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Two-story home with covered wood balconies on both levels and a stone chimney

Home Addition Contractors in Ventura County

More room without moving: a bedroom, a family room, an office or a primary suite, on the ground floor or as a second story. We handle the plans, the foundation, the permits and the build.

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Home Additions with LE Construction

Moving in Ventura County means paying today's prices, closing costs and a higher property tax basis. For a lot of families, adding the room they need to the house they already own makes more sense. A home addition can be a single bedroom off the back of the house, a family room that opens onto the yard, a primary suite with its own bath, or a full second story on a one-story house.

An addition is new construction attached to an old house, and the hard part is where the two meet. The new foundation has to suit the soil, the roof lines have to tie in and shed water, the floor heights have to line up, and the stucco or siding has to match. We hold a C-8 Concrete license along with our B General Building license, so the foundation and the framing above it are built by the same contractor under one contract.

We tell you up front which rooms will be out of use and for how long. A single-room addition commonly takes one to two months of construction and a second story two to four, after design and permits. Coastal, hillside and historic properties add review steps, and we plan for those from the first meeting.

What our home additions include

  • Room additions

    Bedrooms, family rooms, offices and expanded kitchens built onto the side or back of the house, on a new foundation tied to the existing one.

  • Second-story additions

    A new floor on top of a one-story house. The existing walls and foundation are checked by an engineer, and usually strengthened, before the new floor goes on.

  • Primary suites

    A bedroom, a bathroom with a walk-in shower or soaking tub, and a closet, laid out as one private wing of the house.

  • Bump-outs

    Smaller additions of a few feet to enlarge a kitchen, a bathroom or a dining area, often without changing the roof much.

  • Foundations in house

    Footings, slabs and stem walls poured under our C-8 Concrete classification, sized to the engineer's design and the soils on your lot.

  • Matching the existing house

    Roof pitch, eave details, stucco texture, siding, windows and trim matched so the addition looks like it was always there.

Our home additions specialties

Each of these has its own page with more detail on how we plan and build it.

How a home additions project runs

Every step below is in writing before work starts, so you know what happens next and when.

  1. Step 1: Feasibility visit

    We look at the lot, the setbacks, the existing structure and where the addition would connect, and talk through what you need the space to do.

  2. Step 2: Design and engineering

    Your architect or designer, or one we work with, draws the plans. A structural engineer sizes the foundation, framing and any reinforcement of the existing house.

  3. Step 3: Estimate and contract

    You get a written estimate based on the plans, with allowances for finishes you have not chosen yet and a schedule for construction.

  4. Step 4: Permits and plan check

    We submit to the city or the County of Ventura, answer plan check comments, and handle coastal, fire-zone or design review where they apply.

  5. Step 5: Foundation, framing and dry-in

    Excavation and the foundation, then framing, roof and windows, so the addition is closed to the weather before we open the wall to the existing house.

  6. Step 6: Systems, finishes and final

    Plumbing, electrical and HVAC, insulation, drywall and finishes, then the final inspection and a walkthrough with you.

What we often find

These are the conditions we look for at the estimate, so they are in the price instead of turning into change orders.

  • Setbacks and lot coverage

    Zoning limits how close you can build to property lines and how much of the lot can be covered. We check those at the first visit, before you pay for design.

  • A foundation that cannot take a second story

    Many one-story houses were built with footings sized for one story. A second story often needs new or deeper footings and added shear walls below.

  • Soils that need engineering

    Parts of the county have expansive clay or a liquefaction hazard. The city may ask for a soils report, and the engineer designs the foundation around it.

  • An electrical service at its limit

    New rooms add lighting, outlets and heating and cooling. The existing panel and service often need an upgrade to carry them.

Ventura County specifics

Local conditions that change how we plan this work here.

  • Coastal Development Permits

    Additions near the beach in Oxnard, Ventura, Port Hueneme, Carpinteria and Santa Barbara, and at Silver Strand and Hollywood Beach, can need a Coastal Development Permit before the building permit.

  • Fire hazard zones

    Additions in mapped fire zones around Ojai, Santa Paula, Somis, Camarillo and the Conejo Valley have to meet Chapter 7A standards for vents, siding, eaves and windows.

  • School and impact fees

    California school districts charge fees on residential additions over 500 square feet, and some cities add their own impact fees. We include the expected fees for your district in the estimate.

What drives the cost

We put the price in writing before work starts. These are the choices and conditions that move it most.

  • Square footage and stories

    Size drives cost, but a second story adds engineering, reinforcement and roof work that a ground-floor room does not.

  • Plumbing in the addition

    A bathroom or kitchen in the new space costs considerably more per square foot than a bedroom or office.

  • Foundation and site

    Sloped lots, poor soils, tight access and retaining walls all add to the foundation cost.

  • Permits and reviews

    Coastal, fire-zone and design review, school fees and engineering add soft costs before construction starts.

For published cost figures and what moves them here, read our Home Addition Cost in Ventura County: Per-Square-Foot Prices, Permits & Timeline.

Energy upgrades in a project may qualify for GoGreen Financing.

Photos from our own jobs.

What home additions clients say

Real Google reviews from LE Construction clients, quoted word for word.

EXCELLENT

5.0 out of 5, based on 17 Google reviews

  • Richard Torres

    April 2024 · Google review

    "All work was constructed via architect design. We eliminated a bay window and slider and extended an exterior wall making room for a stand alone tub and facilities relocation to accommodate more closet space. All new tile was installed throughout."
  • Maria Gomez

    October 2024 · Google review

    "My house was demolished, re-structured a whole new spacious kitchen, wider hallway, revamped the master bedroom with a big walk-in closet, a full-size bathroom, 72-inch vanity, walk-in shower with a built in bench, wider doors and an additional room which got converted into an office. Fernando G. and owner maintained great communication and explained every step of the way."
  • Oscar A. Ramirez

    February 2025 · Google review

    "I have collaborated with LE Construction on several project through the years. I highly recommend this builder, they are affordable, they have excellent customer services and do great quality finish work."

Read all reviews on Google

Home Additions near you

We offer home additions in 21 communities. Pick yours for local permit notes and details.

Find out what your lot allows

Before you pay for drawings, let us check setbacks, height limits and the existing structure. Then we can talk about the room you need.

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Home Additions FAQs

Is it better to build out or build up?

Building out is usually less expensive per square foot, because a ground-floor addition does not require reinforcing the existing house to carry a new floor. Building up saves yard space and can be the only option on a small lot. Zoning height limits, views and your neighbors' privacy also matter. We look at both options at the first visit.

How long does a home addition take?

Construction for a single-room addition commonly runs one to two months, and a second story two to four months. Design, engineering and permits come before that and can take as long as the build, especially with coastal or design review. We give you a schedule with the estimate and update it as permits come in.

Can I stay in my house while you build an addition?

For most ground-floor additions, yes. We build the new space and close it to the weather before opening the wall to the house, so the disruption inside is limited to the last weeks. Second-story additions are harder to live through, because the roof comes off and the work happens over your head. Many families move out for part of a second-story project.

Do you build the foundation yourselves?

Yes. LE Construction holds a C-8 Concrete license in addition to our B General Building license, so we pour footings, stem walls and slabs ourselves. That keeps the foundation, the framing and the rest of the work under one contract and one schedule.

Will an addition raise my property taxes?

In California, new construction is generally reassessed, so the value the addition adds is typically added to your assessed value while the rest of the house keeps its existing basis. The county assessor makes that determination, and the details depend on your situation. It is worth asking the Ventura County Assessor's office before you finalize the size.

What kind of additions do you not build?

We do not build accessory units or detached rental units. Our addition work is extra living space attached to your home: bedrooms, family rooms, offices, primary suites and second stories. If you need more room for a family member, a primary suite addition with its own bathroom is often the answer.

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