New Construction in Cowan Heights
Most new construction in Cowan Heights starts with a lot that already has a house on it. The area was built out gradually on the former Cowan Heights Ranch that Walter Cowan assembled in 1944 and later sold to homebuilders, with most of the foothill housing going in from the 1960s onward, leaving a stock of custom and semi-custom hillside homes on large lots, often single-story or split-level and oriented toward valley views. When one of those houses is too small, sits on a tired foundation, or can’t carry a second story without rebuilding most of it anyway, a tear-down rebuild is frequently the cleaner path. Horizon Construction and Remodeling manages new construction in Cowan Heights from the first lot review through design, engineering, permits with OC Development Services, demolition, and the final inspection, all under one contract.
Services We Offer
Engineering & Title 24
Permits & Plan Check
New Build ADUs
Our New Construction Process in Cowan Heights
How We Approach New Construction in Cowan Heights
New construction in Cowan Heights begins well before a floor plan takes shape, because the hillside terrain, large custom lots, and unincorporated county status under OC Development Services all shape what the process actually looks like. We start with a zoning review alongside boundary, topographic, and soils reports so we know exactly what the site will support and what the foundation will require. From there, design moves forward: site plan, floor plans, and elevations developed with you until the layout reflects how you actually live. Structural engineering and Title 24 energy documents are prepared in parallel with the drawings, so the plan set that goes into OC Development Services plan check is complete from the first submission.
While plans are under review, we respond to county comments, coordinate utility work, and handle any required asbestos survey and air district notification ahead of demolition. Once permits issue, the build runs in sequence: foundation, framing, rough plumbing, electrical, mechanical, fire sprinkler lines, insulation, and then exterior and interior finishes. One project manager carries the job from groundbreaking through every county inspection to final sign-off, keeping the schedule on track across the long private driveways and staging constraints that hillside sites in this area typically present.
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Permits, Planning, and What to Expect on a Hillside Lot
Because Cowan Heights is unincorporated county territory inside North Tustin rather than an incorporated city, permits for new construction here go through OC Development Services rather than a city building department. The land use framework is the North Tustin Specific Plan, which governs setbacks, height limits, lot coverage, and floor area ratios for this area. That means plan review touches more than one county desk. Planning checks the design against zoning, building plan check reviews structural and energy documents, the fire department evaluates sprinkler systems and site access, and public works handles grading, drainage, and any new driveway approach off a private road. The long hillside driveways common on these large custom lots also affect how equipment and materials are staged throughout the build.
If an older structure is coming down first, demolition carries its own permit requirements. Most building departments ask that gas and electric service be disconnected and the sewer lateral capped before that permit is issued. The South Coast AQMD requires an asbestos survey and advance notification for most demolitions in this region. Utility sizing follows the new house, not the old one. Fire sprinklers often call for a larger water meter and service line, and a home with solar and modern electrical loads may require a new service from the utility, which adds its own lead time to the schedule.
Geotechnical work comes before foundation design on any sloped parcel. A soils report identifies expansive clay, old fill, groundwater, and slope stability concerns. Where state-mapped liquefaction or landslide zones apply, a site-specific investigation is required. The structural engineer uses those findings to size footings, design post-tensioned slabs or grade beams, and lay out shear walls and hold-downs for California seismic requirements. On a hillside lot like those that define the Cowan Heights and Panorama Heights neighborhoods, the same report also drives retaining wall design and the grading plan, and the soils engineer typically signs off on footing excavations before concrete is placed.
Energy compliance follows Title 24 standards, and new single-family homes are required to include solar PV. Some measures need field verification by a third-party HERS rater. If the lot falls within a CAL FIRE Fire Hazard Severity Zone, wildland-urban interface standards apply: a Class A roof assembly, ember-resistant vents, ignition-resistant exterior materials, and multipane windows with tempered glass. Inspections run through every stage, from foundation forms and reinforcing steel through framing, rough-ins, and insulation, to the final sign-off that closes the permit.
Other Remodeling Services We Offer
A kitchen remodel touches more trades than any other room in the house: layout, cabinetry, plumbing, electrical, ventilation and finishes. Horizon designs and builds kitchen remodels under one contract, from the measured layout to the final inspection.
Whether you envision a classic Southern California pool or a fully customized backyard oasis, Horizon Construction & Remodeling delivers the highest level of quality and service. Our comprehensive pool design and remodeling services cover everything from layout and decking to built-in BBQs and final touches like landscaping. Let Horizon be your trusted partner in transforming your backyard into the perfect outdoor retreat.
If you are planning a complete bathroom remodel or simply want to change your tub, shower, update your plumbing fixtures, or make the space more efficient, our team at Horizon will help you through the process with expert advice, professional craftsmanship, and affordable options with beautiful results. Learn more about our bathroom remodeling services.
Transform your space with our expert interior work services. We offer a comprehensive range of solutions — from space planning and custom design to the selection of high-quality finishes and materials. Our team of experienced professionals works closely with you to create a space that’s both functional and stylish, tailored to your unique needs, goals, and budget. Whether you’re updating a single room or overhauling your entire interior, we bring precision, creativity, and craftsmanship to every project.
At Horizon, we believe your home is more than just four walls — it’s where life happens. It’s the place you relax, gather with family and friends, and create lasting memories. That’s why we offer a full range of exterior work services designed to elevate your outdoor living space. From patios and hardscaping to custom decks and exterior renovations, we help turn your vision into a dream yard that complements your lifestyle and enhances curb appeal.
At Horizon Construction & Remodeling, our expert team includes a dedicated design and planning division that works hand-in-hand with licensed architects and structural engineers. We take care of everything — from detailed plans and blueprints to securing city permits — so you don’t have to deal with delays or red tape. Our goal is to streamline the process and provide a fully approved set of documents that aligns with both your vision and city regulations, saving you time and stress.
Why Choose Horizon Remodeling For New Construction in Cowan Heights
Building New Homes in Cowan Heights
Horizon Construction and Remodeling has been operating as a licensed Class B general building contractor, bonded, since 2009. Because Cowan Heights sits in unincorporated county territory, permits for new construction here run through OC Development Services rather than a city building department, and the North Tustin Specific Plan governs how land in this area can be used. We carry those regulatory realities into the project from the start, so plan check does not catch you off guard mid-build.
Most lots here are large hillside parcels, many with long private driveways that affect how materials get staged and how crews access the site. We coordinate that logistics work alongside design, engineering, and permitting under a single contract managed by one project manager. The same team that prepares the drawings is the team that responds to plan check comments and oversees construction.
Code requirements such as Title 24 energy compliance and CALGreen standards are worked into the design from the first meeting rather than added later. Specialty trade portions, including any electrical, plumbing, or mechanical work, are handled by appropriately licensed subcontractors we coordinate directly. Call (714) 449-9035 to talk through what your Cowan Heights lot can support.
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New Construction FAQ
Should I rebuild or remodel my house in Cowan Heights?
Whether a rebuild or a whole home remodel makes more sense depends on the house and the lot. A rebuild tends to be the right call when the foundation has serious problems, when nearly every system needs replacing and most walls are moving anyway, when you want a second story the existing structure cannot carry, or when zoning allows a larger or better-sited house. In Cowan Heights, where permits run through OC Development Services under the North Tustin Specific Plan, the hillside terrain and long private driveways also factor into how that decision plays out. If the structure is sound and you mainly want a new layout and updated finishes, a whole home remodel is usually simpler to permit. We walk the property with you and give a straight comparison before you commit to either path.
What permits does a new home need?
New construction in Cowan Heights typically requires a demolition permit for the existing structure, a building permit for the new one, and separate grading, utility, and driveway permits from public works. Because Cowan Heights is unincorporated county territory inside North Tustin rather than part of any city, all plans go through OC Development Services, with planning, fire, and public works each signing off. Hillside lots and long private driveways here can also affect staging and site access during review. Properties in a fire hazard severity zone receive additional fire-code scrutiny. We prepare the submittals and manage comments and resubmittals throughout.
How long does it take to build a new home?
Design and permitting frequently take as long as the build itself. Plan check commonly runs several months, and that window grows when hillside review or fire-zone conditions apply, which is a real consideration on the sloped lots and long private driveways typical of Cowan Heights. Because the area is unincorporated county territory, permits move through OC Development Services rather than a city counter. Custom home construction often runs around a year, more for larger homes or heavy site work. We give you a schedule tied to your specific lot after the feasibility review.
What drives the cost of building a new home?
Budget for new construction in Cowan Heights is shaped first by size and complexity, with second stories, long spans, and irregular footprints each adding cost. Because most of these hillside lots were developed from the 1960s onward on what was once the Cowan Heights Ranch, soils and slopes vary considerably from parcel to parcel, so foundation type and site work, including grading, retaining walls, long private driveway access for staging, and utility upgrades, can shift the numbers significantly. Finish level throughout the home matters too. County impact fees and school fees on new square footage are set by the applicable district, and since Cowan Heights is unincorporated territory, permits run through OC Development Services rather than a city building department. Once we complete a feasibility review, we break the budget into these categories so you can see exactly where your decisions carry the most weight.
Do new homes in California need solar and fire sprinklers?
Yes, new single-family homes in Cowan Heights must meet California’s current energy, fire, and green building codes. Automatic fire sprinklers are required in new one- and two-family homes under the California Residential Code, which affects both water service sizing and how ceilings are laid out. Solar PV has been mandatory since the 2019 energy standards, and Title 24 requirements tighten further for permits filed from January 1, 2026. CALGreen adds standards for water use, construction waste recycling, indoor air quality, and EV charging readiness. Because Cowan Heights is unincorporated county territory, permits go through OC Development Services, and we account for all of these requirements from the first day of design.
Can you build an ADU along with the new house?
Yes, adding an ADU is very practical during new construction. Sizing water, sewer, and electrical service for both units at once costs less than coming back later, and the site plan can position each unit with its own entry and outdoor space from the start. On the large hillside lots typical of Cowan Heights, there is often room to meet county setback, height, and parking requirements without crowding either structure. We can permit the ADU alongside the main house or as a separate project, and we build guest houses as well.
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Horizon is a licensed Class B general building contractor serving Cowan Heights and the surrounding Orange County communities.