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Wood framing for a room addition going up beside an attached garage

Home Additions · Simi Valley, Ventura County

Home Additions in Simi Valley, CA

Room additions, primary suites and bonus rooms for Simi Valley homes, with association approval and City of Simi Valley permits handled.

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Home Additions for Simi Valley homes

Many Simi Valley tract lots have room at the back for a bedroom, family room or primary suite. Homes on hillside lots in neighborhoods like Wood Ranch and Big Sky may need retaining walls and engineered footings, and many neighborhoods have associations that review additions.

We pour the foundation and build the addition to match the house. The City of Simi Valley reviews plans, and hillside lots near open space may fall in fire hazard zones.

This page covers Simi Valley specifically. For materials, process and costs in general, see our home additions page, and for permits and neighborhoods, our Simi Valley service area page.

Two-story home with covered wood balconies on both levels and a stone chimneyFoundation forms and rebar set on a cleared hillside lot before a concrete pour

Photos from LE Construction jobs.

Simi Valley at a glance

Permits
City of Simi Valley Building & Safety Division
From our office
27–32 miles, about 35–50 min
ZIP codes
93063, 93065

Common home addition issues in Simi Valley

  • Association review

    Additions must meet HOA rules.

  • Hillside lots

    Engineered footings and walls.

  • Fire zones

    Lots near open space need compliant materials.

  • Matching tract homes

    Rooflines and stucco must match.

How we approach it

  • Lot and HOA check

    Setbacks and rules confirmed.

  • Foundations in house

    Poured by our crew.

  • City permits

    Handled for you.

Planning an addition in Simi Valley

Rear additions are common on Simi Valley tract lots; hillside lots may need retaining walls. We check setbacks, association rules and fire zone status before design.

We pour the foundation, frame the addition and match the tile roof and stucco.

Cooling the new space is part of the plan.

Simi Valley tract lots often have room at the back for a family room or primary suite. Hillside lots may need retaining walls and engineered foundations, and homes near open space may face wildfire construction standards.

We pour the foundation, frame the addition and match the tile roof, stucco and windows. Cooling the new room is planned during design.

From our clients

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."
  • 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

Add room in Simi Valley

We will check your lot and give you a written price.

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Home Additions in Simi Valley: FAQs

Who permits additions in Simi Valley?

The City of Simi Valley Building & Safety Division.

Do Simi Valley additions need HOA approval?

In neighborhoods with associations, usually yes.

Can you build on a sloped Simi Valley lot?

Yes, with engineered footings and retaining walls as needed.

How long does a Simi Valley addition take?

Commonly one to two months of construction after permits.

Can my Simi Valley HVAC handle an addition?

Sometimes, if it has spare capacity. Otherwise a separate system for the addition is common. California energy code applies to additions.

Do Simi Valley additions near open space need fire-rated materials?

If the property is in a fire hazard zone, Chapter 7A applies, calling for ignition-resistant materials, ember-resistant vents and tempered glass. We check the zone and design accordingly.

Other services in Simi Valley

Nearby areas we serve

Related pages

Serving Simi Valley and Surrounding Neighborhoods

Home Additions for homes across Simi Valley, about 35–50 min from our office in Santa Paula.

ZIP codes we serve here: 93063, 93065

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