905-336-1158.
    • Trees on your property, your neighbour's property and on the municipal right of way may require tree protection, particularly when heavy equipment and excavation is involved. In certain instances, a permit may be required to remove private trees.
  4. Only if you plan to finish or renovate your basement for personal use

    Finished basement only

    If you plan to finish or renovate your basement for personal use, you will need a building permit.

    Plumbing

    • If you plan to add a bathroom, wet bar, or other plumbing fixture you are required to submit a water service calculation form to verify your water service is adequately sized to handle the additional load or if upgrading is required.

    Bedrooms

    • If you plan to add a basement bedroom, the basement requires an egress window or door.
    • Additionally, the bedroom requires its own window based on the floor area of the bedroom. If adding a sixth bedroom, you will require a Building Code Part 6 ventilation design.

    Heritage approval

    • If you are making changes to the building façade for windows or doors you will need heritage approval.

    Walk-up entrance

    • If you plan to add an egress door with walk up stairs, you will need to consult an engineer or BCIN qualified designer for construction drawings and details.

    Submission material checklist

    Prepare the following documents:

    • Site plan - required if adding or changing the size of openings like doors and windows, adding walk-up stairs, if applicable to your property or demolition
    • Elevations - required if adding or changing the size of openings like doors and windows, adding walk-up stairs, if applicable to your property or demolition
    • Floor plans
    • HVAC design (location of supply outlets and return inlets), Part 6 design - if applicable to your project
    • Engineered walk-up stair details - if applicable to your project
    • Sizing of water service pipe form
    • Schedule 1 designer information
    • Heritage Planning approval - if applicable to your property
    • Conservation approval - if applicable to your property
    • Tree protection declaration
  5. Only if you plan interior alterations: any change occurring inside the house that isn't decorative

    Interior alteration only

    Interior alterations are any change occurring inside the house that isn't decorative. This could include wall removals, adding new windows or enlarging existing ones, adding new or relocating plumbing fixtures.

    Walls

    • If you are removing a load bearing wall, you may require engineered beams and there may be changes to HVAC components.
    • If you are not sure if a wall is load bearing contact a BCIN qualified designer, architect or engineer.
    • For any permit that contains a load bearing wall removal provide complete framing plans for the whole house. Show all existing and proposed conditions, all point loads from above through to the foundation. Show any proposed changes to HVAC components. Where extensive interior renovations are proposed additional HVAC materials may be required.

    Walls: existing floor plan

    Existing floor plan for the floor level where the wall is being removed with a demolition plan and any temporary shoring (provide stamped shoring detail).

    • Indicate direction and span of existing floor joists.
    • Show existing beams and posts.
    • Show existing supply outlet and return air inlets location (including the grill opening size of the returns).
    • The integrity of the HVAC system shall be maintained at all times. All rooms or spaces affected by changes shall have adequate heat sources.

    Walls: proposed floor plan

    Proposed plan for the floor level where the wall is being removed.

    • Indicate direction and span of floor joists.
    • Show proposed beam locations, sizes, supports. Distance measured from the new beam to the next wall or beam that is supporting the floor joists (for each side of the beam).
    • Show changes to supply outlets and return air inlets (including the grill opening size of the returns) or provide a note indicating 'existing HVAC to remain', if no HVAC changes are proposed.
    • If ductwork is to be rerouted, existing and proposed configuration should be shown.

    Walls: floor levels above and below

    Plan views for all floor levels above and below where the wall is being removed.

    • Indicate direction and span of all floor joists.
    • Show all existing/proposed beams, their sizes and post locations. Distance measured from the beam to the next wall or beam that is supporting the floor joists (for each side of the beam).

    Windows and exterior doors

    • If you are making changes to the building façade for windows or doors you will need heritage approval.
    • Properties on the town's heritage registry require heritage approval.

    Submission materials

    Prepare the following documents:

    • Site plan - required if adding or changing the size of openings like doors and windows. Show all structures on the property and setbacks to property lines.
    • Elevations - required if adding or changing the size of openings like doors and windows. Ensure elevations are complete, dimensioned and labelled. If the area of above grade unprotected openings is being increased then provide OBC compliant spatial separation calculations.
    • Floor plans. Provide wall/ceiling assembly notes all floors. Provide lintel/header information for any new or altered openings. Provide OBC compliant glazing calculations where new room uses are indicated. Label all room uses. Show locations of supply and return airs throughout, and show the location of the furnace/water heater. Provide exhaust fans for all kitchen stoves and washrooms.
    • Cross sections wherever an unconditioned space is converted to a conditioned living space showing proposed assemblies.
    • Engineered beam details - if applicable to your project. See 'Walls' above for requirements for load bearing wall removals specifically.
    • Schedule 1 designer information
    • Heritage Planning approval - if applicable to your property
    • Water service sizing form
    • Ensure the integrity of the HVAC system is maintained at all times. Ensure all rooms with heat loss have adequate heat sources. Each floor level requires at least one return air inlet.
  6. Prepare your plans0 of 9

    Digital copies of drawings and documents are required, scaled to size and flattened. If preparing the documentation is beyond your comfort level or experience, we recommend working with a Building Code (BCIN) qualified designer, architect or engineer.

    You need an account to see these 9 items.It’s free. Use Sign in at the top of the page to create one, then tick the items off on any device and print them as a checklist.

  7. Complete the forms6

  8. Submit your application

    • Review and complete the Applicable Law Form to indicate which additional approvals may be required for your project. Save this form and be sure to upload it as a supporting document during the application process.
    • If it is your first time using our online services, you need to create a user name and password. If you have an existing account, you can use the same username and password.
    • Provide information about your project and upload your drawings and documents. You do not need to provide the Application for a Permit to Construct or Demolish.
    • Name your file using the short form name or a brief label so that the content of the document is clear.
    • Save files in Vector PDF format, unlocked/editable, greyscale, flattened into a single layer and free of comments.
    • The review and approval process of your submitted documents regarding your building permit application will be processed through the ePlan, powered by ProjectDox software, if your application requires drawings to be uploaded.
  9. Pay the fee

    • The total fees depend on the size, type and use of the proposed project or building. The exact cost of your permit will be calculated once we pre-screen your request.
    • The minimum fee for a building permit is $200.
    • You will be prompted to pay a $100 pre-screening fee when you submit your request online. This non-refundable deposit will be credited towards the total cost of your permit. Subsequent resubmissions are subject to the non-refundable pre-screen fee.
    • Building Services - Rates and Fees
    • There may be additional fees such as development charges or deposits you need to pay before your permit is issued.
    • Once your application is accepted, you will receive an invoice for payment.
    • Credit card up to $10,000 payable by signing into your town account
    • Email transfer up to $10,000 through your financial institution to buildingrequests@oakville.ca
    • Electronic funds transfer (EFT) in any amount with direct payment to the Town of Oakville's bank account.
    • Cheques are still accepted made payable to the Town of Oakville, and mailed or delivered to:
    • Town of Oakville Attn: Building Services 1225 Trafalgar Road Oakville, ON L6H 0H3

Written from Oakville’s own pages as published on 22 October 2026. The municipality decides what a permit needs: confirm with it before you apply. Legal notice

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