SD&G Contracting
Natural stone walkway, steps and garden beds in front of a home in Cornwall, Ontario

Interlock & Hardscaping in Cornwall, Ontario

Patios, driveways, walkways and retaining walls built on a base that survives Cornwall winters.

Call (613) 363-9166

Free on-site estimate · Written fixed-price quote · Response within 1 business day.

500+ projects · 9+ years in Cornwall · Free on-site estimate

Tell us about your patio or driveway, no phone number until the last step

Free estimateQuestion 1 of 5
Interlock & Patios

Is this for a home or a commercial property?

What we build

Pavers, stone and walls for Cornwall properties

Interlock paver patio and pool deck installed in Cornwall, Ontario

Interlock Patios

Paver patios sized to how you actually use the yard: dining, seating, a clear path to the door. Laid on a compacted granular base with edge restraint so the pattern stays tight instead of creeping outward after a few Cornwall winters.

Custom paver walkway with garden bed edging in Cornwall, Ontario

Custom Paver Walkway

Custom paver walkways designed around your layout, from the driveway to the front door or out to the patio. Set on a compacted granular base with clean border cuts and edge restraint, so the lines stay crisp and the surface stays even for years.

Paver walkway and front entrance with garden bed edging

Walkways & Front Entrances

The first thing anyone sees. Front walks, landings and steps built to a comfortable rise and run, with the paver cuts kept clean at the borders and around the porch.

Long grey armour stone retaining wall with black fencing in SD&G

Retaining Walls

Segmental block and armour stone walls built with a compacted footing, clear stone backfill, geotextile and a drain line. Water behind a wall is what pushes it over, so drainage is designed in before the first course goes down.

Natural stone steps and landing in a Cornwall garden

Natural Stone Steps & Landings

Solid slab granite and armour stone steps set on compacted stone, levelled individually. No hollow risers, no rocking treads after the first spring thaw.

Paver patio seating area with raised stone garden bed in Cornwall, Ontario

Fire Pits & Outdoor Living

Built-in fire pits, seat walls, pillars and lighting sleeves run while the base is open, so nothing has to be cut back into finished stone later.

Paver brands we install in Cornwall & SD&G

We install the premium paver, slab and wall systems shown below. We help you choose based on look, budget and how each option holds up to Eastern Ontario freeze-thaw, but the brand matters less than the compacted base underneath it.

Techo-Bloc

Textured, natural-stone looks for high-end patios, steps and outdoor living.

Unilock

A long-standing Ontario manufacturer with a wide range of pavers and retaining wall systems.

Rinox

Modern, clean-lined slabs and wall units popular across Eastern Ontario and Quebec.

Mcon

Well-built, budget-friendly pavers and walls for driveways and larger areas.

Not sure which fits your project? We'll bring samples to your free on-site estimate.

Not sure which surface suits the space? We'll walk it with you.

Call (613) 363-9166

The part nobody shows you

Why most interlock fails in Eastern Ontario

Every paver patio looks good the day it is finished. The difference shows up in year two, and all of it is buried under the stone.

Frost depth and freeze-thaw

Cornwall frost drives roughly four feet down. Water trapped in the base freezes, expands about nine percent, and lifts whatever sits on top. Come spring it drains away and the surface drops, rarely back to where it started. Do that thirty times a winter and a shallow patio becomes a rollercoaster. You do not beat frost, you give the water somewhere to go.

The granular base depth that actually matters

Base depth is the single number that separates a ten-year patio from a three-year one. We install 6–8" of compacted granular under patios and walkways, and 10–12" under driveways where vehicles load the surface. Anything laid on 3" of stone and a lot of sand will look identical on handover day and nothing alike in year two.

Geotextile separation

Most of SD&G sits on clay. Without a woven fabric between the subgrade and the base stone, the stone slowly migrates down into the clay and the clay pumps up into the stone. The base thins out from below where nobody can see it. The fabric costs very little and keeps the base a base.

Every quote we write specifies the base depth. Ask the other guys for theirs in writing.

Recent project · start to finish

Patio, steps & wall: here's what's under ours

Every interlock job looks good on the last day. These photos show the days before it, from bare dirt to finished patio.

  1. 1. Dig out

    Old soil and grass dug out between the house and garage, down to firm ground and graded to carry water away from both buildings.

    Yard between a house and garage dug out for a new interlock patioExcavated ground beside the house foundation, ready for a stone base
  2. 2. Build the base

    Compacted stone base, drainage pipe and geogrid reinforcement, with the first course of wall block set level. This is the part you never see, and the reason it stays flat.

    Compacted clear stone base with plate compactor, drain pipe and first course of retaining wall blockGeogrid reinforcement laid over the compacted stone base behind the wall block
  3. 3. Lay the pavers

    Large-format slabs laid tight and in pattern, with a border band and clean cuts along the house and garage.

    SD&G crew member laying large-format interlock slabs on the prepared baseInterlock patio laid out with a contrasting border band
  4. 4. Steps, wall & finish

    Steps up to the garage door, a capped retaining wall, joints filled and fresh topsoil graded in around the edges.

    Finished interlock patio with steps up to the garage door and a capped retaining wallFinished interlock landing and steps with retaining wall and new topsoil

Recent project · design to finish

Pool deck makeover

From a tired, heaving pool deck to a new interlock yard with a new fence around the whole perimeter, designed in 3D before a single paver came up.

  1. 1. Before

    Worn, heaving red pavers around the pool, rotting timber edging and an overgrown side path along the fence.

    Old red interlock pool deck with heaved pavers and timber edging before the makeoverOvergrown side path with rotting timber planter beside the old pool deck
  2. 2. Design & tear-out

    We drew the new yard in 3D first so the owners could see it before we started. Then the old pavers and edging came out.

    3D design rendering of the new pool deck, walkway and garden bedOld pavers stacked after being lifted from around the pool
  3. 3. Base & pavers

    The whole yard rebuilt on a compacted stone base, then new pavers, steps and a contrasting border band laid over it.

    Compacted stone base spread across the yard around the poolSD&G crew laying new pavers with a dark border band and steps along the fence
  4. 4. Finished

    A clean new pool deck and walkway, a new wood fence around the whole perimeter of the yard, and a low wall and garden bed along the fence with border band trim throughout.

    Finished interlock pool deck around an in-ground poolFinished interlock walkway with border band and low wall along the fence

Hiring the wrong contractor costs more than hiring the right one.

A redo on interlock costs more than doing it right the first time. Here is the difference.

What usually goes wrong

  • Heaving and settling after the first winter, because the base was too shallow and never compacted in lifts
  • A quote that grows once the excavator starts and the real site conditions show up
  • A wrecked lawn from equipment access, left for you to repair
  • Joints wash out in year two and nobody answers the phone about warranty

How we work on interlock

  • Base depth specified in writing: 6–8" under patios, 10–12" under driveways, compacted in 3" lifts
  • Fixed-price written quote after we walk the site, including excavation and disposal of the old surface
  • Our own excavators and access mats, and we restore the access route as part of the job
  • Polymeric sand, edge restraint and a written workmanship warranty you can hold us to

What you get in writing

  • Workmanship warranty in writing
  • Free on-site estimate, no obligation, response within 1 business day

Interlock questions we get every week

Building further out in the county? Call (613) 363-9166.

Get your interlock quote, base depth included

Free on-site estimate · Written fixed-price quote · Response within 1 business day.

Free estimateQuestion 1 of 5
Interlock & Patios

Is this for a home or a commercial property?

Rather just talk it through?

Driveways, retaining walls and anything with a grade problem: call Tristan directly.

Mon–Fri 8am–6pm · Within 1 business day

Call (613) 363-9166