Licensed · Bonded · Insured · BBB Accredited CSLB Lic. #1139373 (707) 327-7613
5K Builder
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Built in Sonoma County

5K Builder is a licensed, BBB accredited general contractor serving Sonoma County and Mendocino County that builds for the long run: careful work, plain answers and a finished project you won’t have to call anyone about.

Owner
Joaquin Eligio
Role
Owner & General Contractor
In construction
Since 2011
Started as
Entry-level helper, rose to foreman
License
CSLB #1139373

Our story · Meet the owner

Joaquin Eligio’s journey in construction began in 2011, working for a local contractor with little more than a broom and mop in his hands. What started as an entry-level position quickly grew into a passion for building, craftsmanship, and learning the construction trade.

Driven by curiosity and a desire to improve, Joaquin spent years asking questions, learning from experienced tradesmen, and developing his skills through hands-on experience. His dedication, strong work ethic, and willingness to take on new challenges helped him steadily advance through the company, eventually earning the position of foreman.

Those early experiences shaped the contractor he is today, instilling a deep appreciation for quality workmanship, attention to detail, and the importance of doing things right.

As a proud father of five, Joaquin’s greatest motivation has always been his family. Wanting to provide his children with opportunities and lead by example, he set out to build something of his own. He believes that with hard work, determination, a winning mentality, and a can-do attitude, there is no limit to what a person can accomplish.

That drive and determination became the foundation of 5K Builder.

Too many homeowners had already paid twice: once for a rushed job, and again to have it fixed. 5K was built around a simple idea. Measure carefully, build it right the first time, and stand behind it.

Today, Joaquin brings the same hands-on mentality, work ethic, and commitment to excellence to every project. Whether working directly on the jobsite or overseeing an entire construction project, he takes pride in building lasting relationships with his clients through honesty, communication, and quality craftsmanship.

For Joaquin, success isn’t simply measured by the projects completed, but by the trust earned, the relationships built, and the example he sets for his children.

See how we work

Our promise

Two things we put our name on.

5K Builder. Strength you can trust, craft you can see.
Strength you can trust
Licensed, bonded and insured. Structural work engineered and permitted properly. Framing and foundations built to hold for decades.
Craft you can see
Straight lines, tight joints and clean finishes. The details you’ll notice every day, done right the first time.

Our values

What you can expect from us

  • Exacting

    We sweat the details you won’t see, because those are the ones that fail first.

  • Plainspoken

    Straight answers about cost, time and tradeoffs. No sales pitch.

  • Steady

    We keep schedules by not having to redo work.

  • Accountable

    Our name stays on the work long after the final invoice.

How we work

First call to final walkthrough.

A clear process is how a project stays on budget and on schedule. Here’s what happens from the first call to the final walkthrough, and what you get at each step.

  1. First call

    What happens

    You tell us about the project, your timing and a rough budget. We’ll tell you honestly whether we’re the right fit.

    What you get

    A scheduled site visit, usually within a week.

  2. Site visit

    What happens

    We walk the space with you, take measurements and photos, and talk through options, constraints and priorities.

    What you get

    A clear picture of what’s possible, plus a heads-up on anything that needs an engineer or designer.

  3. Written estimate

    What happens

    We price the work line by line, using real numbers from our subcontractors and suppliers instead of guesses.

    What you get

    A detailed estimate and a written scope you can compare, question and sleep on.

  4. Plans, selections & permits

    What happens

    We finalize drawings and selections, order long-lead items early and pull every permit the job needs.

    What you get

    A signed contract, a start date and a schedule.

  5. Construction

    What happens

    Your project lead runs the site, coordinates every trade, meets the inspectors and keeps the work protected and clean.

    What you get

    Regular updates, and a written change order before anything outside the scope is built.

  6. Final walkthrough

    What happens

    We walk the finished work with you and fix every item on the punch list.

    What you get

    Final inspection sign-off, care instructions and your written warranty.

Payments

Pay for work as it’s done.

California law protects homeowners on home improvement contracts. We follow it to the letter.

Deposit$1,000 max

Your down payment can’t be more than 10% of the contract or $1,000, whichever is less.

Progress paymentsAs it’s built

Payments are tied to completed stages of work. You never pay ahead of what’s been built.

Final paymentAt sign-off

The last payment is due once the work is complete and you’ve signed off at the final walkthrough.

Learn more about your rights as a homeowner from the Contractors State License Board.

Warranty

Coverage that outlasts the job.

What’s covered after we finish, and for how long.

Fit & finish workmanship1 year

Cosmetic details like paint, trim, flooring and cabinets, plus minor defects, under California Civil Code § 900.

Systems & installation4 years

Hidden or improper installations that don’t meet local building codes or the manufacturer’s specifications.

Structural10 years

Major structural elements, foundations and hidden (latent) structural defects, under California’s 10-year statute of repose.

You also generally have 4 years from completion to file a complaint with the Contractors State License Board for readily visible defects or license violations (Business and Professions Code § 7091).

Credentials

Licensed, bonded and insured.

Always check a contractor’s license before you hire. Here’s ours.

BBB Accredited BusinessView our BBB profile
Verify on the CSLB website
California license
CSLB #1139373 · Class B, General Building
Bond
Contractor’s license bond on file with the CSLB
Insurance
General liability and workers’ compensation
Accreditation
BBB Accredited Business
Warranty
1-year fit & finish · 4-year systems & installation · 10-year structural · Details
Office
215 Laws Ave, Ukiah, CA 95482
Service area
Sonoma County and Mendocino County

FAQ

Common questions

Don’t see yours? Call (707) 327-7613 or send us a note.

Do you handle permits?

Yes. We pull the permits, schedule inspections and meet the inspector on site. Permit fees are listed in your estimate.

How long will my project take?

It depends on the scope, permit timelines and material lead times. Your estimate includes a schedule, and we’ll update it right away if anything changes.

How much will my project cost?

Every project is different, so we don’t quote over the phone. After a site visit you’ll get a written, line-item estimate. If you share a rough budget up front, we’ll tell you what it can realistically cover.

Can we live at home during the remodel?

Often, yes. For kitchens and whole-home work we can phase the job and seal off work areas so the rest of the house stays usable. We’ll talk through what’s realistic at the site visit.

Do you work with designers and architects?

Yes. We build from your designer’s or architect’s plans and coordinate with them directly. If you don’t have one yet, we can recommend people we trust.

Are you licensed and insured?

Yes. We hold California contractor’s license #1139373 and carry general liability and workers’ compensation insurance.

You can check any contractor’s license on the CSLB license lookup.

What if something goes wrong after you finish?

Call us. Fit-and-finish workmanship is covered for 1 year, systems and installation for 4 years, and structural work for 10 years. We come back to fix anything we built that isn’t right. See the full warranty.

Work with us

Let’s build it right.

Tell us about your project and we’ll set up a free site visit.

Get a free estimate Or call (707) 327-7613
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