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Home Addition Permit 

Planning a second floor, rear, or side addition? Cadaxx Design delivers permit-ready drawings and coordinates everything needed to get your home addition permit in Toronto—from zoning review and Committee of Adjustment (CoA) to structural and HVAC engineering. We’ve guided homeowners across the GTA through City comments and approvals, minimizing delays and surprises. Whether you need extra bedrooms, a larger kitchen, or a full second storey, we design for code compliance, constructability, and budget. Start with a quick feasibility check: we’ll confirm setbacks, lot coverage, FSI, height, and parking before you invest in design.

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Zoning Review & Feasibility

We verify your lot’s zoning (RD/RS/RT, CR overlays), setbacks, lot coverage, FSI, height, platforms/decks, parking, and any TRCA/heritage constraints. You’ll get a clear “as‑of‑right vs variance” path before we design.

When You Need the Committee of Adjustment (CoA)

If your addition exceeds zoning by-laws, we prepare minor variance packages—plans, statistics, and a concise planning rationale—and represent you at CoA. We also handle neighbor outreach and refine drawings based on feedback and conditions.

Permit Drawings Package

Building  plans, elevations, sections, enlarged details, OBC matrix, statistics table, site plan, and typical construction notes. We coordinate structural (LVLs/steel, foundations) and HVAC (heat‑loss/ducting). Stamped engineering included where required.

Process & Timeline

Discovery call → 2) Zoning check & proposal → 3) Concept design → 4) CoA (if needed) → 5) Permit drawings & engineering → 6) City submission → 7) Revisions/approval → 8) Construction start. Typical permits: 4–10 weeks after submission (City queue dependent). CoA will add 3-4 month to this timeline 

Budget & What Affects It

Design/permit fees depend on size, variances, and engineering complexity. Construction costs vary by scope, finishes, and site access. We’ll price options early and suggest phasing if helpful.

Why Cadaxx

BCIN‑qualified design team, strong working relationships with municipal examiners, proven CoA strategies, and detailed, buildable drawings. We stay with you through permit comments until approval.

Get a Free Zoning Check

Send your address and a short brief.

We’ll reply with feasibility and next steps for your home addition permit in Toronto.

Rear Addition

Lonsmount Dr

Toronto

This Forest Hill project features a rear addition with upgraded basement walkout and open-concept main floor.

Cadaxx managed zoning review, Committee of Adjustment application, and full permit drawings with structural and HVAC coordination.

Rear addition project on Lonsmount Drive in Toronto with modern exterior, expanded living space, and updated façade — designed and permitted by Cadaxx Design.

Completed 2016

2nd Floor Addition

Manderley Dr

Scarborough

This second-floor addition on Manderley Dr expands the home with a modern façade and improved interior functionality. The new level introduces brighter living spaces, enhanced bedroom layout, and an updated street presence, creating a thoughtful upgrade now fully built.

Second floor addition project on Manderley Drive with modern updated exterior, expanded interior layout, and contemporary design — completed with permit drawings by Cadaxx Design.

Completed 2023

2nd Floor Addition

Rustic Rd

North York

This second-floor addition on Rustic Rd expands the original home with a balanced new façade and upgraded interior functionality. Now built, the project delivers additional living space, improved layout efficiency, and a modernized exterior that enhances both comfort and long-term property value

Second floor addition project on Rustic Road in North York featuring an updated exterior, expanded living space, and refreshed modern design — completed with permit drawings by Cadaxx Design.

Completed 2025

Second Unit Addition Over the Garage

Sidney Dr

Mississauga

This second apartment on Sidney Dr was designed as a private, fully functional secondary suite with modern finishes and efficient space planning. The layout provides bright living areas, improved functionality, and full compliance with zoning and permit requirements for multi-unit residential use.

Multi-unit building project on Sidney Drive in Mississauga featuring a clean white exterior, gable rooflines, and upgraded modern façade — designed and permitted by Cadaxx Design.

Completed 2023

2nd Floor Addition

Haig Blvd

Mississauga

This second-floor addition on Haig Blvd expands the existing home with a modern exterior and improved interior layout. The new upper level introduces brighter bedrooms, enhanced circulation, and refreshed curb appeal, creating valuable additional living space tailored for growing family needs

Second floor addition project on Haig Boulevard in Mississauga featuring an updated modern exterior, expanded living space, and refreshed architectural façade — designed and permitted by Cadaxx Design.

Completed 2024

Side Addition

Varsity Rd

Toronto

This side addition in the Varsity area enhances entry flow, provides new storage space, and improves interior functionality. The project included zoning review, permit drawings, and structural layout for new foundation and framing, achieving balanced exterior proportions and increased daylight throughout the home.”

Side addition project on Varsity Road in Toronto featuring a refreshed exterior, expanded layout, and updated architectural design — completed with permit drawings by Cadaxx Design.

Completed 2020

Side Addition

River Rd

Mississauga

This project transformed an aging 1½-storey home on River Road into a two-storey residence with expanded living space, improved structure, and a completely redesigned exterior. Cadaxx Design provided full architectural drawings, zoning compliance, permit submissions, and construction-phase support.


Completed side-addition project on River Road in Mississauga featuring a modern two-storey home with updated façade, garage, and new exterior finishes.

Completed 2022

Second Unit Addition Over the Garage

Deanhome Rd

Mississauga

This Deanhome Road project in Mississauga features a well-integrated second-unit addition over the existing garage, designed to increase living space while maintaining the home’s original character. Careful attention was given to proportions, rooflines, and exterior compatibility to ensure a cohesive result from design through permit approval.

Proposed addition over garage at Deanhome Road Mississauga

Completed 2021

2nd Floor Addition

Botfield Ave

Etobicoke

This second-floor addition on Botfield Ave introduces modern space expansion with a balanced exterior design. The layout enhances upper-level functionality while maintaining the original home’s character. Currently in construction, the project provides valuable extra living space tailored to the homeowners’ needs.

House addition project on Botfield Avenue in Etobicoke featuring a modernized exterior, expanded living space, and refined architectural upgrades — designed and permitted by Cadaxx Design.

Construction

3rd Floor Addition

Grandview St

East York

This full home renovation on Grandview Ave includes a third-storey addition with complete architectural drawings, zoning review, and permit coordination. Cadaxx managed every stage of the process, ensuring OBC compliance and creating a modern, expanded layout now advancing through the construction phase.

Home addition project on Grandview Street showcasing an expanded footprint, upgraded façade, and modern architectural improvements — designed and permitted by Cadaxx Design.

Construction

2nd Floor Addition

Shady Lawn Ct

Mississauga

This Shady Lawn project in Mississauga involves a well-integrated second-floor addition designed to enhance living space and curb appeal. The design introduces new gable rooflines, improved proportions, and a cohesive exterior aesthetic. Currently under construction, the project prioritizes functionality, natural light, and long-term comfort.

Shady Lawn second-floor addition in Mississauga showing updated rooflines and front elevation design, currently under construction.

Construction

2nd Floor Addition

Springmount Ave

This second-floor addition on Springmount Ave is now in construction, blending modern design with a functional layout. The project enhances the existing home with added space, natural light, and updated curb appeal, using warm contemporary materials to create a refined final look.


Second floor addition project on Springmount Avenue with an updated exterior, expanded living area, and modern architectural upgrades — designed and permitted by Cadaxx Design.

Construction

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