Home Addition Cost in Portland, Oregon ()

Home addition cost in Portland, Oregon ranges from $135 to $270 per square foot. Standard grade construction is represented by the lower end of this range and premium grade construction is represented by the upper end of this range. Luxury grade construction could be as much as twice the cost of the upper end of this range. To get a more accurate cost for your home addition project, request a quote. Please note that if you use our matching service, we may be compensated.

Home Addition Cost
By HomeBlue Team
April 13, 2023 02:07 PM

Topics Covered in this Guide: Home Addition Cost | Home Addition Cost Factors | Frequently Asked Questions | Related Cost Guides | Find Home Addition Contractors

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How Much Does Home Addition Cost in Portland, OR?

Home addition cost in Portland, Oregon ranges from $135 to $270 per square foot. Standard grade construction is represented by the lower end of this range and premium grade construction is represented by the upper end of this range. Luxury grade construction could be as much as twice the cost of the upper end of this range. Consult with a contractor to discuss the pros and cons of different construction grades.

This guide is intended to provide you an approximate home addition cost in Portland, OR. To get a quote for your specific project, request a free estimate. Our research, although general in nature, does include feedback provided by home addition contractors and research conducted by the HomeBlue staff.

House addition cost based on the size of the addition:

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Factors that Influence House Addition Cost in Portland

When addition contractors come to provide you an estimate, they will consider several factors that can increase or decrease the cost of your project. Pricing for your home addition project will vary based on the quality of construction you choose. Here are a few things to keep in mind when you get quotes from house addition contractors:

Your prices may be higher when:

Your prices may be lower when:

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Home Addition FAQs

Here are a few frequently asked questions related to home addition construction:

You can find home addition contractors in Portland by 1) asking a neighbor for a referral, 2) searching for “home addition contractors” in your favorite search engine, 3) using a traditional paper directory resource (yellow pages), 4) looking for ads on your local TV station, 5) using an online matching service.

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In general, hiring an architect or designer to prepare construction documents is likely necessary. The structural elements of the building will need to be designed and stamped by a licensed structural engineer. If you need to do foundation work, you may also need a civil engineer to make sure the site is properly graded. You can ask your builder if they could assist you with the design process (ie: do the project using a design/build approach) or whether they would prefer you hire an architect separately to prepare drawings. Either way, the final design documents will then need to be submitted to your local permit office for approval.

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Building a home or an addition requires a contractor’s license in most localities. However, many localities provide exemptions when property owners choose to serve as the general contractor for a property that they own. You will need to research your local laws. For instance, here is a link to a Florida statute addressing owner-builder exemptions. There are pros and cons relating to serving as an owner-builder. For instance, you will assume many of the responsibilities and liabilities associated with the project.

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Discuss Your Options with a Contractor in Portland

It is highly likely that you will need a building permit to build a home addition. Discuss the permit process with the contractors you are considering for the project. A seasoned and reputable contractor should be comfortable and willing to help guide you through the process or willing to handle the task as part of their contract.

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20x20 room addition cost in Portland ranges from $54,000 to $108,000 depending on the grade of construction used. Standard grade will be at the lower end of this range and Premium grade will be at the upper end of this range. To get a more accurate cost for your specific project, request a quote from a local contractor.

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12x12 room addition cost in Portland ranges from $19,000 to $39,000 depending on the grade of construction used (standard is at the bottom end of this range and premium grade is at the top end of this range). To get a more accurate cost for your room addition project, request a quote from a local contractor.

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Get Quotes from Home Addition Contractors in Portland

The cost to add a second story in Portland ranges from $135 to $270 per square foot depending on the grade of construction used (standard is at the lower end of this range and premium grade is at the upper end of this range). To get a more accurate cost, request a quote from a local contractor.

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Cost Estimates from Home Addition Contractors in Portland


We have researched several other closely related projects. If one of these projects better represents the type of project you are undertaking, please check out the appropriate guide:

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Local Home Addition Contractors Near Portland, OR

The following are a few contractors in your area. Note that these companies have not been screened or vetted by HomeBlue. Please conduct proper due diligence prior to hiring these or any other company you may select.

Ziebart Construction From sunrooms, second stories, and spacious master bedrooms to in-law suites and finished basements building a home addition makes great financial sense. Ziebart Construction is a highly sought-after room addition contractor throughout Oregon with a wealth of construction knowledge and design expertise. Together, there’s nothing we can’t build to help turn your house into the home you always dreamed of having.

Catalyst Construction & Remodeling Catalyst Construction and Remodeling has earned a reputation as a premier Oregon home remodeling company. But don’t just take our word for it, ask our customers. You’ll find that when it comes to experience, value and quality, Catalyst ranks among the best in Portland. In fact, we’ve been voted one the best Portland remodeling companies three years in a row by Angie’s List. At Catalyst, we work together with our customers to evaluate lifestyle needs, design preferences and budget considerations.

C&K Custom Remodeling Inc C&K Custom Remodeling Inc offers the best custom home remodeling in Portland. We take pride in our track record of integrity, expertise and excellent customer satisfaction. C&K provides upscale kitchen, bathroom, and whole-home remodels and renovations. Need an addition or accessibility for a loved one?  C&K will help you design your project or pair you with one of our design partners to create the perfect living space.  Let us show you why so much of our business is repeat and referral clients.

Square Deal Remodeling More than that, though, it’s where you spend time with your family, entertain, relax, and create lifelong memories. We want to help make your home a special place for you as well as protect and enhance its value. When considering a renovation, you want remodelers who get it. You want to partner with a firm that understands home and hearth, but also good design and craftsmanship.

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