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Landscaping in Oakville by Astonia Landscaping
GTA · Service Area

Landscape design & stone masonry in Oakville.

Astonia Landscaping designs and builds high-end residential landscapes and natural-stone masonry for homeowners in Oakville. Owner James Dennison is a third-generation stonemason, and the firm has worked across the GTA and Durham Region since 1975. Every project is owner-led, with daily communication from the first consultation through the last stone set in place.

  • Since 1975
  • 3 Generations
  • $5M Insured
  • WSIB Covered
  • Unilock Authorized
In Oakville

Landscaping that belongs in Oakville.

Oakville rewards patience. Many of its finest properties sit on generous, mature lots in Old Oakville and along the lakeshore, where established gardens, decades-old trees, and stone walls already give the land its character. Building well here means working with what is already there rather than clearing it away. We design around the trees worth keeping, match new masonry to the weight and tone the street already carries, and treat the existing garden as a starting point, not an obstacle. The result should look like it has always belonged.

Homeowners in this part of Halton tend to be design-led, and they have usually lived with their property long enough to know exactly what is missing. They notice how a stone wall is coursed, how a step meets a path, how a terrace sits against the house. That kind of attention is the reason we work the way we do. As a third-generation stonemason, James handles the natural-stone work and the design intent personally, and because Astonia owns its own equipment and hauls every bit of debris away in its own trucks, the property stays calm and orderly through a build that may run many months.

The lakeside setting brings real site considerations. Lots closer to the shore deal with grade changes, drainage, and mature root systems that all have to be read carefully before anything is built, and established neighbourhoods often mean tight access and close neighbours who would rather not see a bin sitting at the curb for a season. Astonia is fully WSIB-covered and carries $5M in liability insurance, and as a Unilock Authorized Contractor we hold our hardscape work to a standard meant to last in this climate. The aim on every Oakville property is craft that settles into the place and looks better with age.

How it works

From first handshake to final reveal.

01

Initial Consultation

We meet you on-site to walk the space, understand how you want to live in it, and talk through your vision and investment — no obligation.

02

Design & 3D Review

Our designer measures and plans your space, then renders it in 3D so you can see it before we break ground. We refine every detail together.

03

Breaking Ground

Our own crews and equipment start at 7:00 AM, keep the site clean every day, and brief you each morning and evening — no subcontractor gaps, no bins.

04

Project Completion

After a final walkthrough, the only thing left behind is your finished space — built to gather on for generations.

The Astonia difference

Why homeowners in Oakville choose us.

Owner-led

Daily communication from James, from the first handshake to the final reveal.

Our own equipment

Small and heavy machines, run by our own crews — no subcontractor delays.

No unsightly bins

We haul every bit of debris away in our own trucks, every day.

$5M insured

Liability coverage above the industry average, for your peace of mind.

WSIB covered

A fully covered, professional crew on every project.

Unilock Authorized

Warranty-grade materials and professional installation standards.

Kind Words

Homeowners across the GTA, on the Astonia experience.

Five decades of referrals across the GTA & Durham — and a Unilock Authorized Contractor. Read more on Google & Houzz.

"Working with James was great from the beginning. He put my mind at ease with his product knowledge and his creative designs."

AmandaToronto · Verified

"The natural stone work and landscape job that James and his crew did is beautiful, outstanding work. The quality is outstanding — we would recommend this company to anyone."

Mike & AntoinetteBrampton · Verified

"Astonia was a delight from start to finish. The crew showed up early and worked long days to finish on time. We are now enjoying the most amazing front yard. Outstanding results!"

JonusesToronto · Verified

"As a repeat client, we selected Astonia to transform our simple backyard into a relaxing space amongst a natural setting that will bring us many years of pleasure."

DavidMississauga · Verified
Good to know

Landscaping in Oakville, answered.

We design and build across the GTA & Durham region — including Toronto, Etobicoke, Mississauga, Brampton, Oakville, Vaughan, Markham, Newmarket, Aurora, King City, Whitby, Oshawa, Bowmanville and the surrounding areas.

Every project is different — from focused stonework to a full landscape transformation — so we provide a clear, detailed proposal after an on-site consultation rather than a generic price. Most of our work is a meaningful, lasting investment in your property.

Timelines depend on scope, and you receive a realistic one at the design-review stage before we break ground. Because we own our equipment and run our own crews, we work efficiently — starting at 7:00 AM and keeping the site clean every day.

Yes. We carry $5 million in liability insurance — above the industry average — our crews are fully WSIB covered, and we are a Unilock Authorized Contractor.

Yes. Our designer visits your home to measure and plan the space, then renders your project in 3D so you can see it before any work begins. We review and refine it together until it is right.

No unsightly bins on your driveway — we haul everything away in our own trucks and leave a tidy site every day.

Astonia is led by James Dennison, a third-generation stonemason with five decades of craft. You get the expertise of a large company with the warmth and accountability of a family business, owner-led from start to finish.

Nearby

We also build in your neighbours' yards.

Your Oakville project starts here.

Book a free on-site consultation. We design, build and plant the whole space — then haul it all away when the last stone is set.

$5M insured · WSIB-covered crews · 3rd-generation craftsmanship since 1975

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