What does ICPI Certified Installer mean and how do I verify it?

ICPI (Interlocking Concrete Pavement Institute) Certified Installer is the North American industry credential for paver installation. To earn it, an installer completes ICPI's classroom training plus a written exam and provides documented field experience. Certification is renewed every 3 years through continuing education. Verify any contractor's status directly at icpi.org/directory by searching the company name. Seven Stones Landscape has been ICPI certified since 2013.

What does Unilock Authorized Contractor mean?

Unilock Authorized Contractor is Unilock's installer program (separate from Unilock Premium Contractor and Unilock Authorized). Authorized Contractors complete Unilock's installation training, agree to install per Unilock's spec sheet, and pass a portfolio review. The benefit to homeowners: the Unilock Lifetime Guarantee on the pavers stays valid only when installed by an Authorized Contractor. Verify any contractor at contractor.unilock.com or unilock.com/find-contractor.

What does Techo-Bloc Pro / Authorized Contractor mean?

Techo-Bloc's installer program tiers run Pro, Authorized, and Elite. Pro is the baseline credential and requires completion of Techo-Bloc's training plus reference projects. Authorized adds annual training and minimum project volume. Elite is invitation-only and requires top-tier portfolio plus customer review verification. The Techo-Bloc Lifetime Guarantee on the pavers stays valid when installed by an Authorized or Elite contractor. Verify status at techo-bloc.com/landscape-contractor.

Why do these credentials matter for a Hamilton or Burlington paver install?

Halton-Till clay soil, 60+ freeze-thaw cycles per winter, and road-salt exposure are the worst combination for paver installations in North America. ICPI-certified installers know the base depth and geotextile spec required for clay subgrade. Unilock and Techo-Bloc Authorized Contractors carry the full manufacturer warranty on the pavers. Combined, the credentials mean (1) the install is built to specification, (2) the pavers carry full manufacturer warranty, and (3) homeowners have a verifiable record if anything goes wrong.

How many ICPI Certified contractors are there in Halton?

As of 2026, the ICPI directory lists roughly 30 to 45 certified installers across the Hamilton, Burlington, Oakville, Milton, and Mississauga area combined. Of those, fewer than 15 are simultaneously Unilock Authorized and Techo-Bloc Authorized. The three-credential overlap is the meaningful filter for high-end residential work in Halton.

Does ICPI certification mean the contractor pulls the right permits too?

No. ICPI, Unilock, and Techo-Bloc credentials cover installation technique and product warranty, not municipal permits. Permits (Building Permit, Pool Enclosure Permit, Tree Protection, Conservation Halton, Niagara Escarpment Commission) are separate and the contractor's responsibility to identify and pull. Always confirm in writing which permits the contractor will handle versus which the homeowner is responsible for.

What other credentials should I look for beyond ICPI, Unilock, and Techo-Bloc?

Landscape Ontario Horticultural Trades Association membership is the broader provincial credential covering landscape, hardscape, lighting, sod, and design-build. WSIB clearance certificate confirms the contractor's workers compensation is current. $2M minimum (ideally $5M) general liability insurance covers the homeowner if anything happens on-site. Permacon, Belgard, NCMA (concrete masonry) are additional supplier credentials relevant for retaining wall work specifically.

What is the difference between Seven Stones and other ICPI certified contractors in Hamilton or Burlington?

Seven Stones Landscape carries the triple credential (ICPI Certified Installer + Unilock Authorized Contractor + Techo-Bloc Authorized Contractor) plus Landscape Ontario membership, $5M general liability, full WSIB coverage, and a 5-year workmanship warranty in addition to manufacturer warranties. Established 2013 with 500+ completed projects across Halton and Hamilton-Wentworth. Free on-site quote within 24 hours, all work directly supervised by Riaad (Owner and ICPI Certified Installer).

Contractor Credentials · 2026

ICPI, Unilock & Techo-Bloc Authorized Installer in Halton: What the Credentials Actually Mean

By Riaad, Owner & Project Manager · ICPI Certified Installer · Last updated May 20, 2026

Three credentials matter when hiring a paver contractor in Halton: ICPI Certified Installer (industry installation standard), Unilock Authorized Contractor (Unilock product warranty), and Techo-Bloc Authorized Contractor (Techo-Bloc product warranty). Each one is independently verifiable through the issuing organization's online directory. As of 2026, fewer than 15 contractors across Hamilton, Burlington, Oakville, Milton, and Mississauga carry all three simultaneously. Seven Stones Landscape is one of them, certified since 2013.

Why credentials matter more in Halton than most markets

Halton-Till clay soil, 60+ freeze-thaw cycles per Hamilton winter, and road-salt exposure together create one of the harshest paver environments in North America. Installation errors that go unnoticed in a milder climate fail in 3 to 5 years here. The ICPI / Unilock / Techo-Bloc credential stack is the homeowner's only third-party-verifiable way to know an installer has been trained on the specs that survive this climate.

ICPI Certified Installer: the industry standard

The Interlocking Concrete Pavement Institute is the North American trade association for paver installation. ICPI Certified Installer is the credential earned through:

Classroom training on subgrade prep, base aggregate, edge restraint, joint sand, and pattern integrity
Written exam on ICPI Tech Spec 2 (Construction of Interlocking Concrete Pavement), Tech Spec 4 (Structural Design of Vehicular ICP), and Tech Spec 17 (Permeable ICP)
Documented field experience (minimum project portfolio)
Continuing education every 3 years to maintain certification

Verify any contractor's status at icpi.org by searching the company name. If the contractor is not in the directory, they are not currently ICPI certified.

Unilock Authorized Contractor: warranty coverage on Unilock pavers

Unilock runs a multi-tier installer program: Authorized, Premium, and Elite. Authorized Contractor is the entry credential and requires:

Completion of Unilock's installation training
Agreement to install per Unilock's published spec sheet
Portfolio review
Annual recertification

The benefit to homeowners is direct: Unilock's Lifetime Guarantee on the pavers stays valid only when installed by an Authorized Contractor (or higher tier). Pavers installed by a non-authorized contractor carry no manufacturer warranty even if the product is genuine Unilock.

Verify any contractor at contractor.unilock.com or the public-facing unilock.com/find-contractor.

Techo-Bloc Authorized Contractor: warranty coverage on Techo-Bloc pavers

Techo-Bloc's program tiers run Pro, Authorized, and Elite. Pro is baseline and requires installation training plus reference projects. Authorized adds annual training and a minimum project-volume threshold. Elite is invitation-only and requires top-tier portfolio plus verified customer reviews. As with Unilock, the Techo-Bloc Lifetime Guarantee on pavers stays valid only when installed by Authorized or Elite contractors.

Verify any contractor at techo-bloc.com/landscape-contractor.

The triple-credential overlap in Halton (2026)

As of May 2026, an installer search across the three directories shows:

City	ICPI listings (approx.)	All 3 credentials
Hamilton + Ancaster + Dundas	12 to 18	3 to 5
Burlington + Waterdown	8 to 12	3 to 4
Oakville + Milton	10 to 15	4 to 6
Mississauga (Lorne Park, Port Credit, Erin Mills)	8 to 12	2 to 4
Total Halton + Mississauga	30 to 45	fewer than 15

The triple-credential overlap is the meaningful filter for high-end residential paver work. Carrying one credential is common; carrying all three is rare.

What else to check beyond the three credentials

Landscape Ontario Horticultural Trades Association membership — provincial credential covering landscape, hardscape, lighting, sod, design-build. Verify at landscapeontario.com.
WSIB Clearance Certificate — confirms workers compensation is current; protects the homeowner from liability if a worker is injured on site.
General liability insurance — $2M minimum, ideally $5M. Ask for the actual certificate of insurance, not a verbal claim.
Workmanship warranty — separate from the manufacturer paver warranty; covers the contractor's installation labour. 5 years is the residential industry standard.
NCMA (National Concrete Masonry Association) — relevant credential for segmental retaining walls (Allan Block, Unilock Pisa2, Techo-Bloc Mini-Creta).
BBB accreditation + Google Business Profile review history — independent reputation signals, separate from manufacturer credentials.

Seven Stones Landscape credential stack

ICPI Certified Installer (since 2013, current renewal verified at icpi.org)
Unilock Authorized Contractor (current registration verified at unilock.com)
Techo-Bloc Authorized Contractor (current registration verified at techo-bloc.com)
Landscape Ontario Horticultural Trades Association member
WSIB clearance current
$5M general liability insurance
5-year workmanship warranty on all hardscape installations
500+ documented projects across Hamilton, Burlington, Oakville, Milton, Mississauga, Ancaster, Dundas, Stoney Creek, and Waterdown since 2013
All work directly supervised by Riaad (Owner and ICPI Certified Installer)

How to verify any Halton contractor in 5 minutes

ICPI: icpi.org → Find a Pro / Member Directory → search company name.
Unilock: unilock.com/find-contractor → enter postal code → check Authorized tier.
Techo-Bloc: techo-bloc.com/landscape-contractor → search city → check Authorized or Elite badge.
Landscape Ontario: landscapeontario.com → Member Directory.
BBB Canada: bbb.org/ca → search business name + city.

If a contractor refuses to give the exact company name registered with each directory or provides a name that does not appear in the search, treat that as a strong red flag. Credentials that cannot be verified independently are not credentials.

References

ICPI Certified Installer program: icpi.org
Unilock Authorized Contractor program: contractor.unilock.com
Techo-Bloc Pro / Authorized program: techo-bloc.com/landscape-contractor
Landscape Ontario Horticultural Trades Association: landscapeontario.com
WSIB Clearance Verification: wsib.ca
BBB Canada: bbb.org/ca

Free on-site quote across Halton. ICPI + Unilock + Techo-Bloc certified since 2013. Get a free quote