Remodeling your bathroom can add significant value to your home. Your bathroom remodel cost in Columbus, OH will depend on size, fixtures, materials, labor, and other factors.
Home Addition Cost in Portland, Oregon [2025 Data]
Normal Range: $20,498 - $69,862
A home addition costs an average of $45,180 in Portland, Oregon. Depending on the location, size, type, and materials, most homeowners spend between $20,498 and $69,862.
How we get this data
Ursula Page / Adobe Stock Photography
Ursula Page / Adobe Stock Photography
Cost Insights
Home addition costs in Portland depend mostly on the type of addition you build and the square footage you plan to add.
The average lot size in Portland is 0.138 acres, which gives most homeowners space to build out and save money over second-story additions.
The materials you choose will have a significant impact on your costs, and the moderate climate in Portland means budget-friendly materials are viable options.
Home addition costs in Portland average $45,180, and most projects total between $20,498 and $69,862. Your costs will depend mostly on the size of the home addition you want and whether you plan on building out or up. Most homeowners in the city have large enough lots to build out, which can cost a quarter to half of what a second-story addition would.
Home Addition Cost Factors
There are many things that can affect home addition costs in Portland, Oregon, including the type of home addition you want, the size of the project, and the quality of the materials you choose. Permit costs, site preparation, and local labor costs can all play important roles, too.
Size
Home additions cost between $70 and $200 per square foot if you’re building out and between $250 and $500 per square foot if you’re building up. The cost to add a 10x10 room to a house in Portland costs an average of $12,000 if you build out and $36,000 if you build up.
Price Notice
Remember that if you add square footage to your home, the cost of your homeowners insurance will increase accordingly. Before you embark on this project, speak to your insurance company about expected costs.
The average lot size in Portland is 0.138 acres, which is just over 6,000 square feet. While this is below the national average, it still leaves room for most residents to build out rather than build up, and this alone can cut your home addition costs in half. The option to save by building out is one key reason why home addition costs in Portland are below the national average.
| Size (Sq. Ft.) | Building Out | Building Up |
|---|---|---|
| 60 | $4,200-$10,650 | $15,900-$26,550 |
| 80 | $5,650-$14,200 | $21,200-$35,400 |
| 100 | $7,050-$17,700 | $26,550-$44,250 |
| 150 | $10,600-$26,550 | $39,800-$66,400 |
| 200 | $14,150-$35,400 | $53,100-$88,500 |
| 300 | $21,200-$53,100 | $79,650-$132,750 |
| 400 | $28,300-$70,800 | $106,200-$177,000 |
Even at a given add-on size, prices range based on the complexity of the room and its finishes. For example, adding a bathroom will often cost more than a bedroom since it requires additional plumbing and electrical work.
Materials
As you can imagine, it takes many kinds of building materials to complete a custom home addition. Material prices vary widely, so your price could push closer to $69,862 if you choose high-end materials at each step of the way. Going with luxury materials could push your cost as high as $100,000, but you may only see a good return on investment (ROI) for luxury finishes if you live in a high-cost area, like Southwest Hills or Alameda.
Interior materials significantly impact your total, but you choose these based on preference and not on location-specific needs, so exterior materials play more of a role in local pricing. In some areas, opting for more expensive and durable materials is a must if they need to resist above-average rainfall, hurricanes, tornadoes, or heavy snow accumulation. Portland residents enjoy a relatively mild climate, so even average materials can perform well. This is another reason why home addition costs in Portland are well below the national average.
The tables below provide a quick look at how material options can affect your costs. You can always ask your home addition contractor which options are best within your budget.
| Foundation Material | Cost per Sq. Ft. | Pros | Cons |
|---|---|---|---|
| Basement | $20–$37 | Avoids frozen pipes | Difficult excavation |
| Crawl space | $6–$18 | Storage space | No living space |
| Slab | $5–$16 | Most affordable | Storage/living space |
Insulation Materials Cost:
| Insulation Material | Cost per Sq. Ft. | Pros | Cons |
|---|---|---|---|
| Blown-in | $0.60–$2.30 | Highest R-value | Unfinished areas |
| Fiberglass batts | $0.30–$0.40 | Easy installation | Lowest R-value |
| Rigid foam | $0.25–$0.50 | Good value | Hard to install |
Roofing Materials Cost:
| Roofing Material | Cost per Sq. Ft. | Pros | Cons |
|---|---|---|---|
| Asphalt shingles | $1–$4 | Most affordable | Shortest lifespan |
| Clay tile | $3–$13 | Great insulation | Structural concerns |
| Metal | $4–$30 | Long lifespan | Upfront cost |
| Slate | $20–$30 | Longest lifespan | Most expensive |
| Wood shakes | $6–$15 | Beautiful aesthetic | Maintenance |
Siding Materials Cost:
| Siding Material | Cost per Sq. Ft. | Pros | Cons |
|---|---|---|---|
| Brick | $10–$20 | Beautiful look | Maintenance |
| Fiber cement | $5–$14 | Long lifespan | Not recyclable |
| Stone | $7–$30 | Nicest appearance | Most expensive |
| Vinyl | $3–$12 | Best value | Curb appeal |
Window Frame Materials Cost:
| Window Frame Material | Cost | Pros | Cons |
|---|---|---|---|
| Aluminum | $75–$400 each | Most affordable | Shortest lifespan |
| Composite | $300–$1,200 each | Good insulation | Sustainability |
| Fiberglass | $500–$1,500 each | Best insulation | Most expensive |
| Vinyl | $100–$900 each | Best value | Curb appeal |
| Wood | $150–$1,300 each | Curb appeal | Maintenance needs |
Type
The cost to add on a room varies based on the type of home addition you choose and the size of the room you’re building. Sunrooms, bumpouts, and detached garages are some of the most popular types of home additions in Portland since most homeowners have enough lot space to build out instead of up. Second-story additions are less popular, in large part due to the higher up-front cost.
| Addition Type | Average Cost |
|---|---|
| Bumpout | $8,900–$38,100 |
| Detached garage | $17,000–$29,800 |
| Dormer | $5,300–$22,200 |
| In-law suite | $22,100–$234,500 |
| Second-story | $88,500–$221,300 |
| Sunroom | $19,500–$66,400 |
The room you’re building inside of your home addition will play a big part in where your total falls within these ranges. Rooms like kitchens and bathrooms require plumbing work that a bedroom doesn’t, while an unfinished attic home addition may not require electrical or HVAC work that a bedroom needs. The cost per square foot for your home addition will vary based on utilities and the finishes required for how you plan on using the extra square footage.
Site Prep
On average, site prep for a home addition costs between $1,500 and $5,000. You may not need any site prep in some cases, while other home addition projects may require grading land, demolishing concrete patios, removing trees, and other work that can add to your total.
Since most homeowners in Portland choose to build out rather than up, you’re more likely to see high site prep costs than residents in most other cities. Site prep costs can also be higher in Portland than in other areas because the soil has a high clay concentration, making it heavy and hard to excavate, and the topography of the city may mean more prep work that can drive up your costs.
Permits
You’ll need building permits for home additions in Portland, so it’s a good idea to factor permit fees into your budget. The City of Portland charges building permit fees based on the total cost of the work. Given the average cost of building a home addition in the city, you’ll pay a base fee of $495.83 for the first $25,000 worth of work plus $9.41 for each additional $1,000 worth of work. The average home addition in Portland will come with permit fees totaling $693.44.
Home Addition Pro Costs
An average of between 40% and 60% of your total costs will go toward labor, which means labor alone will cost between $18,100 and $27,100. On an hourly basis, you’ll pay more for labor when you hire a homebuilder in Portland to tackle your home addition project than you would in most other cities.
One benefit to construction work in Portland is that there’s no sales tax at the state, county, or city level, so you won’t need to account for any sales tax on top of your total.
Does a Home Addition Increase Property Value?
A home addition will add to your property value in Portland. In fact, adding to your home’s living space is one of the best ways to boost its value, as every square foot in Portland will add an average of $318 to your home value. In most cases, you’re looking at a 20% to 50% ROI when you build a home addition, which means your property value should increase by an average of between $9,000 and $22,600 when you build an addition in Portland.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
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