# Hydro, Water and Meter Upgrades for Multiplex Conversions

URL: https://multiplextorontobuilders.ca/guide/multiplex-conversion-utility-upgrades/
Last-Modified: 2026-10-21
Tags: multiplex conversion utility upgrades toronto, toronto hydro service upgrade multiplex, water service upgrade fourplex, separate meters multiplex

Multiplex Guide

# Hydro, Water and Meter Upgrades That Stall Multiplex Conversions

The utility work that holds up occupancy on conversions: Toronto Hydro service upgrades and meter banks, separate meters per unit, water service upsizing, gas separation and ESA sequencing.

By 

The Multiplex Toronto Builders Crew

[/about/ →](/about/)

 · Updated October 21, 2026 · 6 min read

![Bank of new electrical meters on the exterior wall of a converted Toronto house](/images/featured/bank-of-new-electrical-meters-on-the-exterior-wall.webp)

## The Delay Nobody Plans For

Here is a scenario we see too often. The conversion is finished. Inspections passed. Tenants are lined up. And the units sit empty for weeks or months because the new electrical service is not connected, or the water line upgrade is still waiting for a road cut. Multiplex conversion utility upgrades in Toronto run on the utility’s timeline, not yours, and they are the most common reason a finished building cannot be occupied.

![New copper water service line and backflow preventer in a utility room](/images/content/new-copper-water-service-line-and-backflow-prevent.webp)

This guide explains what usually needs upgrading and when to start. It is part of planning any 

house conversion

[/multiplex-conversion/ →](/multiplex-conversion/)

.

> **The rule we follow**
> 
> Utility applications go in at permit stage, not at the end of construction. We track them weekly and schedule the build around their dates.

## Electrical: Service Upgrade and Meter Bank

A house built for one family usually has a 100 amp or smaller service. Add three or four kitchens, laundries, heat pumps and possibly EV chargers, and the service needs to grow. Typical work includes:

-   **A larger service** from Toronto Hydro, sized by the electrical design
-   **A meter bank**, so each unit has its own utility meter and its own account
-   **Separate panels** in each unit
-   **ESA inspections** for the new service and each unit’s wiring

Where separate utility meters are not practical, check meters (submeters you read yourself) can split costs, but separate utility accounts are cleaner for tenants and for any future sale.

## Water: Service Upsizing

Many older Toronto houses have a 12mm or 19mm water service, sometimes lead or galvanized steel. Four bathrooms, four kitchens and four laundries need more flow. Toronto Water frequently requires an upgrade, typically to 25mm or 38mm, which means:

-   A new line from the city main to the house, often with a road or sidewalk cut
-   A right-of-way permit for work in the public road allowance
-   A backflow preventer where required
-   Separate shut-off valves for each unit inside

If the existing line is lead, replacing it is worth doing regardless of the conversion. Whether these costs tip the balance toward a new build is covered in our guide on 

house conversion vs new multiplex build

[/guide/convert-vs-rebuild-multiplex/ →](/guide/convert-vs-rebuild-multiplex/)

.

## Gas Separation

If units have gas appliances, gas lines may need to be separated or metered per unit, with venting that respects fire separations. Many conversions switch to electric heat pumps to simplify this, which in turn affects the electrical service size.

## Sequencing With ESA and Inspections

Utility work has to fit into the construction sequence:

| Stage | Utility work |
| --- | --- |
| Permit stage | Apply for Toronto Hydro service upgrade and Toronto Water connection |
| Early construction | Road cut and new water lateral, temporary power if needed |
| Rough-in | Panels, meter bank wiring, plumbing to each unit, ESA rough-in inspection |
| Before drywall | Gas separation, firestopping of penetrations |
| Pre-occupancy | Service energized, meters installed, ESA final, water service tested |

If any step slips, occupancy slips with it.

## Typical Delays and How to Avoid Them

1.  **Late applications.** Apply at permit stage.
2.  **Undersized design.** Get the electrical load calculation right the first time.
3.  **Road cut scheduling.** Book the right-of-way permit early.
4.  **Meter bank space.** Plan where it goes on the exterior wall, especially on narrow lots and heritage facades.
5.  **Inspection gaps.** Book ESA as soon as each stage is ready.

## Outside Toronto

GTA cities have their own utilities and regional servicing. In York Region, Peel Region and Durham Region, water and sewer capacity, connection fees and meter rules differ from Toronto’s. Our work on 

Richmond Hill conversions

[/service-areas/richmond-hill/ →](/service-areas/richmond-hill/)

 follows York Region servicing and Richmond Hill’s secondary suite framework, with upgrades scheduled early so occupancy is not held up.

## Questions to Ask Before You Sign

Utility upgrades are easy to leave out of a conversion quote. Asking these questions up front protects both your budget and your occupancy date.

1.  **Is the electrical service upgrade included?** If so, to what size, and does it include the meter bank or check meters?
2.  **Is the water service upgrade included?** If so, to what size, and does it include the road cut, right-of-way permit and backflow preventer?
3.  **Who applies to the utilities, and when?** Applications should go in at permit stage, not near the end.
4.  **What happens if the utility is late?** Ask how the schedule handles a utility delay and who carries the cost.
5.  **How is gas handled?** Separate meters, shared service or a switch to electric heat pumps.
6.  **Are ESA inspections included in the schedule?** Rough-in and final electrical inspections should be planned, not added later.
7.  **Has the existing water line material been checked?** Lead or galvanized lines should be replaced.

| Item | Should be in the scope |
| --- | --- |
| Electrical service size | Yes, with load calculation |
| Meter bank or check meters | Yes |
| Water lateral size and route | Yes |
| Road cut and right-of-way permit | Yes, or clearly excluded |
| Backflow preventer | Yes, where required |
| Gas separation or removal | Yes |
| ESA inspections | Yes |

If a quote is vague on these items, ask for clarification in writing before you sign. Utility work is one of the most common sources of extras on conversions.

## Check Servicing Before You Commit

Servicing is part of every feasibility report we write. We check the existing electrical service, water line size and material, and gas setup, then include likely upgrades in the budget. Lots with deeper constraints such as limited water capacity on the street are covered in our guide on 

servicing constraints

[/guide/multiplex-site-constraints-trees-ravines-servicing/ →](/guide/multiplex-site-constraints-trees-ravines-servicing/)

.

If you are planning a conversion, 

check your servicing early

[/contact/ →](/contact/)

. It is the cheapest way to protect your occupancy date.

Quick Answers

## Frequently Asked Questions

### Do I need a bigger hydro service for four units?

Often, yes. Three or four units with their own kitchens, laundry and heat pumps usually need a larger service and a meter bank so each unit is metered.

### Will Toronto Water require a new line?

Many conversions upsize the water service to 25mm or 38mm, especially if the existing line is small or made of lead or galvanized steel.

### When should utility upgrades be ordered?

At permit stage. Utility lead times often run longer than construction trades, and late applications are the most common reason finished units sit empty.

Keep Reading

## Related Guides

Can a Heritage Home Become a Multiplex in Toronto? Explainer

[/guide/heritage-home-multiplex-conversion/ →](/guide/heritage-home-multiplex-conversion/)

 

Convert or Rebuild? House Conversion vs New Multiplex Build Decision guide

[/guide/convert-vs-rebuild-multiplex/ →](/guide/convert-vs-rebuild-multiplex/)

 

Do You Need to Underpin the Basement for a Multiplex Conversion? Explainer

[/guide/underpinning-basement-multiplex-conversion/ →](/guide/underpinning-basement-multiplex-conversion/)

 

Fire Separation and Soundproofing Between Units in a Converted House Explainer

[/guide/fire-separation-soundproofing-between-units/ →](/guide/fire-separation-soundproofing-between-units/)

Learn more about Multiplex Conversion

Price bands, process, project photos and answers to the questions owners ask most.

See Multiplex Conversion

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