1 888 670 9742

Home Additions

- What you need to know!

If you think your home is too small and you need additional rooms, opting for a home addition — instead of buying a new house — is often times the best way to go. Whether you're building on top or off of your existing home, your home addition project is not only the perfect opportunity to rethink your living space and increase the value of your home — it's also easier and less expensive than a move.

What is the cost of a home addition?

The price of a home addition can vary significantly, but in the following table you'll see the average market prices:

Type of House Addition Average Cost
Hardware and Labour
Addition of floor (unfinished) $100 to $125/ft²
Addition of floor (turnkey) $145 to $175/ft²
Addition on piers (unfinished) $110 to $125/ft²
Addition on piers (turnkey) $140 to $175/ft²
Addition on a slab foundation (unfinished) $125 to $170/ft²
Addition on a slab foundation (turnkey) $170 to $215/ft²
Solarium (4 seasons) (turnkey) $145 to $185/ft²
Addition of a garage (unfinished) $85 to $115/ft²
Addition of a garage (turnkey) $120 to $150/ft²
Addition of a room over an existing garage (turnkey) $145 to $175/ft²


Note that the cost of a home addition may vary by city, tending to be slightly higher in larger cities. For example, a home addition is usually more expensive in the cities of Toronto and Montreal than their suburbs.

To gain a better idea of the actual costs of a home addition, you can browse through real home additions projects with their end costs on the home addition section of Reno-Inspiration or speak with one of our renovation advisors who will be able to discuss your project with you and provide an estimate for the home addition you have in mind with no obligation.

Knafo Project - Home Addition

Building on or off of your existing home

Home additions come in many shapes and sizes — from finishing your basement and converting your sunroom to these major projects:

  • Adding a second story
  • Building a garage or an extension
  • Adding a rearward extension
  • Building a solarium or porch
  • Building a room above the garage
  • Transforming a single-family residence into a multi-generational home

Depending on the configuration of your home, the most commonly considered solutions are a foundation expansion, with or without a basement, a pile expansion, adding a garage, or building an additional floor. It should be noted that the addition of a floor requires a structure and foundation strong enough to accommodate the extra weight.

A home expansion is a great opportunity to rethink your living space and can, if done well, significantly increase the value of your home. It is also a project often more advantageous and less expensive than a move when you begin to calculate the costs and benefits. Improving and expanding on the home you love can prove to benefit your own standard of living whilst also being a financially wise investment.

Laferrière Project - Home Addition

Prepare for a well-planned home addition that pays for itself over time

Home additions are a big undertaking, but a well-planned home addition project will pay for itself day after day, year after year. Whatever your house addition project, you need to keep these two rules of thumb in mind:

Rule #1: With a major home addition project, no decisions should be made lightly or unexpectedly. Without a professional customized plan, you could seriously damage your home architecturally, structurally and aesthetically.

Rule #2: Relying on the expertise of a proven home addition expert, such as an architect and/or engineer, ensures the success of your home addition project.

Reno-Assistance can refer professional construction and renovation experts to you who can help…

  • Draft your plans, helping you identify what you want and what it will cost
  • Assess the technical feasibility of your project, choosing the right building material to ensure your new addition will be structurally sound
  • Analyze your environment to ensure building regulatory requirements are met
  • Implement your plan and specifications

With Reno-Assistance, you have instant access to professionals experienced in designing and building home additions. Depending on the nature of your addition, we can help you find the right general contractors, architects and structural engineers — whomever you need to get the job done right.

Carles Project - Home Addition

Planning for a home addition project

A home addition project can take many months of planning to obtain the permits and authorizations from your city (if required). An expansion project is very similar to a new construction and involves almost as many steps.

If you're thinking about managing every step of your home addition yourself, you may want to think about it twice. Some home addition projects can require up to 20 different professionals on the project whom you would need to schedule to your agenda and pay even during any delays that occur between different jobs which may require a contractor to work longer than expected. It's often wiser to let a professional General Contractor work full time on your project so you can continue your day-to-day with peace of mind.

Get up to three quotes and start making your dream project come true!

Demand only the best for your home addition and let one of our renovation advisors assist you with the crucial initial stages of your project. Trust Reno-Assistance to send you the contractors you need to get your job done on time and on budget. It’s free and there’s no obligation to work with the contractors we refer to you… but we think you’ll be more than satisfied with their workmanship and professionalism. To get started today, simply fill out the form to the right! Yes, it’s that easy!

Talk to a renovation advisor now! 1-888-670-9742

Let me help you with your home addition project

Omar Wahbi, Renovation Advisor

Or call me

1 888 670-9742
It's free and there's no obligation

Get your project started in 3 easy steps


Entrust us with your project

Your very own Renovation Advisor will be assigned to your project

Benefit from our experience on renovation projects.

Get up to 3 competing quotes

Your renovation at the right price

Your advisor will even help you compare and understand your quotations.

Choose the Perfect Contractor

All of our contractors have been Verified at 360°

Our team evaluates all contractors to a strict set of criteria.

It's free and there's no obligation!

Let me help you with your home addition project

Omar Wahbi, Renovation Advisor

Or call me

1 888 670-9742
It's free and there's no obligation

Our stamp of approval. A greater peace of mind.

With your renovation or construction project, it doesn’t pay to take chances with an unknown. Let Reno-Assistance refer you to one of our experts with our coveted 360° Verified Contractor stamp of approval — your peace of mind that our dedicated verification team has done a complete 360 of their credentials and track record. And you can take our word for it — literally. Everything we can share as we verify our 360° Verified Contractors is written in our 360° Verification Report, the only one of its kind in the industry. Bottom line? Only the best get our stamp of approval — and only the best get referred to you.

Browse through several projects overseen by Reno-Assistance to be inspired and get a fair idea of the price of the project you have in mind.

  • Real projects and inspirations
  • A price tag on each project
  • Save and share your favourites


Log In

    Create an account

      Forgot password