Built to spec
Built to your engineered drawings, survey, and the real site conditions, not a standard package forced to fit.
Underground Stormwater Systems are buried detention and infiltration systems that store and manage runoff beneath a site. Harrowgate Group self-performs the work to your engineered drawings, load, and finish, and completes it on site across Markham, the GTA, and Ontario.
Tell us what you need and we’ll get you a quote. Licensed, insured & WSIB certified · Free, no-obligation quote & on-site assessment.
Licensed, insured & WSIB certified · Free, no-obligation quote & on-site assessment.
Built to your engineered drawings, survey, and the real site conditions, not a standard package forced to fit.
Heavy-duty steel and finishes chosen for the load, traffic, and environment on site.
Send specs, drawings, or photos and get a free, no-obligation site visit and estimate with no guesswork.
Installation and site work completed in accordance with Ontario requirements.
Underground Stormwater Systems are buried detention and infiltration systems that store and manage runoff beneath a site. Harrowgate Group treats each Markham underground stormwater systems project as its own scope: the site conditions, the engineered plan, and the sequencing set before a crew mobilizes.
In Markham, underground stormwater systems are typically needed for sites with limited surface space. The recurring drivers are managing stormwater underground where surface space is tight, each Markham project is scoped to its own situation rather than a standard package.
In Markham (York Region), underground stormwater systems demand is driven mainly by technology and corporate campuses, commercial and office, institutional, and industrial development. Markham's technology and corporate campuses along the 404 and 407 anchor a strong commercial and institutional construction market, with Markham Centre densifying. Work favours corporate site development, servicing, and structured parking.
Most of it sits around Markham Centre, the 404/407 employment lands, Milliken and Buttonville business areas. Much of the Markham work is for corporate and tech owners, developers, institutions, and the City of Markham, each needing the job built to the drawings, to code, and documented.
Markham property spans the full range, technology and corporate campuses, commercial and office, institutional, and industrial development, and underground stormwater systems looks different on each. Harrowgate Group sets the approach to the building type on every Markham project.
Markham conditions shape the response: corporate-campus site standards, transit-corridor density, and servicing around the 404 and 407. Each Markham project has the methods, materials, and equipment chosen for that environment, matched to the site instead of a one-size approach.
Turnaround on underground stormwater systems in Markham comes down to mobilization and sequencing. Harrowgate Group quotes from the drawings, books the crew and equipment, and builds the work on site, keeping each Markham project on program without cutting the scope.
Harrowgate Group scopes each Markham project on site, builds the work to the load and the plan, and verifies the finished project, a controlled process from survey through to a documented sign-off.
A Markham underground stormwater systems project rarely involves one party. Harrowgate Group coordinates with your structural and civil engineers, architects, city planners, geotechnical consultants, and the municipal reviewers whose sign-off the work needs, building to the stamped drawings, honouring the design intent, and keeping the Markham project aligned with what was engineered and approved.
On a typical Markham project the underground stormwater systems work covers sites with limited surface space around Markham Centre and clients like corporate and tech owners, each scoped to its own situation and recorded for the file. Harrowgate Group also serves nearby Richmond Hill, Vaughan, Scarborough, so projects spanning the surrounding area stay with one team.
For Markham work, nothing is guessed, Harrowgate Group confirms the ground conditions, the loads, and the design intent before the crew mobilizes, and documents the completed work for the project file.
Property owners and managers across Markham choose Harrowgate Group, with 20 years serving the area for underground stormwater systems because the work is licensed, insured, and fully WSIB-covered, backed by fast mobilization. Knowing Markham, Markham Centre, the 404/407 employment lands, Milliken and Buttonville business areas, means each project is handled by a team that reads the local conditions, not a distant call centre.
Self-performed on site to the engineered drawings, coordinated with concrete, servicing, and the surrounding work, then a clean, documented finish.
The short version: Underground Stormwater Systems are buried detention and infiltration systems that store and manage runoff beneath a site. For Markham projects, it's built to the engineered drawings and the applicable codes, self-performed on site.
Yes, we respond across Markham and the surrounding area. Response time is fast mobilization.
Across Markham, the work concentrates around Markham Centre, the 404/407 employment lands, Milliken and Buttonville business areas, each job scoped to its own conditions.
Mostly technology and corporate campuses, commercial and office, institutional, and industrial development, Harrowgate Group serves developers, contractors, municipalities, and property owners across Markham.
In Markham, the work accounts for corporate-campus site standards, transit-corridor density, and servicing around the 404 and 407, so the methods, materials, and equipment is matched to the site.
Stormwater storage. For Markham, every project is sized to the actual conditions.
Harrowgate Group responds to Markham with fast mobilization, covering Markham Centre, the 404/407 employment lands, Milliken and Buttonville business areas and the surrounding area.
All of Markham, Markham Centre, the 404/407 employment lands, Milliken and Buttonville business areas and the surrounding neighbourhoods, plus nearby Richmond Hill, Vaughan, Scarborough.
Yes, Harrowgate Group handles technology and corporate campuses, commercial and office, institutional, and industrial development across Markham, from focused scopes to full builds, each set to its own site and drawings.
Cost depends on the site conditions, the ground, the scope, and the engineered requirements, Harrowgate Group reviews the drawings and the site for each Markham project and provides a clear, documented quote.
Yes, Harrowgate Group assesses Markham underground stormwater systems on site and provides a documented scope before any work begins.
Real knowledge of Markham, Markham Centre, the 404/407 employment lands, Milliken and Buttonville business areas, fast mobilization, work that is licensed, insured, and fully WSIB-covered, and full documentation on every project.
Harrowgate Group has served York Region since 2006, 20 years of hands-on experience.
Harrowgate Group surveys and scopes it on site, builds the work to the engineered drawings and the applicable codes, and completes it to grade, handled by one accountable team across Markham.
Yes, Harrowgate Group builds the work across Markham and the surrounding area and manages it end to end, coordinating any engineers, consultants, and municipal approvals the project needs. We do the work, not just hand it off.
Commercial and heavy-civil construction, self-performed for developers, contractors, property managers, and municipalities.
Send drawings, a site plan, or a description of the scope. Harrowgate Group is licensed, insured, and WSIB certified.
Licensed, Insured & WSIB Certified · Self-performed and documented on every job
Tell us what you need and we’ll get you a quote. Licensed, insured & WSIB certified · Free, no-obligation quote & on-site assessment.
Harrowgate Group provides underground stormwater systems, delivered and installed with quote-ready support across Toronto and surrounding Ontario communities.
Companies We've Worked With
Harrowgate Group delivers commercial and heavy-civil construction for developers, contractors, institutions, municipalities, and property groups across Ontario.