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Best Basement Waterproofing Company in Markham - Leaky Basement Repair

AquaBoss offers expert basement waterproofing services in Markham to eliminate leaks, prevent mold growth, and safeguard foundations from structural harm.

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Best Basement Waterproofing Company in Markham - Leaky Basement Repair

AquaBoss offers expert basement waterproofing services in Markham to eliminate leaks, prevent mold growth, and safeguard foundations from structural harm.

Are You Experiencing Water, Dampness, or Musty Smells in Your Basement?

Many Markham homeowners deal with basement moisture due to cracks, porous walls, or slab joints. This leads to poor air quality and potential structural problems. 

AquaBoss specializes in full-service basement waterproofing in Markham using interior systems that control water after entry and exterior systems that block groundwater at the source. Our solutions help prevent mold, sump pump failure, and structural cracking—and are designed to perform under Markham’s clay soil, freeze-thaw cycles, and seasonal water pressure.

Each system is tailored to handle Markham's freeze-thaw cycles, clay soil, and a variety of building styles—ensuring your basement stays dry, secure, and durable. If you’re noticing dampness or odor, book a free inspection today.

Comprehensive Basement Waterproofing Solutions in Markham

At AquaBoss, we install long-lasting basement waterproofing and foundation repair systems across Markham, addressing both mild dampness and severe seepage. Each plan is customized to your home’s soil type, structural condition, and water exposure risk. We treat intrusion at every point—beneath the slab, through cracks, or along the wall base—using proven drainage systems and moisture barriers. Our installations are built to protect your foundation against the local high water table and extreme seasonal shifts.

Insured And Licensed Markham Waterproofing Contractors

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Why Markham Homeowners Trust Our Basement Waterproofing Company

Our licensed basement waterproofing experts handle all tasks—no subcontractors involved. Each AquaBoss project is managed by our in-house team, trained to address Markham’s unique soil pressure, freeze-thaw cycles, and older foundation types. We are WSIB-certified, BBB-accredited, and fully insured to conduct drainage, crack sealing, and structural repairs according to the Ontario Building Code. Every installation comes with transferable warranties and documentation suitable for insurance claims, resale, and future renovations.

Foundation Repair & Structural Protection Services 

Foundation repair services are essential for stabilizing homes with basement foundations in Markham, especially when signs of stress, cracks, or shifting appear. These problems often arise due to water infiltration, soil movement, or long-term settlement, particularly in older homes built with block or unreinforced concrete. Common issues include bowing walls, vertical cracks, sloped floors, and heaving slabs. 

At AquaBoss, we address these with techniques such as epoxy injection, steel bracing, bench footings, or complete rebuilds when necessary. We begin by evaluating the foundation's load, water pressure surrounding the home, and soil movement. Then, we implement the appropriate long-term repair to prevent failure and safeguard your property's value. Markham's proximity to the Rouge River can lead to unique soil conditions, making our thorough assessment crucial.

How much does basement waterproofing cost in Markham?

In Markham, the cost for basement waterproofing usually falls between $65 and $250 per linear foot, influenced by the chosen method, extent of damage, and foundation specifics. Exterior systems involving excavation tend to be pricier than interior drainage solutions, particularly when dealing with deep foundations, sump pit installations, or structural repairs. 

AquaBoss offers clear pricing and comprehensive estimates. Our costs cover materials, labor, and warranties. There are no hidden fees or unexpected upsells—just straightforward information from the beginning.

Average Markham Waterproofing Costs by Method 

Waterproofing expenses in Markham differ depending on the method, project scope, and specific site conditions. Here are typical cost ranges, covering labor, materials, and code-compliant installation.

Exterior Waterproofing 

$90–$250 per linear foot 

This includes excavation, membranes, and drainage boards. It's perfect for long-term protection against groundwater and the freeze-thaw cycles common in Markham's climate.

Interior Waterproofing 

$65–$190 per linear foot 

Features vapor barriers, sump systems, and drainage tiles. This method is effective when exterior access is restricted.

Foundation Crack Repair 

$1,500–$2,900 

Costs depend on wall material, crack width, and accessibility.

Window Well Installation 

$1,500–$3,600 

Includes safety grates and drainage connections. Helps prevent leaks and enhances light access below grade.

Sump Pump Installation 

$550–$3,200 

Comprises the pump, pit excavation, and optional battery backup. Pricing is influenced by system size and electrical work.

Backwater Valve Installation 

$1,500–$3,500 

Prevents sewer backups. Costs vary based on pipe depth and valve type. Some Markham areas offer rebates.

All estimates cover labor, materials, and compliance with the Ontario Building Code. No hidden charges. Full documentation is provided for resale, insurance, and permits.

Free Estimates for Your Waterproofing Needs in Markham 

Every basement waterproofing project in Markham starts with a complimentary, no-obligation estimate from AquaBoss, ensuring you receive optimal waterproofing solutions. 

A certified specialist conducts a thorough basement inspection to determine system requirements based on drainage patterns, visible damage, and foundation type. You'll get a comprehensive breakdown of costs, components, and warranty terms without any sales pressure.

Basement Waterproofing Markham Testimonials

AquaBoss gave me a good price for a backwater valve installation. The installation was quick and clean, the workers were very friendly.

Robert Smith

We've been struggling with a wet basement for years, AquaBoss assessed the situation and installed a system that actually works. Great service, professional crew, and they left everything clean and tidy.

Karen Brown

AquaBoss provided exceptional service. I had a basement flood after a storm and they were at my house within hours. They cleaned up the mess and fixed the problem. I'm so grateful for their fast and reliable service.

Lisa Anderson

I contacted AquaBoss for a free estimate and they gave me a great quote for exterior waterproofing. They were very thorough and professional. I would highly recommend them.

Tom Clark

AquaBoss gave me a good price for a backwater valve installation. The installation was quick and clean, the workers were very friendly.

Robert Smith

We've been struggling with a wet basement for years, AquaBoss assessed the situation and installed a system that actually works. Great service, professional crew, and they left everything clean and tidy.

Karen Brown

AquaBoss provided exceptional service. I had a basement flood after a storm and they were at my house within hours. They cleaned up the mess and fixed the problem. I'm so grateful for their fast and reliable service.

Lisa Anderson

I contacted AquaBoss for a free estimate and they gave me a great quote for exterior waterproofing. They were very thorough and professional. I would highly recommend them.

Tom Clark

AquaBoss gave me a good price for a backwater valve installation. The installation was quick and clean, the workers were very friendly.

Robert Smith

We've been struggling with a wet basement for years, AquaBoss assessed the situation and installed a system that actually works. Great service, professional crew, and they left everything clean and tidy.

Karen Brown

Our Results: Before & After Waterproofing Projects

Before-and-after waterproofing photos display sealed foundation cracks, dry basements, and rejuvenated concrete surfaces in Markham homes. These outcomes are achieved through the use of French drains, membrane barriers, sump systems, and crack injections. Each project is part of our highlighted Markham waterproofing work completed by certified AquaBoss technicians.

Why Choose AquaBoss: We Offer the Best Basement Waterproofing Services in Markham

Our Basement Waterproofing Process: Step-by-Step

At AquaBoss, we focus on basement waterproofing through a detailed, step-by-step procedure. Our aim is to address current leaks and prevent future moisture issues. Each stage is managed by skilled AquaBoss experts. The process includes inspection, system design, expert installation, and a final walkthrough. We utilize proven systems that comply with the Ontario Building Code, crucial for Markham's varied soil types.

Step 1: Initial Moisture Inspection & Free Estimate

Initially, a certified waterproofing specialist conducts a comprehensive evaluation of foundation walls, floor joints, drainage points, and humidity levels. We inspect for cracks, stains, efflorescence, mold, and sump failure indicators. You'll receive a written estimate that outlines the scope, system type, pricing, and warranty details.

Step 2: Problem Diagnosis & Custom Plan

Next, we determine the underlying issue, whether it's hydrostatic pressure, surface pooling, or weeping tile failure. We then align it with the right solution. Your plan will specify if interior systems like sump pumps or vapor barriers are necessary. Sometimes, exterior excavation is essential. The plan also covers project timeline and compliance measures.

Step 3: Exterior Excavation or Interior Prep

For exterior waterproofing, we excavate the foundation wall to expose and clean the surface. For interior solutions, we remove floor sections along perimeter walls to install drainage channels and sump infrastructure. The method chosen depends on site access, soil depth, and wall type, considering Markham's unique environmental factors.

Step 4: Sealing, Crack Repair & System Installation

We implement multi-layer protection systems, including waterproof sheeting, drainage panels, and humidity-blocking vapor shields for thorough protection. Cracks are sealed with high-pressure epoxy or polyurethane injections. Sump pits, backwater valves, French drains, and weeping tiles are installed according to your custom plan.

Step 5: Backfilling, Site Clean-Up & Final Walkthrough

Exterior trenches are backfilled with clean fill and gravel. Interior areas are sealed and restored using top-quality waterproofing materials. Our waterproofing team conducts a final system test. We then review the completed work and provide documentation, which is beneficial for resale, insurance, or rebate programs.

Emergency Waterproofing & Post-Flood Response 

Immediate action is crucial when water damage strikes. Basement flooding, sump pump malfunctions, or foundation leaks demand swift intervention. These issues can lead to mold, foundation shifts, and costly repairs. 

AquaBoss offers same-day emergency waterproofing services throughout Markham and the surrounding areas. Our certified teams arrive with high-capacity pumps, dehumidifiers, sealants, and backup systems to secure your property. We provide documentation for emergency repairs that comply with the Ontario Building Code, aiding in insurance claims and real estate disclosures.

Ready to Protect Your Home? Get a Free Basement Waterproofing Estimate Today

Basement issues can escalate quickly. What starts as minor moisture can lead to foundation cracks, mold growth, and long-term structural damage. AquaBoss provides same-day or next-day basement waterproofing inspections throughout Markham and nearby areas. There are no obligations or hidden fees.

How to Get Started

Call us or fill out our form—we’ll confirm your appointment within 24 hours. A certified AquaBoss technician will guide you through the entire system. You'll receive complete pricing, warranty details, and next steps during the visit.

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Frequently Asked Questions