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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

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

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

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

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

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

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

3rd Floor Addition

Sheridan Ave

Toronto

This modern rear addition in Toronto is currently under construction. Cadaxx Design prepared the full design and permit drawings, transforming a compact urban lot into a bright, functional living space. The project features clean vertical lines, large rear windows, and efficient space planning. Once completed, it will add valuable square footage and a contemporary touch to this Toronto home

3rd storey addition project on Sheridan Avenue featuring a modern exterior upgrade, expanded living space, and refreshed architectural design — created and permitted by Cadaxx Design.

Completed 2026

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

Covered patio

Mika St

Innisfil

A custom covered patio designed to extend the home’s living space into the backyard. The open-gable roof and exposed beams create a spacious, attractive outdoor area for dining, relaxing, and entertaining while providing protection from sun and rain.

Covered patio design for Innisfil home

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

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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

2nd Floor Addition

Leland Ave

Etobicoke

This second-floor addition on Leland Ave creates a modern, expanded living space with clean architectural lines and improved interior functionality. The redesigned exterior introduces a fresh, contemporary look. Currently at the permit stage, the project supports growing family needs and long-term value.

Second floor addition project on Leland Avenue featuring an upgraded exterior, expanded living space, and refreshed architectural detailing — designed and permitted by Cadaxx Design.

Construction

2nd Floor Addition

Collinson

North York

This North York home is being transformed with a new second-floor addition and rear extension, creating additional living space while improving the overall layout and functionality of the existing home.


Traditional two-storey home design featuring a gabled roofline, light brick and siding, large windows, and a welcoming covered entrance.

Design

Front and Rear Addition

Betty Ann Dr

North York

This front and rear addition on Betty Ann Drive in North York is in the design stage. The layout is being expanded to improve function, flow, and natural light, with an upgraded exterior to enhance curb appeal and long-term value.


Front elevation of the proposed front and rear addition design on Betty Ann Drive in North York.

Design

2nd Floor Addition

Prince Charles

North York

This second-floor addition on Prince Charles expands the existing home with a fresh architectural expression and improved interior layout. Currently in design, the project introduces more functional bedroom space, updated curb appeal, and an upgraded structure tailored for future permit submission

Second floor addition project on Prince Charles Drive with updated exterior, expanded living space, and modernized design — currently in the design stage by Cadaxx Design.

Design

2nd Floor Addition

Stormont

North York

Contemporary traditional home addition on a corner lot in North York, featuring a new second floor, rear addition, and basement second unit. The design creates additional living space while giving the home a stronger street presence through balanced façades, modern detailing, and a grand front entrance.

Stormont Ave home addition under construction in North York.

construction

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