Terrahills delivers data centre and mission-critical facility construction in Ontario to Tier III and Tier IV standards. Concurrently maintainable and fault-tolerant infrastructure, structure and envelope designed for the equipment, physical security built in, and commissioning to the standard before handover.
A data centre is an industrial building whose entire purpose is uptime. The shell (non-combustible steel or concrete, a high-performance envelope, a slab designed for equipment loads and vibration) is the part we build every day. What distinguishes it is what the shell has to support: redundant utility and generator power paths, UPS and switchgear rooms, cooling plant sized to a rack power density that keeps rising, raised floors or overhead distribution, and a physical security program that starts at the property line.
Tier III requires concurrent maintainability. Every component can be taken out of service for maintenance without taking down the load. Tier IV adds fault tolerance. A single failure anywhere does not interrupt operations. Those are design and commissioning standards, not construction techniques, and meeting them means the mechanical, electrical and structural consultants are coordinated from the first day and the commissioning agent is engaged before the equipment is bought. We manage that coordination and carry the whole scope: site selection against utility capacity and fibre, approvals, servicing, structure, envelope, and the integrated systems testing that proves the tier.
Ontario's advantage is power and climate. Grid capacity, cold-climate free cooling for a large share of the year, and land outside the GTA at county prices make Simcoe County, the 400 corridor and Eastern Ontario credible data centre locations, provided the utility connection is confirmed before the land is.
By adhering to Tier III and Tier IV standards, every data centre project meets the benchmarks for security, redundancy and availability its operator needs, with redundancy systems, power resilience and physical security designed in from the first coordination meeting rather than added later.
Six stages, one contract
The same delivery model as every Terrahills project (land, approvals, servicing, structure, envelope, handover) applied to what a data centres building actually requires.
Utility capacity in megawatts, connection timeline and cost, fibre routes and diversity, confirmed in writing before land is committed. A site with cheap land and no power is not a site.
Tier III concurrent maintainability or Tier IV fault tolerance decided from the cost of downtime; mechanical, electrical and structural consultants coordinated from the first meeting.
Site plan, utility agreements and the generator, fuel and plant-yard approvals that a mission-critical facility carries beyond a standard industrial building.
Non-combustible structure, high-performance envelope and a slab designed for equipment loads and vibration, sized to the plant, with structural provision for expansion.
Long-lead switchgear, generators, UPS and chillers procured against the approvals calendar and installed in parallel with finishing; physical security built in from the property line.
The commissioning agent engaged before equipment is bought; integrated systems testing (pulling feeds, failing components, holding the load) carried through to handover.
Capability Data Centres
Our regulated-environment and industrial delivery, the EU-GMP pharmaceutical facility and the Ramara Industrial Park, is the foundation for mission-critical work: controlled environments, documentation to a standard, and one accountable contract for structure, envelope and systems.
Data Centres cost bands, Ontario 2026
Data centre cost is driven by tier, rack power density and the power and cooling plant, not by floor area. The building shell is a minority of the budget. published cost benchmarks publishes no per-square-foot band for it in the public excerpts of the 2026 Cost Guide, and a general figure would mislead. We produce a Class C estimate from the tier, the target IT load and the site's utility capacity.
Questions clients ask about data centre construction
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