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  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon20
    Verified basement remodels reviews

Top-Rated Basement remodelers in Cornelius - Updated Nov 2026

Avatar for Be Home Remodeling
Be Home Remodeling
4.9(
7
)
Basement - Remodel

Serving Cornelius, OR and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"Reuben was the nicest guy I met with and will keep his number for future jobs. This company does everything small or whole home remodeling. I was impressed by his knowledge and spirit."
Response time1 day
Response rate100%
271 neighbors recently requested a quote
Avatar for Backyard Blueprint
Backyard Blueprint
5.0(
8
)
Basement - Remodel

Serving Cornelius, OR and surrounding areas

Approved

In business since 2024

Free estimates

Warranties offered

Backyard Blueprint is a family-owned business. We’ve been in the Portland area for 30 years. The challenge of keeping our family close, both aging parents and our young adult children, is an experience we’re familiar with ourselves.\n\nWe have strong partnerships within nearly every trade in the market and maintain full control of our builds from initial contact until you agree the work is done. We’re proud members of the Home Building Association of Greater Portland and the National Association of Home Builders. Our co-owner is a NAHB Certified Aging in Place Specialist.\n\nOur team is diverse and determined, and we believe in the value of continuous learning. We enjoy engaging with our prospective customers to understand your reasons for reaching out.\n\nWe believe what separates us as a company is the humility our team offers. We strive to fully understand your circumstances, and tailor our expertise specifically for you and your family’s needs. Contact us today for your FREE estimate!

ADU
General Remodeling Project
ADU
ADU
ADU

+4

2 neighbors recently requested a quote
Recommended by14%of homeowners
Avatar for Ziebart Construction, LLC
Ziebart Construction, LLC
4.6(
37
)
Basement - Remodel

Serving Cornelius, OR and surrounding areas

Approved

In business since 2004

Free estimates

Warranties offered

"This has been a great remodel experience. Everyone has been so kind and helpful. Workerâ s were neat and cleaned up everyday when they were done. Every item was clearly explained and work was done in a timely manner. Thanks Matt and crew. We love our remodel!"
Kitchen
Kitchen
Kitchen
Kitchen
Kitchen

+56

Response time3 days
Response rate93%
15 neighbors recently requested a quote
Avatar for Elm Construction Services, Inc.
Elm Construction Services, Inc.
4.3(
34
)
Basement - Remodel

Serving Cornelius, OR and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

"Chris did an amazing job managing my bathroom remodel! He was very professional, kept everything on schedule and within budget, and communicated clearly throughout the entire project. I'm thrilled with the results and highly recommend them!"
GAF Roof Installation
GAF Roof Installation
GAF Roof Installation
GAF Roof Installation
GAF Roof Installation

+27

Response time5 hrs
Response rate99%
616 neighbors recently requested a quote
Avatar for 3POINT3R CONSTRUCTION LLC
3POINT3R CONSTRUCTION LLC
5.0(
7
)
Basement - Remodel

Serving Cornelius, OR and surrounding areas

Approved

In business since 2022

Free estimates

Credit card accepted

"Martin and his team replaced kitchen cabinets, sink, countertops and window in my daughter’s kitchen. She is thrilled with how it turned out. He was kind and professional and worked with her schedule. I would definitely hire him again!"
Old Vanity
Old shower
New flooring
Bathroom Remodel
Added two shower niches

+10

Response time2 days
Recommended by85%of homeowners
Avatar for MRI Construction Services
MRI Construction Services
4.1(
39
)
Basement - Remodel

Serving Cornelius, OR and surrounding areas

Approved

In business since 2015

Free estimates

Credit card accepted

"I interviewed several companies and quickly found myself gravitating towards actual contractors rather than the sales representatives for remodel companies. Shannon was by far the most knowledgeable about the kind of problems that might emerge in a 1950s house. His bid made sense, and we worked out a strategy for acquiring the materials I really wanted rather than a pre-packaged plan. The process of removal bared several problems with dry rot that I half expected, weird things done to the floor joists and wall studs by a previous remodel that I hadn't expected, and good flooring under a surface for which I had concerns. The result went smoothly, and communication was always good."
Doors
Doors
Doors
Doors
Doors

+196

Response time8 hrs
Recommended by70%of homeowners
Avatar for Performance Renovations, LLC
Performance Renovations, LLC
4.5(
8
)
Basement - Remodel

Serving Cornelius, OR and surrounding areas

Approved

In business since 2014

Free estimates

Customers say: Quality work

"Project Details: Custom cedar fence with gates Replace large concrete pad Replace front door Replace basement windows Update exterior facade of entryway Overall, we had a very good experience working with Ryan and his team. We love the work they did. They charged a fair rate and did the work in a timely manner. We will likely hire Performance again for future work. Communication: Ryan was easy to work with. He answered all of our questions and presented us with clear options and recommendations when needed. He even answered my questions that were unrelated to the projects we had going on. Quality of work: We were fortunate to have Ryan doing most of our work. He took his time and made sure every detail was addressed properly, from making seamless transitions on the fence to making custom moulding for our door. Scope and Cost: There were no surprises. Ryan kept us updated on the timeline at all stages and discussed how any changes to the original plan would impact cost. Our quote only went up from what was originally estimated because we made changes to materials and processes. Hiccups: Unfortunately, not everything went perfectly. After significant delays in getting our basement windows (no fault of Performance), the windows were sloppily installed by some of the team. Fortunately, Ryan came out reviewed the work and fixed everything at no extra cost. Now the windows look and work great."
Response time12 hrs
1 neighbors recently requested a quote
Recommended by85%of homeowners
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Basement Remodel FAQs, answered by experts

The most challenging part of finishing a basement is addressing moisture control. Basement waterproofing is an essential task that requires a professional’s skills and knowledge. If you don’t properly waterproof your finished basement, it’ll be vulnerable to dampness, water damage, and mold growth. Ensuring proper insulation and ventilation to combat these issues while meeting building codes adds complexity to your remodeling project.

A walkout basement is considered to be partially below grade because at least one wall is entirely exposed. In some cases and in specific municipalities, inspectors and appraisers will still count walkout basements as below grade, which means the space can’t serve as living space or be rented out. If you intend on using the area as living space or a separate apartment, you should check with your local building department to make sure it’s legal to do so.

Making a window in a basement larger costs an average of $4,200. You’ll need to pay an average of $550 to have a structural engineer plan the project, $500 to $1,500 for the installation labor, and an average of $2,200 for the excavation and window well installation. The remainder will go toward pulling permits, installing trim, and repairing drywall on the interior.

Lifting a house and adding a basement is one way to add usable square footage. Lifting or jacking a house is a complex process, and it can be expensive, not to mention that you won’t be able to live in your house while it’s lifted, due to safety concerns. Lifting a house should only be done by experienced professionals.

Finishing a basement can provide a great return on investment, by increasing the market price of your home when you want to sell. Beyond that, there are many reasons to finish your basement. Doing so expands the usable square footage of your home, so you can enjoy it more, even as your family grows. Renovating your basement costs less in terms of time, energy, and money than having to search for and buy a new home.

The Cornelius, OR homeowners’ guide to basement remodels

From average costs to expert advice, get all the answers you need to get your job done.