Architectural Drawings & Building Permits in London
London is a large, varied city, and building here can mean anything from a modern home in Byron or Lambeth to a careful renovation in Old North or Wortley Village. Homeowners and investors also want to take advantage of the demand for rental housing near Western University and Fanshawe College. Proventa Construction prepares architectural drawings in London, Ontario, along with complete permit drawings that meet the Ontario Building Code and the City of London’s zoning and review process.
The Thames River and its tributaries run through the city, and Upper Thames River Conservation Authority regulated areas affect a surprising number of properties. London also has several heritage conservation districts, including parts of Old North and Wortley Village, where exterior changes may need additional review. We check for these constraints early, which saves time and prevents your design from being sent back late in the process.
Custom Design & Spatial Planning
Home designs and additions that suit London’s range of lots, from older central neighbourhoods to newer subdivisions in the north and west.
Permit-Ready Drawing Packages
Site plans, structural framing, wall sections and energy documentation prepared for City of London Building Division review.
Additional Unit & Basement Suite Plans
Drawings for legal second units, duplex-style conversions and student-friendly rental layouts, with fire separation, egress and parking checked.
Zoning, Heritage & UTRCA Review
We review the zoning by-law, heritage status and conservation authority requirements before you commit to a design direction.
Specialized Architectural & Permit Services Across London
Architectural and permit services for London homeowners, landlords and developers.
Custom Homes & Infill Development
Complete drawing packages for new houses and infill projects across London.
Additions & Garage Plans
Second-storey, rear and side additions, plus garages designed around setbacks and lot coverage.
Legal Basement & Rental Units
Compliant drawings for rental suites, including those near campuses where demand is high.
Garden Suites & Accessory Dwellings
Plans for detached units where the lot and servicing can support them.
Heritage-Area Renovation Drawings
Careful design for homes in older districts where exterior changes are reviewed closely.
Minor Variance Support
Revised plans and documentation for Committee of Adjustment applications in London.
Why Partner with Proventa Construction in London?
Not sure what your project needs? Take a look at our permit drawings service to see what a complete submission package includes.
Frequently Asked Questions: London Building Permits
Key information about architectural planning, zoning reviews and building permits in London, ON.
Do I need a building permit in London, Ontario?
Usually yes, for new buildings, additions, structural changes, new second units and many decks. Accessory buildings under 10 square metres (about 107 sq. ft.) are generally exempt from a building permit, but zoning requirements still apply.
How long does a London building permit take?
The legislated review time for a house is around 10 business days from a complete application. Heritage review, conservation approval or incomplete drawings can add to this.
Can I build a rental unit in my London home?
In many cases, yes. Ontario rules allow additional residential units on many lots, but the unit still needs to meet Building Code and local zoning rules. We assess feasibility before preparing full drawings.
Does heritage designation affect my project?
It can. Homes in heritage conservation districts or individually designated properties may need extra approval for exterior changes. We check status at the start.
What if my property is near the Thames River?
Properties in regulated areas may require UTRCA approval before a building permit is issued. We identify this early and include it in the project plan.
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Verified Customer Reviews
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Our City-Wise Architectural & Permit Services
Proventa Construction provides comprehensive, end-to-end architectural drafting, structural design, and municipal permit clearance services across Ontario. We tailor each project to local zoning bylaws and Ontario Building Code standards to ensure seamless approvals and flawless project execution.
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