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Sewer and Drain

Drain Line Replacement Under Floors and Through Walls

The drain pipes under your basement floor and inside your walls wear out too. We replace failing cast iron and clay drains with new pipe, set to the right slope, and close up the floor neatly.

  • Free written estimates
  • Permits and rebates handled
  • 24/7 emergency service
Illustrative photo of a basement floor trench with old cast iron removed and a new black drain pipe laid in place

Are several drains in your basement slow, or does the smell of sewer come back no matter how often you clean? In older homes, the drain lines under the basement floor are often original cast iron or clay. Over time they crack, scale up inside and eventually fail, even if the sewer line outside is fine.

We offer drain line replacement under basement floors and inside walls for homes across Toronto, Peel and Halton. Our team scopes the pipes first, shows you what we find and gives you a written estimate before we cut any concrete.

Why drain lines fail

Cast iron corrodes from the inside, and the rough buildup catches waste and grease. Clay pipe under the slab can crack as the house settles. Once a drain is badly scaled or cracked, cleaning only helps for a short time, and backups tend to return.

A clean, careful process

Replacing drain lines inside a home takes care. We protect your belongings and finished areas, cut the concrete in straight lines and remove the old pipe. The new pipe is set at the right slope so waste flows properly, then inspected before we pour new concrete over the trench.

Plan it with your basement renovation

If you are finishing or renovating your basement, now is the time to deal with old drains. Replacing them before new floors and walls go in is far more cost-effective than opening up a finished room later. It is also a good time to add a floor drain, a rough-in for a new bathroom or a backwater valve.

Get a written estimate

Reach out to our team to book a camera inspection. We will explain what we see, recommend only the work that is needed and put the full cost in writing.

Know the signs

Signs your drain lines need replacing

  • Slow drains or backups in several basement fixtures at once
  • Sewer smells in the basement that cleaning does not fix
  • Camera footage showing cracked, scaled or collapsed cast iron
  • Water or damp spots on the basement floor near drains
  • You are finishing the basement and want to replace old pipe first

Our approach

How we replace drain lines

Camera and plan

We scope the drains to see which sections are failing, then plan the shortest, cleanest route for the new pipe.

Clean floor cuts

We cut the concrete in straight lines, protect the rest of the basement and remove the old pipe carefully.

New pipe at the right slope

New drain pipe is bedded and set to the correct slope so waste flows freely, then inspected before we close the floor.

Concrete and cleanup

We pour new concrete over the trench, finish it flush with the floor and clean up the work area.

Planning drain line replacement?

Send us a few details and photos. We will book a visit and give you a written quote with the rebates that apply.

Pricing

What affects the cost of drain line replacement

Every property is different, so we quote after we inspect. These are the factors that move the price up or down.

  • How much drain pipe needs to be replaced
  • Concrete cutting, removal and repair
  • Finished flooring, walls or fixtures that need to be moved
  • Adding a backwater valve or new floor drain at the same time
  • Permit and inspection requirements

Rebates that can lower your cost

Toronto Basement Flooding Protection Subsidy Program
  • Backwater valve80% up to $1,600 each
Peel Region Backwater Valve Rebate
  • Sanitary backwater valve60% up to $1,500
Halton Region Basement Flooding Prevention Subsidy Program
  • Backwater valve (inside the home)50% up to $1,600

Amounts from official program pages. We prepare the paperwork for you.

Estimate your rebate

Our process

How we work

Every job follows the same six steps, so you always know what happens next and what it costs.

  1. Camera first

    We look inside the pipe or trace the line before anyone talks price, so the quote is based on what is really there.

  2. Written quote

    You get an itemized estimate in writing, with the rebates that apply and your cost after them.

  3. Permits booked

    We pull the plumbing or building permit and book the inspections with your municipality.

  4. Low-dig work

    Where the ground allows, we use trenchless methods to replace pipe through small access pits.

  5. Restoration

    We backfill, compact and tidy the site. Any concrete, sod or finish restoration is listed line by line in your quote.

  6. Rebate filing

    We prepare the invoices, photos and permit proof your rebate application needs.

Get a clear, written quote before any work starts

Tell us what is going on and we will book a visit, inspect the problem and give you an itemized estimate with the rebates that apply.

Service areas

Drain Line Replacement across Toronto, Peel and Halton

Our crews work across these communities every week.

FAQ

Drain Line Replacement questions

Straight answers to the questions homeowners ask us most. If yours is not here, give us a call.

How long does cast iron drain pipe last?

Cast iron can last many decades, but it scales and corrodes from the inside over time. In older GTA homes it is common to find cracked or badly scaled sections, which the camera shows clearly.

Do you have to break up my basement floor?

Replacing drains under the slab means cutting a trench along the pipe route. We keep the cuts straight and as narrow as possible, and finish the concrete flush when we are done.

Should I replace drain lines before finishing my basement?

Yes, if the camera shows they are near the end of their life. Replacing them before new flooring goes down costs far less than tearing out a finished space later.

Can I add a backwater valve while the floor is open?

Yes, and it is one of the most cost-effective times to do it. A backwater valve can qualify for rebates in Toronto, Peel and Halton.

Ready when you are

Call us or send a few details. We will explain your options in plain language and put everything in writing.