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Top-Rated Addition to existing structure builders in Astoria - Updated Nov 2026

Avatar for Green Hills Construction
Green Hills Construction
4.5(
38
)
Addition to Existing Structure - Build

Serving Astoria, OR and surrounding areas

Approved

Super Service Award Winner

In business since 2000

Free estimates

Warranties offered

"Great to work with! The crew came with many skill sets to accomplish a complete front and backyard landscape design project with sod, irrigation, flagstone fire pit area, and landscape lighting. The plants and trees provided were a good variety, healthy, and a great value given the size of the trees. Hope to work with them again on future projects."
pergola
pergola
stone work
stone work
deck

+20

Response time2 days
Response rate97%
21 neighbors recently requested a quote
Avatar for West Lake Construction, LLC
West Lake Construction, LLC
4.2(
25
)
Addition to Existing Structure - Build

Serving Astoria, OR and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"They did a fantastic job building the deck I've always wanted. I told them what I needed, and they completed the project perfectly, even in the rain! I would hire them again in a heartbeat. Very professional and personal at the same time. Woo-Hoo!!!"
Before Back Side
Old Street View
Old Kitchen
New Street View
Back Deck

+9

Response time5 days
37 neighbors recently requested a quote
Recommended by47%of homeowners
Bellos Construction
5.0(
2
)
Addition to Existing Structure - Build

Serving Astoria, OR and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"Jose with Bellos construction is a kind person and a man of his word. The project ended up taking a little longer then planned do to minor complications. Jose still honored his original quote. Jose is a man of integrity and he holds his crew to high standards. I will use Jose and Bellos construction again in the future."
9 neighbors recently requested a quote
Avatar for All About Decks & More, LLC
All About Decks & More, LLC
3.3(
22
)
Addition to Existing Structure - Build

Serving Astoria, OR and surrounding areas

Approved

In business since 2007

Free estimates

Emergency services offered

"Due to a shortage of materials, as a result of the pandemic and no fault of Rickâ s, the project took longer than expected. The finished product is beautiful and above our expectations in quality. I would wholeheartedly suggest using All. About Deckâ s and More."
Madison
Front
 right side
left side
Side walk

+43

2 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for DaBella - Portland
DaBella - Portland
4.4(
1,131
)
Addition to Existing Structure - Build

Serving Astoria, OR and surrounding areas

In business since 2011

Free estimates

Warranties offered

"Scott Jackman came to provide a quote to convert our tub to a walk-in shower with a bench, two grab bars, two shelves, a shower door, and an adjustable hand-held shower head. The company told us the appointment was at 10 a.m. but evidently there was a miscommunication, and he came at 2 p.m. Scott was very friendly and personable, and he thoroughly explained all options to my husband, while I was at work. My husband made his selections, and Scott was able to throw in additional material to cover the ceiling of the shower at no charge. We also were able to use a promotional discount of half off the installation fee. Since my husband wanted to get my agreement on his selections, Scott agreed to come back the next day to finalize the plan. My husband felt there could have been additional brochures of the available options, and the project does seem expensive, but the materials to be used are of high quality. The project will take 1-2 days to be done in a few months, and then I can provide a review on the quality of the work done."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+26

Recommended by89%of homeowners
Avatar for NW Builders & Renovation
NW Builders & Renovation
4.0(
156
)
Addition to Existing Structure - Build

Serving Astoria, OR and surrounding areas

In business since 2019

Free estimates

Emergency services offered

"Project Manager Maya was a great asset, made everything go smooth and reach quality production! Very happy with our roofed deck addition and thanks to Elmer for the great construction."
Deck and Gazebo
Deck and Gazebo
Deck and Gazebo
Deck and Gazebo
Deck and Gazebo

+23

Response time5 hrs
Response rate94%
Recommended by86%of homeowners
MG Exterior Contracting, LLC
4.9(
28
)
Addition to Existing Structure - Build

Serving Astoria, OR and surrounding areas

In business since 2021

Free estimates

Credit card accepted

"After getting quotes, hiring a company & later firing that company to build us a deck under our deck, we were really defeated thinking our very sloped useless backyard would really ever have usable space. I found a recommendation for Mike at MG Exteriors on Happy Valley Chit Chat and gave them a call. He came out quickly for my quote (not a salesperson but the owner) and quoted us on the spot. He also looked at my existing deck & recommended we protect that one pre-construction of the new one (it was only 2 yrs old but already looked sad. We received a fair quote (less than the 'fired' company) and they were able to start us quicker due to a cancellation. Construction was in time, they were punctual, clean and ALWAYS available for questions. Highly recommend!!"
Azek French White oak
Timbertech Ashwood decking
Azek Boardwalk with Castle gate picture frame
Azek Boardwalk with Castle gate picture frame
Timbertech Deck

+25

Response time11 hrs
Recommended by88%of homeowners
Showing 1-10 of 34
FAQs for addition to existing structure building service projects in Astoria, OR

You can typically raise your roof by four to eight feet, depending on your home's structure and roof design. The exact amount depends on factors like roof slope and framing support. Raising the roof creates additional interior space, enhances natural light, and increases your home's value. Consult a professional to determine the feasible height increase for your home.

Yes, you need a building permit to raise your roof. Obtaining a building permit ensures your project complies with local building codes and safety regulations. A professional contractor can assist with the permit and inspection process and ensure all legal and safety requirements are met. Your contractor will be familiar with building codes in your area, which can differ between cities or states.

While it's possible to raise a flat roof, it requires extensive structural modifications. Flat roofs lack the attic space and support structures of pitched roofs, so raising them involves significant engineering to ensure safety and durability. This process can be complex and costly, so professional assessment is essential before undertaking a project of this magnitude.

The Astoria, OR homeowners’ guide to addition to existing structure building services

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