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

Landscape design & stone masonry in Whitby.
Whitby is one of the closest towns to our Hampton base, and we have worked across Durham long enough to know its streets well. From the heritage homes near the downtown core to the estate properties and acreage around Brooklin, we bring fifty years of natural-stone craft and owner-led landscape design to homeowners here — the same crews, the same equipment, and James involved from the first walk of the property to the last stone set.
- Since 1975
- 3 Generations
- $5M Insured
- WSIB Covered
- Unilock Authorized
Landscaping that belongs in Whitby.
Whitby spans a wide range of property types, and the right approach changes with each one. The older neighbourhoods around the historic core hold century brick homes on generous lots with mature trees — settings where heavy machinery has to be worked in carefully and new stonework needs to sit comfortably beside what is already there. Because we own our equipment and haul all debris away in our own trucks, we can move through an established street without tearing it up or leaving a bin parked on the driveway for weeks.
North of town, Brooklin has grown into a mix of established village streets and newer executive estate properties, with true acreage and rural lots on the edges where Whitby meets the countryside. These are the larger canvases we are built for — full design-build work where a stone patio, retaining walls, planting and water can be planned as one landscape rather than added piecemeal. On the bigger parcels, grade and sightlines matter as much as the stone itself, and that is the kind of planning we do at the design-review stage, before anything is dug.
Homeowners in Whitby tend to be making a once-in-a-generation investment in a property they intend to keep, and they care about how the work is done as much as the result. The soils shift as you move north toward the moraine, drainage and frost depth have to be respected, and mature trees are worth protecting rather than working around carelessly. We treat all of that as part of the job — a clear proposal after we see the site, daily communication while we are there, and a finished landscape built to outlast us.
From first handshake to final reveal.
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.
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.
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.
Project Completion
After a final walkthrough, the only thing left behind is your finished space — built to gather on for generations.
Why homeowners in Whitby 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.
"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."
"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!"
"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."
Landscaping in Whitby, 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.
Your Whitby 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




