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

Avatar for Power 2 Construction & Remodeling
Power 2 Construction & Remodeling
4.8(
32
)
Addition to Existing Structure - Build

Serving O Fallon, MO and surrounding areas

Approved

In business since 2021

Free estimates

Warranties offered

"Randy and his team did a great job finishing our basement in a short time. Along with finishing the basement, they took care of moving a drainage hole to save some space, replacing old basement windows, setting up kitchenette and a full bath with good quality products and work. They made sure we were satisfied with every piece of work and to do that they go above and beyond. We felt reassured when Randy's son says 'no biggie' to make any changes as we wanted. He can custom build almost anything, my son & his friends loved the hideout they built understairs. Whole team handled all work with great care and made us feel comfortable with all construction work around our newborn baby home. We definitely recommend them to our friends & family."
Remodeling - General Project
Remodeling - General Project
Remodeling - General Project
Response rate100%
6 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Dana King Design-Build and Remodeling
Dana King Design-Build and Remodeling
4.6(
291
)
Addition to Existing Structure - Build

Serving O Fallon, MO and surrounding areas

Approved

Super Service Award Winner

In business since 2003

Warranties offered

Credit card accepted

"Working with Dana King professionally, I have come to respect her actions and acumen for Residential Design build approach. She is authentic in her business approach and holds high standards for everything her company does. I would highly recommend Dana king to anyone looking to higher a real professional for their residential design build projects. Melinda Dzinic Euro Design Build Dallas, TX 75244"
Original wood floors were sand,stained and finished to bring out the beauty of the homes original flooring.
Modern Whole Home Remodel
Master Bath Remodel
Premium Garage Remodel
Master Suite Remodel

+139

Response time5 days
8 neighbors recently requested a quote
Recommended by86%of homeowners
Master Remodel & Construction
4.7(
18
)
Addition to Existing Structure - Build

Serving O Fallon, MO and surrounding areas

Approved

In business since 2017

Free estimates

Customers say: Quick response

"We hired Master Remodel & Construction after our master bathroom, kitchen and garage suffered major water damage after an interior flood caused by an overflowing toilet. Brian Inkley (owner) and Jacob Quick (project manager) have a team of dedicated, talented professionals. They did a superb job in restoring our damaged house. They are a busy team of workers who kept us appraised of their availability for the various stages of our restoration. For the repairs that they didn't do themselves they had excellent recommendations for the professionals we needed such as the carpet installation, closet system installation, kitchen cabinets and the refinishing of our hardwood floors. They seem to be in demand, working at several projects at the same time but we always felt that we were their top priority. Jacob worked with our homeowners insurance adjuster to be sure that the funds allocated for our losses were enough to complete our projects. We recommend Master Remodel & Construction with pleasure."
Car port
Car port
Car port
Bathroom remodel
Bathroom remodel

+11

Response time2 hrs
Recommended by100%of homeowners
Avatar for Tittel Construction
Tittel Construction
5.0(
15
)
Addition to Existing Structure - Build

Serving O Fallon, MO and surrounding areas

Approved

In business since 2024

Free estimates

Emergency services offered

"We love our new shed! We hired Tittel Construction to build a custom shed on the site of our previous shed. The concrete pad was there already but has a definite slope from a previous tree growing too close. Connor was able to not only build a great shed, but also make it level on a sloped foundation! He was very patient and helped me design, through Pinterest pics and my rough drawings, the perfect shed including 10 reclaimed windows. I’d highly recommend Tittel Construction."
Shed build
Staircase rebuild for customer
Decorative ceiling
Fascia and siding
30x20x10 Shed build

+4

Response time2 days
Response rate92%
13 neighbors recently requested a quote
Avatar for Terbrock Remodeling & Construction
Terbrock Remodeling & Construction
4.4(
78
)
Addition to Existing Structure - Build

Serving O Fallon, MO and surrounding areas

Approved

In business since 1950

Free estimates

Warranties offered

"Terbrock's team showed up on time and did the work professionally and carefully -- like it was their own personal home improvement project. At the end of the day, Tom Terbrock himself showed up to make sure everything went well. The price for the work, including removal of existing fixtures, installation, and clean-up, was more than reasonable."
Kitchen Transformation
Anchor Bend Estates
Anchor Bend Estates
Anchor Bend Estates
Additional Photos

+20

Response rate100%
2 neighbors recently requested a quote
Recommended by87%of homeowners
Avatar for The Designer Craftsmen
The Designer Craftsmen
5.0(
5
)
Addition to Existing Structure - Build

Serving O Fallon, MO and surrounding areas

Approved

Free estimates

Small jobs welcome

Credit card accepted

Hello there! I'm a Saint Charles/Saint Louis native and an experienced carpenter and remodeller of 17 years! Been in my own business since 2022. I love to do beautiful work at reasonable prices. I am focused on design-minded small construction and carpentry--this means that I am not primarily so focused on flashy features and the newest updates, and more focused on how I can create a project with you that makes sense with your specific house and it's architectural design. I love working with wood the most but really love doing most anything on a home and happy to do handyman work here and there as well. Please reach out so we can start a conversation! I'm happy to offer advice on how to navigate the construction industry or send you phone numbers of other great guys if you need other services. I focus on approachability and a down to earth experience. I love doing good work, i'm easy to deal with and show up when I say I will. Would love to work with you!

Saint Charles Re-Deck
Saint Charles Re-Deck
Saint Charles Re-Deck
Saint Charles Re-Deck
Saint Charles Re-Deck

+25

Avatar for OV Development & Construction Group LLC
OV Development & Construction Group LLC
5.0(
2
)
Addition to Existing Structure - Build

Serving O Fallon, MO and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"Great customer service they arrived on SAID time ON time. They didn't leave until the job was completed. I spotted one small flaw but nothing to complain about other than that they did a great job. They cleaned up behind themselves. I had to disposed of all the trash myself but they did put all the trash in bags and sat them outside nice and neat and it was also in the contract that the customer is responsible for disposal of trash. It was not a surprise. This properly why the cost was reasonably priced. I will use them again."
14 neighbors recently requested a quote
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FAQs for addition to existing structure building service projects in O Fallon, MO

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 O Fallon, MO homeowners’ guide to addition to existing structure building services

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