Harmony Basements

Basement Renovation Toronto

Looking for basement renovation in Toronto? Harmony Basements offers complete design-to-finish basement solutions with 20+ years of experience.

Book an in-home Design & Price

Basement Renovation Services Mississauga

Expect The Absolute Best

Diego Botia, (B.Arch) Architect & Designer

Families Trust Harmony

4.9/5

Homestars Best Basement Experts Since 2014

Voted Top Basement Renovator

All Real Reviews

Work with a True Professional

While others push for a quick deal, we focus on designing a spectacular basement for your family – with the most comprehensive presentation in the GTA.

Talk to a Designer, Not a Sales Rep

BASEMENT RENOVATION BY HARMONY BASEMENTS

We invite you to immerse yourself in the harmonious world of the best basement renovation and finishing experts in Toronto & the GTA. Don’t take our word for it – view our portfolio and read our reviews to experience the Harmony world. Contact us if you have any questions or would like a FREE, no-obligation estimate.

Harmony basement team gettting homestar awards

#1 Basement Finishing & Renovation Contractors

Harmony Basements is a leading basement contractor in Toronto, serving homeowners across Toronto and the GTA. We take pride in being innovators in the basement renovation and finishing industry. With over 20 years of experience in basements, we know all the trade secrets.

We ensure that we have our customers’ stamp of approval in every project we take on. At Harmony Basements, we always provide the highest-quality service with our professional attitude and commitment. Moreover, our team of experts uses top-of-the-line tools, technologies, and materials to ensure the utmost perfection in our work.

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Redefining Basement Renovations

Renovating a basement is more than construction and design. It takes innovation and creativity. Harmony Basements specializes in merging fine detail with exquisite design and structural integrity to achieve stellar results. We use advanced technology to create elaborate virtual tours that allow our clients to see exactly how their new basement will look when it’s complete.

Most contractors are focused on getting the job done as quickly and simply as possible. In their attempt to maximize their profit margins, they often cut corners and shortchange homeowners. Not us. Harmony Basements takes a customer-focused approach to renovation projects and offer comprehensive solutions that keep homeowners at the center.

Our Services

Our Basement Designing Process

We start by using advanced technology to create elaborate virtual tours that allow our clients to see exactly how their new basement will look when it’s finished. This not only helps them visualize the end result, but also allows them to make informed decisions about the design and layout of their new space.

Once we have a clear understanding of our client’s vision, we work diligently to offer a variety of design options based on their preferences. We don’t believe in a one-size-fits-all approach, so we take the time to listen and understand our client’s needs.

Our Process

Our Vision

At Harmony Basements, we believe that a basement should be more than just a storage space or a place to do laundry. It should be an extension of your home and a reflection of your personal style. We’re passionate about helping our clients transform their unfinished or outdated basements into beautiful, functional, and inviting spaces that they can enjoy for years to come.

We’re also committed to quality and integrity in everything we do. We don’t cut corners or use subpar materials to save money. Instead, we only use the highest quality materials and employ skilled craftsmen who take pride in their workmanship. This ensures that every project we complete is not only beautiful but also built to last.

We believe in the transformative power of a well-designed and well-built basement. We’re passionate about helping our clients achieve their vision and creating spaces that they’ll love for years to come.

About Us

Harmony Basement:Basement Renovation Toronto

Harmony Basements

Our innovation knows no bounds. We’ve created systems to streamline our processes and curate client-centered solutions. We don’t believe in a one-size-fits-all approach. Instead, we take the time to work closely with our clients to fully understand their vision for their new basement. Then, we work diligently to offer a variety of design options based on their preferences.

From preliminary procedures to post-construction, the Harmony Basements team is there every step of the way, ensuring that no detail is left behind.

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Our Basement Renovation Process

01 Get a free estimate!

The first step in finishing your basement is to contact us. You will be greeted by a client service advisor and we will give you a free at-home estimate.

02 In-home consultation

The main purpose of this consultation is to completely understand your needs for this new space, by asking the right questions, listening, and proposing smart and creative ideas.

03 Our Proposal

Our work proposal includes a 3D render design that will help you visualize how your dream basement will look. It will also include an itemized breakdown of the cost of the project.

04 Finance your project

We understand that costs can be a major barrier in getting your dream basement. For that reason, we offer flexible financing options with dedicated financial advisors who will provide approval on loans to our valued clients and to help them make a confident decision.

05 Visit our Design Centre

At this stage of the process, our design consultant will walk you through our showroom to help you choose the finishes and materials for your new basement.

06 Building Permits & Scheduling

We handle all permit drawings and applications for our clients, included in every project at no cost – that’s our promise. We encourage every homeowner to do it right, with permits and inspections, never cutting corners. Once drawings and specifications are complete, your project manager will provide a detailed schedule so you know exactly what to expect.

07 Material Delivery

After the dates have been set, the materials will be delivered. We take pride in keeping the construction space as clean and as mess-free as possible.

08 Installation Begins

With the materials on hand to start working on your dream basement, our team of excellent craftsmen will begin the installation process.

09 Quality Inspection

Our quality control coordinator will inspect the installation process from start to finish, guaranteeing a perfect job every time.

10 Client Satisfaction

At this stage, we have the opportunity to ensure client satisfaction and foster a lasting relationship.

11 Warranty

Once the basement renovation is complete, we provide our valued clients with lifetime basement renovation warranty documents.

See why families across Ontario continue to choose Harmony Basements year after year, since 2014

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Real Reviews

That speak louder than words

My wife and I set out to find a contractor to completely gut and transform our basement into a fully functional suite for our daughter, her boyfriend, his 4-year-old son, and their soon-to-arrive baby.Our requirements were strict: we needed a family room, a kitchen, a 3-piece bathroom, and three bedrooms. Given the limited square footage and the unusual foundation layout of our basement, we knew this would be a major challenge. We needed someone highly creative, experienced, and willing to think outside the box.Most of the contractors we met came in, took basic measurements with tape or a laser, briefly listened to our needs, and quickly quoted us. Almost all of them said that fitting a 3-piece bath and a family room was possible, but having three bedrooms as well was “virtually impossible.” That was until we met Diego from Harmony Basements.From the moment Diego walked in, it felt different. He carefully listened to everything we wanted, then proceeded to take detailed measurements of every part of the basement. That very same night, he sat down and designed a scaled layout complete with a virtual 3D walkthrough that showed us exactly what we had envisioned and more. Diego is an absolute wizard at maximizing every square inch of space. He spent over three hours with us that evening.Then came the question all homeowners dread: “When can you start, and how long will it take?” Without hesitation, Diego confidently said he could start within the week and finish in four to six weeks. He explained that he had dedicated teams for every trade and that a project manager would be assigned to oversee the entire build.When Diego left, my wife and I just looked at each other in disbelief. It felt too good to be true.But Diego kept his word. Within days, we received a clear, detailed, and structured work schedule. Honestly, after receiving such a “Rolls-Royce” level of service in our first meeting, we braced ourselves for a shocking price. To our surprise and relief, the cost was well within our budget.One thing worth noting: Harmony Basements was the only company that included key finishes: bathroom vanity, toilet, plumbing fixtures, kitchen cabinets, sink, and faucet... all in the base quote. Other contractors excluded these or listed them as upgrades.After signing, we were invited to their showroom to select paint colors, kitchen cabinet styles, bathroom tiles, plumbing fixtures, trim details, and more. It felt like designing a brand-new home.Throughout the project, we made a few changes to the layout. Diego and our assigned project manager, Roy, handled all of them without hesitation. In fact, Diego made some excellent suggestions that we happily adopted, such as relocating the entire furnace and ducts to improve the layout. Communication was consistent, and the entire team was professional, respectful, and clearly passionate about their work.Diego, Roy, and the talented crew completed everything exactly on schedule, no delays and no excuses.The finished result is nothing short of spectacular. We’re still amazed at how they managed to turn our challenging basement into a beautiful, spacious, and practical suite with a cozy family room, a large bathroom, and three bedrooms with proper closets. The attention to detail and craftsmanship truly stand out.The process was smooth and stress-free. The team worked diligently, five to six days a week, allowing our daughter and her family to move in earlier than expected.It’s also worth mentioning that Diego doesn’t just do basements. He handles full home renovations of all kinds.. and after this experience, we wouldn’t trust anyone else.If you're looking for a one-stop shop with a professional, trustworthy contractor who delivers exceptional results at a fair price, look no further. Choose Diego and Harmony Basements.. you’ll be glad you did!

James Johnson

14:02 07 Oct 25

My wife and I set out to find a contractor to completely gut and transform our basement into a fully functional suite for our daughter, her boyfriend, his 4-year-old son, and their soon-to-arrive baby.Our requirements were strict—we needed a family room, a kitchen, a 3-piece bathroom, and three bedrooms. Given the limited square footage and our basement's unusual foundation layout, we knew this would be a major challenge. We needed someone highly creative, experienced, and willing to think outside the box.Most of the contractors we met came in, took basic measurements with tape or a laser, briefly listened to our needs, and quickly quoted us. Almost all of them said that fitting a 3-piece bath and a family room was possible, but having three bedrooms as well? "Virtually impossible"—until we met Diego from **Harmony Basements**.From the moment Diego walked in, it was different. He carefully listened to everything we wanted, then proceeded to take detailed measurements of every part of the basement. That very same night, he sat down and designed a scaled layout complete with a virtual 3D walkthrough that showed us exactly what we had envisioned—and more. Diego is an absolute wizard at maximizing every square inch of space. He spent over three hours with us that evening!Then came the question all homeowners dread: *"When can you start, and how long will it take?"* Without hesitation, Diego confidently said he could start within the week and finish in 4–6 weeks. He explained that he had dedicated teams for every trade and that a project manager would be assigned to oversee the entire build.When Diego left, my wife and I just looked at each other in disbelief—this felt too good to be true.But Diego kept his word. Within days, we received a clear, detailed, and structured work schedule. Honestly, after receiving such a “Rolls-Royce” level of service in our first meeting, we braced ourselves for a shocking price. To our surprise and relief, the cost was well within our budget.One thing worth noting: **Harmony Basements was the only company** that included key finishes—bathroom vanity, toilet, plumbing fixtures, kitchen cabinets, sink, and faucet—all in the base quote. Other contractors excluded these or listed them as upgrades.After signing, we were invited to their showroom to select paint colors, kitchen cabinet styles, bathroom tiles, plumbing fixtures, trim details, and more. It felt like designing a brand-new home!Throughout the project, we made a few changes to the layout. Diego and our assigned project manager Roy handled all of them without hesitation. In fact, Diego made some excellent suggestions that we happily adopted, like relocating the entire furnace and ducts to improve the layout. Communication was consistent, and the entire team was professional, respectful, and clearly passionate about their work.Diego, Roy, and the talented crew completed everything exactly on schedule—no delays, no excuses.The finished result is nothing short of spectacular. We’re still amazed at how they managed to turn our challenging basement into a beautiful, spacious, and practical suite with a cozy family room, a large bathroom, and three bedrooms with proper closets. The attention to detail and craftsmanship really stand out.The process was smooth and stress-free. The team worked diligently—5 to 6 days a week—allowing our daughter and her family to move in earlier than expected.It’s also worth mentioning: **Diego doesn’t just do basements**. He handles full home renovations of all kinds—and after this experience, we wouldn’t trust anyone else.If you're looking for a one-stop shop with a professional, trustworthy contractor who delivers exceptional results at a fair price, **look no further**—**choose Diego and Harmony Basements**. You’ll be glad you did!Check out the attached pictures starting from the initial basement through demolition to completion!

James Johnson

21:41 02 Sep 25

This is the second basement project completed with Harmony Basements and we are thrilled with the results. Diego and his team were professional, courteous, friendly and consulted us through the project. Workmanship and details were excellent. Diego helped us navigate through some material supply shortages, common these days, to deliver a top notch design that was on time and budget! Looking forward to enjoying our basement for many years to come. Thanks again!

Dan M

18:18 01 Sep 25

Three words to summarize Harmony Basements: fantastic and highly recommended.We had been considering finishing our basement for some time and spoke with a few contractors, with Harmony being one of them. From the very first meeting with Diego, we felt confident. He came to our unfinished basement, listened to our ideas, and surprised us by quickly preparing a detailed architectural 3D rendering walkthrough of what the finished space could look like, along with a clear price and timeline.Once we moved forward, everything fell into place seamlessly. The process was very organized and the communication was always clear. Diego’s project manager, Roy, took over once construction started, and the team worked efficiently and professionally. Diego had promised the work would be done in six weeks, and they actually finished two days ahead of schedule.I didn’t have any referral or recommendation for Harmony, but I trusted my gut after meeting Diego, and I’m very glad I did. This team truly delivered beyond expectations.If you are looking for a contractor who respects timelines, produces excellent results, and runs projects with professionalism, I highly recommend Harmony Basements.

Rajni Radja

00:48 25 Aug 25

From the moment I sat down with Diego , I knew that he was passionate about what he does and that my basement Reno was in good hands.He has surrounded himself with an impeccable team and the work they do is something that will truly amaze you .Where other companies were requiring that i take care of the permits, Diego put my fears at ease and handled it all , so that I wouldn’t have to.From moving ducts around so that I may have a cleaner ceiling look to extending my accent wall so that the tv does not cover it all, Diego really makes sure that you will be completely satisfied with the finished product.We couldn’t be happier with how our basement came out.A huge Thank You to Diego and the entire Harmony Basements Family for making this project so easy on us and for having us grin from ear to ear with the finished product.

Demetrios B

10:30 07 Aug 25

In 2024, they renovated our 2,000 sq. ft. space into a beautiful suite with a bedroom, walk-in closet, full bath, studio/gym, large storage, living-dining area, laundry, and direct garage access—all within six weeks, as promised.From the start, architect-owner Diego impressed us. He spent hours designing our layout, offered smart advice on function and budget, and delivered a 3D design that fit our lifestyle. His attention to detail—from switch placements to structural integrity—shows his professionalism and experience.A special thank you Roy, the site manager! He far exceeded our expectations; pleasant, knowledgeable, respectful, experienced, and structurally sound. He was very patient with our questions about minor details such as heights of towel rods and mirror! Roy went out of his way to personally make the project successful! Our confidence in Harmony was 100% enhanced by Roy's almost daily presence and his long hours to meet the timeline.Thanks as well to:- Arturo for precise framing and perfect bulkheads and drywalling- Jimmy for high-quality painting—even on weekends- Sasha for her reliable daily coordination- Stephany, our designer, for her current and patient design choicesThe entire crew was respectful, timely, tidy, and efficient. They cleaned up daily, and even hired professional cleaners for the final day—something other companies don’t provide.Diego runs Harmony with honesty, transparency, and no surprises or extras. He even followed up personally on a kitchen cabinet issue within 24 hours. We never once had to chase them after payment, and he stayed just as helpful after the project ended.I’m 110% satisfied with the results of this project. From the design build to the handing over, we were totally happy we picked Harmony for the excellent quality of their work. We will definitely rehire them in the future for any renovation needs.

Katherine Gan

20:59 29 Jun 25

Harmony Basements understands what it means to exceed expectations. We asked them to come and quote us for completely finishing our basement that included a wet bar, 3 piece bath, and podcast studio. Other contractors that we asked for quotes provided one after a 30 minute inspection of the house.Diego spent approximately 3 hours working on the quote at our home, which resulted in a 3D walkthrough and 3 different layout options of what the finished product would look like. His attention to detail, and work put into the quote, as well as his willingness to be flexible on price gave us the confidence to go with him and his team.Add to that, that we had a very tight timeline of exactly 6 weeks, his team of specialized contractors put in the extra hours and weekends to ensure that the project was completed with time to SPARE which served to help us immensely in getting our studio ready for broadcast.There were issues with getting the permit and later some electrical issues, which Diego and his team addressed promptly without having to chase them which was very refreshing to see.In the end, we are 100% satisfied with the result of the build. From design, to the friendliness of his people, to the quality and speed of the work, you would be missing out if you did NOT use Harmony Basements for your needs.They are truly in a class all on their own.

Ryan Davies

13:44 05 Jun 25

We loved working with Diego, Roy and everyone from Harmony Basements. From our initial meeting with Diego it was clear who we were going to choose for our basement renovation. Several times I thought we may have encountered something that would stretch our initial timeline, but if longer days were required then that’s what happened to keep it on time. Always available, clear communication and planning, good people. You won’t be disappointed choosing Harmony for your project.

Taylor Brown

12:30 05 Jun 25

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DIEGO BOTIA

Architectural Creative Director
(B.Arch) Architect – (A.A.S) CAD Designer

Diego will never settle for anything less than perfection. He thoroughly studied the art and science of architecture and graduated with honours at a very young age. Diego and his team of professionals devote their heart and soul into every basement renovation project. This is why thousands of homeowners in Ontario have trusted him to build their dream basement. His unrivalled pursuit of perfection in every aspect of the design and build process has helped him establish an award-winning home improvement experience.

Book Your Private Showroom Visit with a True Basement & Construction Expert

Experience curated finishes, real 3D designs, and expert guidance

Diego Botia Founder & CEO of
Harmony Basements
Nancy Peterson Founder & Former
CEO of HomeStars

Harmony’s Dream Decor Studio

We’re Celebrating a 100% client satisfaction rating

True Architecture in Every Detail
True architecture is where beauty and function dance in perfect harmony. That’s the principle I bring to every Harmony basement. I personally walk every site, guide every rough-in, and approve every final detail — because perfection is personal.
Diego Botia

Start My Design Journey

The Harmony Difference

What You Deserve

What Others Deliver

Talk directly with an architect (not a sales rep)	Pushy, commission-based sales reps
Fixed, transparent pricing – no hidden fees	Surprise add-ons & shifting costs
Architect-led design & permit process (free drawings + permits)	Skip permits unless forced by homeowner
Custom AutoCAD design including electrical, HVAC & plumbing	Basic floor sketches or template designs
Realistic 3D walkthroughs with advanced software	Sales-first, design-later approach
Private showroom with curated selections	Limited catalog-based selections
Focused on quality over quantity	Lowest-bid trades, rushed workmanship
In-house finishing team & trusted licensed trades	Subcontracted crews with inconsistent quality
Guaranteed timeline with on-time delivery	Vague timelines, frequent delays
Lifetime warranty — personally backed by the founder	Limited or unclear warranty — no personal accountability

Experience the Difference

August-Only Exclusive Upgrade Event

While Others Cut Corners,
We Raise Standards

Quality Over Gimmicks

We don’t play the “lowest quote” game, we deliver superior value from day one.

Transparent, Itemized Pricing

No guesswork or hidden fees—see exactly what each line costs and why it’s there.

Free Building Permit

To protect your investment, we handle all architectural drawings, submission, & inspections – at no extra cost.

3D Architectural Design + Virtual Reality Tour

Test-drive your basement design with a realistic 3D walk-through. Powered by technology brought straight to your home.

Book before August 31st and every premium upgraded feature below is automatically included.

Premium Upgrades – Now Standard

Upgrade:	What you get:
Subfloor System	Low-profile, mould-resistant, fully waterproof. Built-in airflow & insulation.
GRANDEUR® Luxury Vinyl Plank	Choose 33 flood-proof colours – Integrated underlay blocks mould & mildew.
100 % Matching Vinyl Stair Capping	Seamless look from floor to steps—no fragile hardwood stain guessing games.
Waterproof, Mould-Free Envelope	Engineered system that protects your investment from the ground up.

High-Quality Finishes aren’t Extras – They’re Our Baseline.

I WANT THE ABSOLUTE BEST

Watch basements go from blueprint to “wow.”

Follow @harmonybasements.ca on Instagram for live project updates, 3-D previews, and real client reactions.

What happens when a design looks good on paper, bu

We recently completed a full basement finishing pr

We’re appreciative of this thoughtful review by

We love how this basement finishing in East Gwilli

This Milton homeowner wasn’t happy with the poor

Custom bar, sleek finishes, and cozy vibes - all d

Luxury Finished Basement

Use the Interactive 3D Virtual Tour and feel as real as being in the basement!

Click PLAY & Walk around with your mouse or touch screen

As Seen On

Premium Design Experience

Maximizing our customers’ return on investment by designing harmonious basements.

Click to Play & Enjoy the 3D-Model Video

Our Services & Expertise

**Unlock the Full Potential of Your Basement**
*Explore Service*

Finance Your Basement Renovation Project in GTA

No Interest for 12 Months
Low Interest Rates
Completely Open to Pay Out Anytime
No Payments for 3, 6, or 12 Months

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Approx: $500/Month

Open Entertainment Room
(Personal)

Approx: $750/Month

Multi-Functional Basement
(Family)

Approx: $1,000/Month

Basement Apartment
(Legal Second Suite)

Approx: $850/Month

Basement Gym
(Wellness)

A Great Basement Renovation Begins With A Great Design

Are You Ready To Be WOWED?