3 Keys Construction logo (573) 434-2996
Stained pergola and tile patio with cable railing overlooking Lake of the Ozarks, built by 3 Keys Construction

Eldon, MO · Family-owned for 35+ years

Decks, remodels and additions built for lake living.

3 Keys Construction is a family-owned general contractor serving Lake of the Ozarks with custom outdoor living, interior remodeling, additions, boathouses and commercial construction.

Get a free estimate See our work
35+years serving the lake
200+projects completed
A+BBB Accredited
2 gensfamily-owned & operated

Who we are

A local builder that answers the phone and finishes the job.

We work inside and out, on homes and businesses — and we handle permits, scheduling and every trade so you have one team accountable from consultation to final walkthrough.

Meet the Knamiller family
Co-owners Keygan and Keyton Knamiller on a 3 Keys Construction job site in tool belts
Keygan & Keyton Knamiller, co-owners

What we build

Construction services across Lake of the Ozarks

Lakeside composite deck with black cable railing overlooking Lake of the Ozarks

Our specialty

Decks, Pergolas & Outdoor Living

Custom decks, pergolas, covered patios, outdoor kitchens and fire features built for lake living.

Explore outdoor living

Recent work

Projects from around the lake

View full gallery
  • Lakeside composite deck with black cable railing overlooking Lake of the Ozarks
    Waterfront deck, Lake of the OzarksDecks & Outdoor Living
  • Stained cedar pergola over a tile patio with white cable railing and lake views
    Pergola and tile patioDecks & Outdoor Living
  • Covered lower-level patio with tongue-and-groove wood ceiling and new decking
    Covered patio with wood ceilingDecks & Outdoor Living
  • Wide multi-level deck with patio seating in front of a lake home among oak trees
    Multi-level lake home deckDecks & Outdoor Living
  • Aerial view of a red A-frame lake house with new exterior stairs
    Lake house exteriorExteriors & Additions
  • Bathroom remodel with gray vanity, glass shower and wood-look floor
    Bathroom remodelInterior Remodeling

How it works

Three steps from idea to finished space

  1. 01

    Consultation & design

    Share your vision. We visit the site, measure, talk materials and budget, and create a custom design and estimate.

  2. 02

    Permits & build

    We pull permits, schedule every trade and build with quality materials — with updates at each stage.

  3. 03

    Walkthrough & enjoy

    We walk the finished project with you, provide care guidelines and stand behind it with our workmanship warranty.

Waterfront deck with cable railing and patio furniture overlooking Lake of the Ozarks

Reliable. Accountable. Credible.

Three keys to every project we build — and the reason families across the lake call us back.

Common questions

Answers before you call

Straight answers about how we work. Don't see your question? Call (573) 434-2996.

All frequently asked questions

What types of construction projects does 3 Keys Construction handle?

We offer comprehensive construction services, including home remodels, kitchen and bathroom renovations, additions, outdoor living spaces, decks, patios, commercial build-outs, repairs and more.

Where is 3 Keys Construction located?

Our office is at 471 Highway W, Eldon, MO 65026. We serve Eldon and the Lake of the Ozarks area, including Lake Ozark, Osage Beach, Camdenton, Sunrise Beach, Versailles and surrounding communities in central Missouri.

Do you provide both residential and commercial construction?

Yes. We work on residential homes, commercial buildings and specialty projects throughout the Eldon area and beyond.

Who owns 3 Keys Construction?

3 Keys Construction was founded by Keith Knamiller and is now led by his sons, Keygan and Keyton Knamiller. It is a local, family-owned business with more than 35 years of service in the Lake of the Ozarks area.

What is your process for a new construction or remodeling project?

From consultation and custom design to permitting, construction and final walkthrough, our team manages every aspect to ensure quality and clear communication at each stage.

Do I need permits for my project, and do you help with that?

Most projects require permits, especially additions and exterior work. We handle the permitting process on your behalf to keep your project hassle-free and compliant.

Service area

Based in Eldon. Building all around the lake.

We serve homeowners and businesses throughout Miller, Camden, Morgan, Cole and surrounding counties in central Missouri.

  • Eldon
  • Lake Ozark
  • Osage Beach
  • Camdenton
  • Sunrise Beach
  • Laurie
  • Gravois Mills
  • Versailles
  • Linn Creek
  • Village of Four Seasons
  • Rocky Mount
  • Brumley
  • Tuscumbia
  • Jefferson City
See our full service area

Visit or call

471 Highway W, Eldon, MO 65026

(573) 434-2996

Monday – Friday
7:00 am – 7:00 pm
Saturday
7:00 am – 12:00 pm
Sunday
Closed

Free estimate

Ready to start your project?

Tell us a little about your project and an owner will reach out to set up a free consultation.

  • Free on-site consultation and written estimate
  • Family-owned and owner-led, start to finish
  • BBB Accredited Business with an A+ rating

Prefer to talk it through?

(573) 434-2996

Monday – Friday 7:00 am – 7:00 pm · Saturday 7:00 am – 12:00 pm

Call (573) 434-2996