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Landscaping in Markham by Astonia Landscaping
GTA · Service Area

Landscape design & stone masonry in Markham.

Astonia Landscaping designs and builds high-end residential landscapes and natural-stone masonry in Markham. Owner-led by a third-generation stonemason, Astonia has been doing this work since 1975. Every Markham project is owner-led, built by our own WSIB-covered crews with our own equipment, and backed by $5 million in liability insurance.

  • Since 1975
  • 3 Generations
  • $5M Insured
  • WSIB Covered
  • Design-Build
In Markham

Landscaping that belongs in Markham.

Markham holds two very different kinds of property under one municipality, and a stone landscape has to answer to both. In Unionville and along the older heritage streets near Main Street, you have established homes on mature lots where the architecture and the streetscape already have a settled character — work here calls for restraint, natural stone that reads as if it has always been there, and detailing that respects the age of the house rather than competing with it. In the executive enclaves of Cachet and Angus Glen, the homes are larger and newer, the frontages more generous, and the expectation is a designed, cohesive landscape that matches the scale of the architecture. We design for the property in front of us, not a template.

Many of these are established executive homes on settled lots, which usually means mature trees, finished grading and existing hardscape that a new build never has to work around. Protecting healthy specimen trees, tying new stonework into established planting, and matching the grade and drainage already in place takes more planning and more care than a blank site — and it is exactly the kind of work that benefits from owning our own equipment and running our own crews, so there are no subcontractor delays and no guesswork on a property where mistakes are visible for decades.

Markham homeowners making a once-in-a-generation investment in their property tend to value the same things we do: craft that lasts, a clean and respectful site, and direct communication with the person responsible for the work. The owner is on your project and reachable every day. We run our own crews and leave the site clean and orderly each evening, because in a settled neighbourhood the condition of the site matters as much as the finished result.

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 delays.

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 Markham choose us.

Owner-led

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

Our own equipment

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

Built to last

Overbuilt foundations and natural stone, meant to hold their line for generations.

$5M insured

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

WSIB covered

A fully covered, professional crew on every project.

Design-build in-house

One team designs, builds and plants — no trades to chase.

Kind Words

Homeowners across the GTA, on the Astonia experience.

Five decades of referrals across the GTA & Durham. 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 Markham, 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 — and our crews are fully WSIB covered.

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.

Often, yes. We build alongside landscape designers, architects and major pool builders across the GTA, and we can also design and build the whole project in-house. Either way you deal with one accountable crew from the first site walk to the final planting.

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 Markham project starts here.

Book a free on-site consultation. We design, build and plant the whole space — one accountable crew from the first site walk to the last stone set.

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

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