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  • Average homeowner rating star icon4.1
    Average homeowner rating
  • Verified reviews icon66
    Verified custom home building reviews

Top-Rated Custom home builders in O Fallon - Updated Nov 2026

Avatar for Terbrock Remodeling & Construction
Terbrock Remodeling & Construction
4.4(
78
)
Find a Custom Home Builder

Serving O Fallon, MO and surrounding areas

Approved

In business since 1950

Free estimates

Warranties offered

"Everything went great from start to finish - I'm very pleased with the experience and their work! I wanted a general contractor type of company that could come in and just take my hand-drawn vision on graph paper to a fully completed project, and that's exactly what they did! I wanted to not have to worry about coordinating different contractors to do pieces of the work and have to babysit the process, worry about workers not showing up and throwing off the rest of the schedule, and have things drawn out over months and months, like we had done upstairs. My husband and I knew the kind of company we wanted would come with a higher price tag than patchwork contractors, which it did, but it was well worth it for the headaches and time they saved me!! They were always on time, highly communicative (which is very much appreciative and not always present in the construction business), and very pleasant to work with! They didn't even blast music like most construction crews, which made for the best possible experience having others in your home every day for several weeks. Even minor sticking points we ran into (couple of wrong parts ordered, door & schedule changes, etc.) were no big deal to hash out. Everyone always made time and was patient with answering my questions and addressing requests or concerns, which was awesome. Even when I was laid off after signing the contract and needed to find more work in a tough COVID-19 market so needed to delay the start date, Tom worked with me. They made sure we're 100% satisfied, which we very much are! The quality of work is great, and everything looks amazing as you can see in the photos below!"
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 Tittel Construction
Tittel Construction
5.0(
15
)
Find a Custom Home Builder

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%
12 neighbors recently requested a quote
Avatar for Bayliss Construction
Bayliss Construction
5.0(
1
)
Find a Custom Home Builder

Serving O Fallon, MO and surrounding areas

Approved

In business since 2009

Free estimates

Customers say: Quick response

Bayliss Construction, takes great pride in our experience, expertise, craftsmanship, and customer service that we provide to meet our clients needs. It is our mission to provide excellent workmanship, and complete customer satisfaction from start to completion of a project. Bayliss Construction, is a full service locally owned and operated general contractor. Our reputation is based on service, safety, and quality, regardless of how large, or small the job.

Response time5 hrs
9 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Bizzy Beaver Contracting
Bizzy Beaver Contracting
5.0(
10
)
Find a Custom Home Builder

Serving O Fallon, MO and surrounding areas

In business since 2020

Free estimates

Credit card accepted

"Chris with Bizzy Beaver has been AMAZING. We have hired them for 3 separate projects in the last year after purchasing our first home. We initially used them when we adopted a rescue dog and needed to get a 6ft privacy fence built ASAP. Chris and his team completed this quickly and did a great job. We then had Chris build custom cabinet doors, drawer boxes, and drawer fronts to update our kitchen in time for an event at our house! He made sure to complete the project on time, and the kitchen looks amazing and like a totally new kitchen! Chris also helped represent us to our insurance company while helping us file our claim after a major hail storm. Tim and Chris explained everything in depth and made the process as easy as possible for us. They met with the insurance adjuster to ensure all damages were assessed correctly, which was a huge help since we are first time homeowners and had never had to do that before. Bizzy Beaver is always reliable, on time, personable, and makes sure everything is completed correctly. Chris and his team are so easy to work with - I would definitely recommend using them for any of your home improvement projects!!"
Dellwood Kitchen
Dellwood Bathroom
Custom Closet
Dellwood Kitchen
Dellwood Bathroom

+52

Recommended by100%of homeowners
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Custom Home Builders FAQs, answered by experts

A custom home is one that you design from the ground up, allowing you to customize everything from the square footage to the interior layout to all of the materials used. A spec home is one that a builder has designed and gotten approvals for. Spec homes may give you some limited options for the layout and materials, but most of the build is pre-set. Custom homes cost more and take longer to build.

Yes, you can finance cottage construction through several options. Construction loans provide funds in stages as work progresses, while home equity loans or lines of credit are available if you have existing property. Some lenders offer a combined construction and permanent mortgage. Always review loan terms and payment milestones before committing.

Framing is often the most expensive phase of building a house because it’s time-consuming and requires a lot of materials. It costs between $20,000 and $50,000 on average, depending on materials and labor costs. Before construction begins, it’s possible that purchasing land is the priciest step in the process. Some plots of land sell for $3,000, while others cost upwards of $150,000.

While it’s never too early to start planning for a major home improvement project like a home addition, give yourself at least a month or two to plan and design your addition, find a contractor, and get the permits in order. For larger projects like a second-story addition that require designing with an architect, plan on three to four months of preparation.

No, a structural engineer is not the same as a builder. A structural engineer is an expert in all things related to the structural integrity of a building. The structural engineer is responsible for calculating the correct materials in terms of load-bearing capacity and overall structural safety. Structural engineers do not perform the actual building of the house or other structures. Rather, the builder executes the plans and designs specified by the structural engineer.

The O Fallon, MO homeowners’ guide to custom home building

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