Luxury home additions & extensions in Toronto & the GTA
If you’ve been searching home addition, home additions Toronto, house extension cost or home addition contractors near me and still don’t have a clear plan, you’re not alone. We help GTA homeowners turn those searches into a realistic scope, budget, and design for adding space instead of moving.
Who we work with
When does a home addition make more sense than moving?
Many clients arrive here after weeks of Googling things like “home addition,” “home additions Toronto,” “house extension,” “second storey addition” or “home addition cost.” This page is for you if any of the situations below sound familiar.
You love your neighbourhood but have outgrown your house and are exploring a home addition instead of moving.
You keep searching “rear home addition,” “add a room to house” or “house extension ideas” and want to know what’s actually possible on your lot.
You’re considering a bungalow addition or second storey addition and need help understanding structure, stairs and how the house will look once it’s complete.
You’re trying to compare home addition cost with buying a larger home and need a realistic range for the kind of addition you’re imagining.
You’ve spoken with a few home addition contractors and want a more design-led, carefully detailed approach that doesn’t leave the addition looking “tacked on.”
Our process
How we run a home addition from first visit to handover
A house addition touches structure, zoning, permits and how the entire home will feel once it’s done. Our role is to coordinate design, approvals, engineering and construction under one roof so you’re not stuck in the middle of multiple consultants and contractors.
1
Discovery, site review & zoning check
We start with how you live now, where the house feels tight and what kind of space you’re missing. On site, we review the existing structure and lot, then look at zoning, setbacks and height limits so we can talk honestly about what types of home additions are realistic.
1
Discovery, site review & zoning check
We start with how you live now, where the house feels tight and what kind of space you’re missing. On site, we review the existing structure and lot, then look at zoning, setbacks and height limits so we can talk honestly about what types of home additions are realistic.
1
Discovery, site review & zoning check
We start with how you live now, where the house feels tight and what kind of space you’re missing. On site, we review the existing structure and lot, then look at zoning, setbacks and height limits so we can talk honestly about what types of home additions are realistic.
2
Concept design & rough budget
Our design team develops concept options — for example a rear addition, side addition, second floor addition or bungalow addition — and pairs them with a rough home addition cost range.
2
Concept design & rough budget
Our design team develops concept options — for example a rear addition, side addition, second floor addition or bungalow addition — and pairs them with a rough home addition cost range.
2
Concept design & rough budget
Our design team develops concept options — for example a rear addition, side addition, second floor addition or bungalow addition — and pairs them with a rough home addition cost range.
3
Detailed design, engineering & selections
Once a direction is chosen, we refine floor plans, elevations and exterior massing, then coordinate with structural engineers as needed. Inside, we plan layouts for new spaces — such as kitchens, family rooms, bedrooms or bathrooms — along with finishes, windows and lighting.
3
Detailed design, engineering & selections
Once a direction is chosen, we refine floor plans, elevations and exterior massing, then coordinate with structural engineers as needed. Inside, we plan layouts for new spaces — such as kitchens, family rooms, bedrooms or bathrooms — along with finishes, windows and lighting.
3
Detailed design, engineering & selections
Once a direction is chosen, we refine floor plans, elevations and exterior massing, then coordinate with structural engineers as needed. Inside, we plan layouts for new spaces — such as kitchens, family rooms, bedrooms or bathrooms — along with finishes, windows and lighting.
4
Final estimate & phasing plan
We prepare a full estimate using our regular trades and suppliers, refine the scope with you and discuss whether the project will be completed in one phase or staged. Here we align your house addition cost expectations with the design and outline what’s included.
4
Final estimate & phasing plan
We prepare a full estimate using our regular trades and suppliers, refine the scope with you and discuss whether the project will be completed in one phase or staged. Here we align your house addition cost expectations with the design and outline what’s included.
4
Final estimate & phasing plan
We prepare a full estimate using our regular trades and suppliers, refine the scope with you and discuss whether the project will be completed in one phase or staged. Here we align your house addition cost expectations with the design and outline what’s included.
5
Permits, approvals & construction
We handle permit drawings and submissions, coordinate with city reviewers and manage scheduling once permits are issued. On site, our team oversees demolition, foundations, framing, roofing, building envelope, mechanicals, interior finishes and exterior tie-ins for the new addition.
5
Permits, approvals & construction
We handle permit drawings and submissions, coordinate with city reviewers and manage scheduling once permits are issued. On site, our team oversees demolition, foundations, framing, roofing, building envelope, mechanicals, interior finishes and exterior tie-ins for the new addition.
5
Permits, approvals & construction
We handle permit drawings and submissions, coordinate with city reviewers and manage scheduling once permits are issued. On site, our team oversees demolition, foundations, framing, roofing, building envelope, mechanicals, interior finishes and exterior tie-ins for the new addition.
6
Completion, walkthrough & aftercare
When construction is complete, we walk the addition and existing house with you, note any final touch-ups and make sure new and old spaces work together as intended. You’ll receive information about product warranties, engineering documents and our workmanship coverage.
6
Completion, walkthrough & aftercare
When construction is complete, we walk the addition and existing house with you, note any final touch-ups and make sure new and old spaces work together as intended. You’ll receive information about product warranties, engineering documents and our workmanship coverage.
6
Completion, walkthrough & aftercare
When construction is complete, we walk the addition and existing house with you, note any final touch-ups and make sure new and old spaces work together as intended. You’ll receive information about product warranties, engineering documents and our workmanship coverage.
Services included
More than extra square footage: what we actually do
A well-designed home addition is about more than adding square footage. It’s about proportion, light, flow and how the new space connects to the existing house and yard. Here’s how we approach home additions & extensions so they feel intentional, not tacked on.
Zoning, massing & siting
We look at what your lot and local zoning allow — rear, side or second storey additions — and study how an extension will affect light, privacy, setbacks and neighbouring homes before anything is finalised.
Zoning, massing & siting
We look at what your lot and local zoning allow — rear, side or second storey additions — and study how an extension will affect light, privacy, setbacks and neighbouring homes before anything is finalised.
Zoning, massing & siting
We look at what your lot and local zoning allow — rear, side or second storey additions — and study how an extension will affect light, privacy, setbacks and neighbouring homes before anything is finalised.
Structural design & integration
We plan how the new structure ties into the existing house, coordinating with structural engineers where required. That includes foundations, floor systems, roof lines and how loads are transferred, especially for bungalow additions and second-floor projects.
Structural design & integration
We plan how the new structure ties into the existing house, coordinating with structural engineers where required. That includes foundations, floor systems, roof lines and how loads are transferred, especially for bungalow additions and second-floor projects.
Structural design & integration
We plan how the new structure ties into the existing house, coordinating with structural engineers where required. That includes foundations, floor systems, roof lines and how loads are transferred, especially for bungalow additions and second-floor projects.
New layouts & room planning
We design the new interior spaces — kitchens, family rooms, bedrooms, bathrooms, entries or mudrooms — and how they connect back into the existing floor plan so the circulation feels natural, not forced.
New layouts & room planning
We design the new interior spaces — kitchens, family rooms, bedrooms, bathrooms, entries or mudrooms — and how they connect back into the existing floor plan so the circulation feels natural, not forced.
New layouts & room planning
We design the new interior spaces — kitchens, family rooms, bedrooms, bathrooms, entries or mudrooms — and how they connect back into the existing floor plan so the circulation feels natural, not forced.
Building envelope, windows & doors
We treat the exterior carefully: rooflines, wall assemblies, insulation, windows and doors are planned so the addition performs well and visually belongs with the original house, whether we match or intentionally update the look.
Building envelope, windows & doors
We treat the exterior carefully: rooflines, wall assemblies, insulation, windows and doors are planned so the addition performs well and visually belongs with the original house, whether we match or intentionally update the look.
Building envelope, windows & doors
We treat the exterior carefully: rooflines, wall assemblies, insulation, windows and doors are planned so the addition performs well and visually belongs with the original house, whether we match or intentionally update the look.
Why work with us
Why homeowners trust us with their home additions
A home addition is one of the most complex types of residential work — it affects structure, zoning, neighbours and how you live every day. Here’s why clients choose NADA instead of piecing together separate designers, engineers and home addition contractors.
Design–build under one roof
You work with one team for design, planning, engineering coordination and construction. That means fewer gaps between drawings and reality, and a clearer path from idea to finished house addition.
Design–build under one roof
You work with one team for design, planning, engineering coordination and construction. That means fewer gaps between drawings and reality, and a clearer path from idea to finished house addition.
Design–build under one roof
You work with one team for design, planning, engineering coordination and construction. That means fewer gaps between drawings and reality, and a clearer path from idea to finished house addition.
Clarity around home addition cost
Searches for “home addition cost”, “house extension cost” or “second storey addition cost” often return a wide range of numbers. We prefer to walk you through what moves the budget in your specific case — size, structure, finishes and complexity — and outline a realistic home addition cost range early.
Clarity around home addition cost
Searches for “home addition cost”, “house extension cost” or “second storey addition cost” often return a wide range of numbers. We prefer to walk you through what moves the budget in your specific case — size, structure, finishes and complexity — and outline a realistic home addition cost range early.
Clarity around home addition cost
Searches for “home addition cost”, “house extension cost” or “second storey addition cost” often return a wide range of numbers. We prefer to walk you through what moves the budget in your specific case — size, structure, finishes and complexity — and outline a realistic home addition cost range early.
Respect for existing homes & neighbourhoods
We’re careful about how additions affect existing houses and streetscapes in Toronto and the GTA West. Our goal is to design home extensions that improve both the property and how it fits into its context.
Respect for existing homes & neighbourhoods
We’re careful about how additions affect existing houses and streetscapes in Toronto and the GTA West. Our goal is to design home extensions that improve both the property and how it fits into its context.
Respect for existing homes & neighbourhoods
We’re careful about how additions affect existing houses and streetscapes in Toronto and the GTA West. Our goal is to design home extensions that improve both the property and how it fits into its context.
Managed construction and communication
We coordinate trades, inspections, structural work and finishing, keeping you informed throughout. You’re not left chasing answers from different home addition contractors and consultants at each stage.
Managed construction and communication
We coordinate trades, inspections, structural work and finishing, keeping you informed throughout. You’re not left chasing answers from different home addition contractors and consultants at each stage.
Managed construction and communication
We coordinate trades, inspections, structural work and finishing, keeping you informed throughout. You’re not left chasing answers from different home addition contractors and consultants at each stage.
Frequently Asked Questions
Questions we’re often asked about home additions
How much does a home addition cost in Toronto?
Costs vary widely depending on size, structure and finishes, but many home additions in Toronto and the GTA fall into broad ranges. During early conversations, we’ll discuss what you’re comfortable investing and outline a realistic home addition cost range based on similar projects.
What types of additions do you design and build?
We work on a range of house additions including rear extensions, side additions, bungalow additions, second storey additions and combinations of interior renovation with added space. We’ll help you understand which type makes sense for your home and lot.
Do I need an architect for a home addition?
For many projects, a design–build team like ours can handle both design and construction, coordinating with engineers where required. For more complex or architecturally driven additions, we can collaborate with your architect or recommend one. Either way, we’ll help you understand what your project needs.
How long does a home addition project usually take?
Timelines depend on design complexity, permitting and construction scope. A modest rear home addition is typically faster than a full second floor addition. Once your concept is defined, we’ll outline expected durations for design, permits and construction.
Can we live in the house during the addition?
Sometimes. For smaller or carefully phased home additions & extensions, it may be possible to stay in part of the house. For larger structural projects, moving out temporarily is often more comfortable and can help the work move faster. We’ll discuss options based on your specific project.
Why hire a home addition contractor instead of managing trades myself?
A house extension involves design, engineering, permits, inspections, foundation work, framing, mechanicals, interiors and exterior tie-ins. Working with a dedicated home addition contractor gives you one accountable team to manage all of those moving parts and reduce the risk of delays, oversights and rework.
How much does a home addition cost in Toronto?
Costs vary widely depending on size, structure and finishes, but many home additions in Toronto and the GTA fall into broad ranges. During early conversations, we’ll discuss what you’re comfortable investing and outline a realistic home addition cost range based on similar projects.
What types of additions do you design and build?
We work on a range of house additions including rear extensions, side additions, bungalow additions, second storey additions and combinations of interior renovation with added space. We’ll help you understand which type makes sense for your home and lot.
Do I need an architect for a home addition?
For many projects, a design–build team like ours can handle both design and construction, coordinating with engineers where required. For more complex or architecturally driven additions, we can collaborate with your architect or recommend one. Either way, we’ll help you understand what your project needs.
How long does a home addition project usually take?
Timelines depend on design complexity, permitting and construction scope. A modest rear home addition is typically faster than a full second floor addition. Once your concept is defined, we’ll outline expected durations for design, permits and construction.
Can we live in the house during the addition?
Sometimes. For smaller or carefully phased home additions & extensions, it may be possible to stay in part of the house. For larger structural projects, moving out temporarily is often more comfortable and can help the work move faster. We’ll discuss options based on your specific project.
Why hire a home addition contractor instead of managing trades myself?
A house extension involves design, engineering, permits, inspections, foundation work, framing, mechanicals, interiors and exterior tie-ins. Working with a dedicated home addition contractor gives you one accountable team to manage all of those moving parts and reduce the risk of delays, oversights and rework.
How much does a home addition cost in Toronto?
Costs vary widely depending on size, structure and finishes, but many home additions in Toronto and the GTA fall into broad ranges. During early conversations, we’ll discuss what you’re comfortable investing and outline a realistic home addition cost range based on similar projects.
What types of additions do you design and build?
We work on a range of house additions including rear extensions, side additions, bungalow additions, second storey additions and combinations of interior renovation with added space. We’ll help you understand which type makes sense for your home and lot.
Do I need an architect for a home addition?
For many projects, a design–build team like ours can handle both design and construction, coordinating with engineers where required. For more complex or architecturally driven additions, we can collaborate with your architect or recommend one. Either way, we’ll help you understand what your project needs.
How long does a home addition project usually take?
Timelines depend on design complexity, permitting and construction scope. A modest rear home addition is typically faster than a full second floor addition. Once your concept is defined, we’ll outline expected durations for design, permits and construction.
Can we live in the house during the addition?
Sometimes. For smaller or carefully phased home additions & extensions, it may be possible to stay in part of the house. For larger structural projects, moving out temporarily is often more comfortable and can help the work move faster. We’ll discuss options based on your specific project.
Why hire a home addition contractor instead of managing trades myself?
A house extension involves design, engineering, permits, inspections, foundation work, framing, mechanicals, interiors and exterior tie-ins. Working with a dedicated home addition contractor gives you one accountable team to manage all of those moving parts and reduce the risk of delays, oversights and rework.
Get in touch
Ready to plan your next renovation? Let’s talk.
We would be happy to discuss your home, condo, office, or restaurant renovation. Tell us about your project in the Oakville, Burlington, Mississauga, Toronto, or GTA West area, and our team will follow up to schedule a free, no-obligation consultation.
Have a project in mind?
Fill out the form and tell us a bit about your space. We’ll review your details and get back to you within 1 - 2 business days.
Book a free consultation
By submitting this form you agree that NADA Design & Build may contact you by email or phone to discuss your renovation project. Your information will only be used to respond to your enquiry and will not be shared or sold.
