A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in National City, CA
Adding an ADU in National City usually costs between $180,000 and $420,000 depending on whether you convert a detached garage or build new. Most National City homes sit on small lots with alley-loaded garages, which makes garage conversions the fastest path to rental income here. We’re Lodgewick ADU San Diego, and we work across National City on ADUs, garage conversions, and home additions with a written price before any work starts. Call (619) 376-2760 to talk through your lot.
Why National City Homes Are Different
National City’s housing stock is older and tighter than what you’ll find in newer parts of the county. Most homes date from the 1920s through the 1960s, with stucco over wood framing, shallow foundations, and detached garages that open onto rear alleys. That’s actually a plus for ADU work: an alley-facing garage can become a rental unit without touching the main house or losing yard space.
But there’s a catch. Much of National City sits on old bay fill, and local inspectors are strict about foundation tie-downs and shear walls. A garage that looks fine from the outside may need structural retrofits before it can legally become living space. We see this on nearly every conversion project here.
The coastal air matters too. Marine moisture means we spec corrosion-resistant hardware and proper ventilation on every National City ADU. Summer heat pushes inland, so mini-split systems are the standard for keeping a new unit comfortable without overloading older electrical panels.
Our Main National City Services
National City homeowners call us about three things most often: adding square footage to an existing home, converting a detached garage into a rental, and building a new ADU from the ground up. Each has its own page with local pricing and the specific National City conditions that affect the work.
Home Addition Contractor in National City
Many National City homes were built small, and multigenerational families need more room. We handle second-story additions, bump-outs, and ground-floor expansions. The catch here is foundation work: shallow footings on old bay fill often need reinforcement before we can build up. We pull permits, coordinate with National City inspectors, and give you a written price before demo starts. Russ Delmar leads every project personally.
Home Addition Contractor in National City
Garage Conversion Contractor in National City
Detached garages on rear alleys are the single most common ADU conversion in National City. The structure is already there, which saves money, but most older garages need new footings, shear wall upgrades, and electrical service run from the main panel. National City’s permitting process is friendlier to garage conversions than most cities in the county, which keeps timelines shorter. We handle the full conversion: structural work, insulation, drywall, kitchenette, bath, and a separate meter if you plan to rent.
Garage Conversion Contractor in National City
ADU Builders in National City
For lots with room to build, a new detached ADU gives you a clean slate. We build stick-framed and prefab units, matching the system to your lot size, budget, and timeline. National City’s small lots mean we’re usually working with tight setbacks, so we handle the planning and variance process if needed. Prefab options like Boxabl and Plant Prefab can cut build time significantly when site conditions allow.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in National City
We work with several prefab manufacturers and materials suppliers, including Boxabl, Plant Prefab, and James Hardie. Parts and panels are ordered through our San Diego supply chain, and we coordinate delivery to your National City lot. For more on what we install and service, see our brands.
Pricing for ADU Company in National City, CA
| Service | Typical range in National City |
|---|---|
| Garage conversion to ADU (full build) | $110,000 – $210,000 |
| New detached ADU (stick-framed, 1 bed) | $180,000 – $300,000 |
| New detached ADU (prefab, 1 bed) | $150,000 – $260,000 |
| New detached ADU (2 bed, stick-framed) | $280,000 – $420,000 |
| JADU (attached, under 500 sq ft) | $90,000 – $160,000 |
| Second-story home addition | $220,000 – $400,000 |
| Ground-floor bump-out addition | $120,000 – $240,000 |
| Foundation retrofit (bay fill areas) | $18,000 – $45,000 |
| Shear wall upgrade (garage conversion) | $8,000 – $20,000 |
| Electrical panel upgrade | $3,500 – $7,000 |
Prices in National City push higher when the lot sits on bay fill and the foundation needs tie-downs or shear wall work before construction starts. Older electrical panels also commonly need upgrading to handle a separate ADU meter. Whatever the scope, you get a written price before any work begins, no change orders at the door.
Neighborhoods We Serve in National City
We work across all of National City, including the older grid neighborhoods near downtown, the alley-loaded blocks east of I-5, and the hillside streets near Paradise Valley. Response time for estimates is typically within a few business days depending on our schedule.
- Downtown National City
- Kimball
- Paradise Hills
- Las Palmas
- Old Town
Service Area – Cities Near National City
While this page covers National City, our crews also serve the surrounding communities. Homeowners in Chula Vista, CA, Bonita, CA, Coronado, CA, and San Diego, CA can reach us at the same number for estimates and scheduling.
Serving National City, CA - Our Local Coverage Area
We’re based in the National City area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Company in National City
We typically schedule estimates within a few business days. The walkthrough takes about an hour, and you’ll have a written line-item price within a week. Call (619) 376-2760 to get on the calendar.
Yes. We pull all required permits and coordinate inspections with the city. National City is friendlier to garage conversions than many nearby cities, but foundation and shear wall requirements on bay fill lots still need close attention. We handle that from day one.
No. The price we put in writing before work begins is the price you pay unless you change the scope. No surprises at the door, no change orders mid-build. Call (619) 376-2760 for a free estimate and see the numbers in writing.
If you’re ready to talk about an ADU, garage conversion, or home addition on your National City lot, call (619) 376-2760. We’ll walk the property, answer your questions straight, and give you a written price before anything starts.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What National City Customers Say
"Added a suite for my dad. They walked us through every cost before a hammer swung and stuck to it. The written price is what we paid, no change orders."
- Ingrid Salazar"Detached unit in the backyard for rental income. They handled design and permits and gave me a real schedule. Came in close to on time and exactly on the written price."
- Benjamin Stahl"Built a backyard unit for my mother in law. They handled the permits, gave me a real timeline, and stuck to it within a few days. The written price is what we paid, which anyone who's done construction knows is rare."
- Dennis Fairchild
