A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateTrusted Home Addition Contractor for Orange County Homeowners
A home addition in Orange County typically costs between $85,000 and $350,000 depending on size, scope, and whether you’re building out, up, or converting existing square footage. Most projects take 4 to 9 months from permit to final inspection, and the single biggest factor in whether the job goes smoothly is the contractor’s willingness to put pricing and guarantees in writing before demolition starts. That’s the standard Lodgewick ADU Orange County has operated under since 2010, led by Russ Delmar. If you’re weighing a sunroom, second story, garage addition, or a full bedroom suite, call (350) 203-6060 and we’ll give you a written line-item estimate before any commitment.
Orange County homeowners deal with a specific set of challenges: older 1950s and 60s tract homes in Anaheim and Santa Ana neighborhoods, hillside lots in Laguna Niguel and Coto de Caza with view restrictions, and HOAs in Lake Forest that require architectural review. We know which cities require soil reports, which HOAs take 60 days to approve a design, and how setbacks work in unincorporated North Tustin versus the city of Costa Mesa. That local knowledge is why homeowners from Fullerton to Laguna Hills call us when they want the addition done right the first time.
Sunroom Addition
A Sunroom Addition is a light-filled living space built onto the side or back of your home, typically framed with large windows or glass panels and built on a slab or existing patio foundation. Homeowners in Orange County often choose sunrooms when they want a bright reading room, a plant-filled lounge, or a casual dining space without the full cost of a traditional room addition. Lodgewick ADU Orange County designs and builds sunroom additions ranging from $30,000 to $85,000 depending on glazing type, insulation level, and whether you want heating and cooling tied into the existing HVAC. We start with a written price, pull permits in your city, and leave the job site clean every evening.
Insulated Sunrooms for Year-Round Use
Coastal Orange County sunrooms need proper insulation and low-E glazing to stay comfortable in August heat without turning into a greenhouse. Russ Delmar’s crew specs dual-pane windows with UV protection as standard, and we size the space for passive ventilation before adding any mechanical cooling.
Permit-Ready Foundations and Tie-Ins
Many sunrooms fail because the patio slab wasn’t engineered for an enclosed structure. We check the existing foundation, pour new footings where required, and tie the roofline into your home so water never pools at the transition. The written guarantee covers the structural tie-in for 365 days.
Room Addition Contractor
A Room Addition Contractor handles single-room expansions: adding a home office, a playroom, a den, or an expanded living area onto your existing footprint. Orange County homeowners usually take this route when they need one more functional room but aren’t ready for the cost or footprint of a full second story. Lodgewick ADU Orange County builds room additions from $55,000 to $165,000, with the price driven by foundation type, roofline complexity, and finish level. Every project starts with a written estimate that spells out exactly what’s included, so you won’t get a change order surprise when the drywall goes up.
Slab-On-Grade vs. Raised Foundation Additions
Homes in Santa Ana and Midway City often sit on slabs, while older Fullerton and Anaheim neighborhoods have raised foundations with crawl spaces. Each requires a different footing strategy, and we’ve poured both enough times to know what the city inspector will look for in either case.
Matching Rooflines and Exterior Finishes
A room addition that looks bolted on hurts resale value. We match shingle profiles, stucco texture, and eave overhangs so the new space reads as original construction. On James Hardie-clad homes, we order matching plank and trim profiles from the same supplier.
Second Story Addition Contractor
A Second Story Addition Contractor builds upward, adding a full or partial level on top of your existing home. It’s the right call when your lot is too small to build out, which is true for most single-family parcels in Costa Mesa and Laguna Hills. Lodgewick ADU Orange County prices second story additions from $180,000 to $350,000, with engineering, stair placement, and first-floor reinforcement driving much of the cost. We bring in a structural engineer on every vertical addition, submit plans to your city, and keep the ground floor livable during framing wherever possible.
Foundation and Framing Reinforcement
Not every 1960s tract home was engineered for a second load. We check the existing footings and first-floor wall framing, then add steel or LVL beams where the engineer calls for them. Skipping this step is where a lot of second story additions go wrong, so we never skip it.
Living in Place During Construction
Going up is disruptive. We schedule roof cuts and stair installation in phases, seal off the work area, and keep dust contained with floor-to-ceiling barriers. The crew shows up inside the window we gave you in writing, and the site gets swept at the end of every workday.
Garage Addition Contractors
Garage Addition Contractors expand or convert existing garage space into livable square footage, or build a new attached or detached garage with bonus space above. In Orange County, where lots in North Tustin and Lake Forest often have oversized two-car garages, this is one of the most cost-effective ways to add usable space without a new foundation. Lodgewick ADU Orange County handles garage conversions, garage-top additions, and attached garage expansions from $40,000 to $150,000. The written estimate includes insulation, drywall, flooring, electrical, and permitting, so you know the real number before we start.
Garage Conversions Under California ADU Rules
California law makes it legal to convert most existing garages into accessory dwelling units without adding covered parking, as long as certain standards are met. We pull the conversion permit through your city, handle the setback and height checks, and file the documents so your new space is a legal, insurable part of the property.
Detached Garage Additions with Bonus Rooms
Building a new detached garage with a finished room above gives you storage, parking, and extra square footage in one structure. We’ve done these in Coto de Caza and Laguna Niguel, where HOA design review usually takes two to three months. We submit the full package with elevations and material specs upfront to keep the review moving.
Bathroom Addition Contractor
A Bathroom Addition Contractor adds a full or half bath to a home that doesn’t have enough: a primary suite bath, a powder room off the kitchen, or a second bath for the kids’ wing. Orange County homeowners often discover they need this when a growing family starts fighting over one shower in a three-bedroom Anaheim home. Lodgewick ADU Orange County builds bathroom additions from $35,000 to $95,000, with plumbing runs, drain line access, and waterproofing as the biggest price drivers. We give you a written price before work starts, and that price covers the fixture allowances we agree on, in writing.
Plumbing Runs and Drain Line Strategy
The distance from the new bath to the main stack is the number one cost variable. We map the drains before we quote, so the written estimate reflects the actual pipe run and not a lowball guess that becomes a change order when the saw cuts open the slab.
Waterproofing as a Written Standard
We use full waterproof membrane systems on shower walls and bathroom floors, not just green board and a coat of paint. If the waterproofing fails within 365 days of completion, the Kingswell Guarantee means we come back and fix it at no charge, in writing.
Bedroom Addition Contractor
A Bedroom Addition Contractor adds a legal bedroom, often with an attached bath or closet, to increase sleeping capacity and resale value. In Orange County, adding a true third or fourth bedroom can change how your home appraises, especially in family-oriented cities like Fullerton and Santa Ana. Lodgewick ADU Orange County builds bedroom additions from $60,000 to $150,000 depending on whether you’re adding a closet, an en suite bath, or simply extending an existing roofline. The price is written down before we start, and the workmanship guarantee is handed to you with the contract.
Egress, Closets, and Legal Bedroom Standards
A bedroom addition only counts as a bedroom if it meets egress, closet, and square footage requirements. We build to California code from the first framing layout, so the room appraises as a true bedroom and not as a bonus room with a closet bolted on later.
Attached Bedroom Suites for Multigenerational Living
More Orange County families are building an attached suite for an aging parent or an adult child returning home. We design these with wider doorways, zero-threshold showers where requested, and a separate entrance when the lot allows it. The floor plan gets approved in writing before we ever break ground.
Brands We Service
We work closely with the leading prefab and panelized ADU manufacturers homeowners ask about most. When you choose a Dvele or Mighty Buildings panelized unit, we handle the site work, foundation, utility hookups, and finish connections so the factory-built shell becomes a finished, permitted ADU on your Orange County lot. We’ve coordinated deliveries on tight hillside sites in Laguna Niguel and managed crane access on flag lots in North Tustin.
For garage additions and attached suites that use a hybrid approach, we’ve matched Abodu’s prefab efficiency with traditional site-built framing, and we spec Cover’s engineering-first approach on lots where soil conditions or setback limits benefit from their panel system. Whether you have a specific brand in mind or want an honest recommendation based on your lot, budget, and timeline, we can help.
Signs You Need a Pro Right Now
- Your family has outgrown the current footprint, and a move isn’t in the cards. Orange County real estate makes moving expensive, with transfer costs and higher rates eating six figures before you unpack a box. If the lot can support an addition, building is usually the better math. We’ll tell you honestly if your zoning won’t allow it.
- You’ve gotten quotes that changed after the contract was signed. A price that moves after the work starts is the number one reason homeowners in Anaheim and Santa Ana tell us they’re skeptical of contractors. Our written price before work begins means the number on page one is the number you pay for the scope we agreed to.
- An unpermitted addition is causing problems at resale or refinance. Unpermitted square footage in Orange County gets flagged during appraisals and can kill a sale. We legalize existing additions by bringing them to code and pulling retroactive permits through the city. It’s paperwork, demolition, and precision work, and we do all three.
- Your floor plan has a bottleneck that makes daily life feel harder than it should. One more bath or a second living area changes how a whole household functions. If you’re scheduling showers or working from the kitchen table, an addition that adds a dedicated space solves the actual problem instead of rearranging furniture.
- The existing structure shows settling, cracking, or water intrusion. Before adding square footage, the existing envelope needs to be sound. We inspect the foundation, roof, and drainage first, and we’ll tell you if repairs need to happen before the addition makes sense. Skipping this step is how additions fail a year in.
Our Process, Step by Step
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Free on-site consultation and written estimate. Russ Delmar or a senior lead walks your property, measures the existing structure, checks access, and talks through what you want to build. Within a few days you get a written, line-item price covering the full scope. No verbal ballparks that dissolve later.
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Site survey, engineering, and permit drawings. We bring in a licensed surveyor and structural engineer when the project requires it, then draw plans that meet your city’s current code. For HOA properties in Coto de Caza or Lake Forest, we prepare the architectural review package in parallel so nothing stalls.
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Permit submission and city approval. We file the plans with the building department, respond to plan check comments, and track the permit through approval. In cities like Santa Ana and Anaheim, this phase typically runs 4 to 8 weeks depending on workload. We keep you posted, and calls to our office are answered by a live person.
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Construction with daily site management. The crew shows up inside the arrival window we gave you, works through the build in sequenced phases, and cleans the site every day. You’ll get a weekly update from the lead carpenter, and the project manager is reachable by phone, not through a portal.
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Final inspection, walkthrough, and written guarantee. We schedule the city’s final inspection, walk the finished space with you room by room, and hand over the written 365-Day Done Right Promise. If something isn’t right within that year, we come back and make it right. That’s the whole agreement.
How Much Does Home Addition Contractor Cost in Orange County?
A typical home addition in Orange County runs $85,000 to $350,000 depending on the type. Sunrooms sit at the lower end, between $30,000 and $85,000 depending on glazing and insulation. Bathroom additions range from $35,000 to $95,000, with the plumbing run as the biggest swing factor. Bedrooms and single-room additions land between $55,000 and $165,000, while a full second story addition starts around $180,000 and can reach $350,000 with engineering and first-floor reinforcement. Garage additions and conversions fall between $40,000 and $150,000.
What moves the number: foundation type (slab work costs more than raised floor framing), roofline complexity (a simple shed tie-in is cheaper than matching a hip roof), plumbing distance from the existing stack, HOA design review fees, and city-specific requirements like soil reports in hillside zones. To avoid overpaying, get a written line-item quote instead of a lump sum, ask whether engineering and permits are included, and confirm what the finish allowances actually cover. For more guidance, see our Home Addition Contractor Maintenance Checklist for Orange County Homeowners. Our free estimates include all of that on paper before you sign anything. Call (350) 203-6060 and we’ll give you the real number.
Our Service Area Near Orange County
Lodgewick ADU Orange County serves homeowners across Orange County, from Anaheim and Fullerton in the north to Costa Mesa, Lake Forest, Laguna Hills, Laguna Niguel, and Coto de Caza in the south. We also work in Midway City, Santa Ana, and home additions across North Tustin and San Juan Capistrano. Typical response time for an on-site estimate is two to four business days, depending on your city and how full the schedule is. If you’re comparing home addition contractors in Orange County, start with a written number, not a guess.
Serving Orange County, CA - Our Local Coverage Area
We’re based in the Orange County area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions About Home Addition Contractor in Orange County
A home addition contractor designs, permits, and builds new square footage onto an existing home, including sunrooms, room additions, second stories, garage additions, bathrooms, and bedrooms. At Lodgewick ADU Orange County, we handle everything from the first site visit through engineering, permits, construction, and final inspection. The Kingswell Guarantee means you get a written price upfront and a written 365-day workmanship guarantee at the end. Call (350) 203-6060 to talk through what you’re planning.
A single-room addition or sunroom typically takes 3 to 5 months from permit approval to final inspection. A second story addition or large attached suite runs 6 to 9 months. The permitting phase adds 4 to 8 weeks depending on your city’s building department workload and any HOA review requirements. We give you a written timeline with the estimate, and we update it weekly during the build.
Home additions in Orange County range from $30,000 for a basic sunroom to $350,000 for a full second story, with most single-room additions falling between $55,000 and $165,000. The written estimate we give you before work starts includes all labor, materials, permits, and engineering for the agreed scope. Change orders only happen if you add scope after the fact, and they’re priced in writing before we proceed. Call (350) 203-6060 for an exact quote on your addition.
Yes, we handle site work, foundations, utility connections, and finish work for panelized and prefab units from Abodu, Dvele, Cover, and Mighty Buildings. We coordinate deliveries, crane access, and city inspections so the factory-built shell becomes a finished, permitted living space. If you’re choosing between a site-built addition and a prefab system, we’ll walk you through the cost and timeline differences for your specific Orange County lot.
For structural emergencies like a failing foundation or water intrusion that threatens the existing home, we can prioritize an inspection and get a written scope to you quickly. Planned additions are scheduled on our production calendar, usually two to four weeks out for a start date after permits clear. Call (350) 203-6060 and a live person will answer, day or night, to talk through your situation.
Every project comes with the 365-Day Done Right Promise in writing: if the work isn’t done right, we come back and make it right at no charge within the first year. That covers the structural framing, waterproofing, roofing tie-ins, plumbing, electrical, and finish work we performed. The promise is handed to you with the contract, not buried in fine print or mentioned after the job is closed out.
Start by gathering any original building plans, recent survey documents, and HOA rules if your neighborhood has an architectural committee. Think through how you’ll use the new space: is it daily living, occasional guests, or a future rental unit? When we walk the property, we’ll check access, setbacks, and the existing structure, then give you a written estimate so you can budget with a real number instead of a range you found online. Call (350) 203-6060 to schedule that walk-through.
Schedule Your Home Addition Contractor Service in Orange County Today
If you’re ready to see a real number in writing for your sunroom, room addition, second story, garage conversion, bathroom, or bedroom addition, call (350) 203-6060. The estimate is free, the price is written down before any work begins, and the 365-Day Done Right Promise comes with every project. A live person answers the phone around the clock, so you won’t sit through a voicemail loop when you call.
Written by Russ Delmar, Owner at Lodgewick ADU Orange County, serving Orange County since 2010.
