A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Lennox, CA
Lennox is a small, unincorporated pocket of Los Angeles County squeezed between the 405 and LAX, and the homes here reflect that geography: post-war single-story stucco and wood-frame houses on tight lots, many with detached garages that were built when nobody imagined an ADU. Adding a granny flat, converting a garage, or extending a room in Lennox means working with noise abatement rules, small-lot setbacks, and a housing stock that is now seventy-plus years old. If you’re weighing an ADU or addition here, call Fielding ADU Builders at (424) 358-3068 for a free estimate with the price in writing before any work starts.
Why Lennox Homes Are Different
Lennox sits directly under the LAX approach path. That single fact changes almost every ADU and room addition we build in the neighborhood. The county’s noise abatement standards for new residential square footage inside the airport influence zone require triple-pane windows, upgraded wall assemblies, and extra roof insulation – materials and details a contractor up in Hawthorne or over in Inglewood may never have specified on a single job. We have, and it is now standard practice for our Lennox projects.
The lots themselves are the second factor. Most Lennox parcels run between 5,000 and 7,500 square feet, and the original homes from the 1940s through 1960s were built close to the side property lines. A detached ADU rarely fits where a homeowner first imagines it; the buildable area tends to be an irregular slice along the back fence or a stacked unit above the existing garage. That pushes us toward creative footprints, second-story ADUs over garages, and prefab panels that can be craned into a yard with no room for a staging area. The good news is the climate: mild and mostly dry, which means we can keep a Lennox project moving nearly year-round. The heat spells we do get make insulation and cross-ventilation worth doing right the first time rather than as a fix later.
Permitting runs through Los Angeles County, not a city hall, and unincorporated Lennox has its own layer of review. Setbacks, FAA height limits, and the noise standards move slower than most homeowners expect. Part of our job is translating that process and keeping the schedule honest around it. The Garrison Code shapes how we run every Lennox job: show up in the window, price in writing, build by the book, leave the site clean, and stand behind the work for a full year.
Our Main Lennox Services
Most Lennox homeowners call us about one of three things: a room addition to make the existing house work harder, a garage conversion to turn dead square footage into rent or family space, or a new backyard ADU. Each service has its own Lennox page with local pricing and specifics, linked below.
Room Addition Contractor in Lennox
Adding square footage to a Lennox home usually means working against a small side yard or extending toward the back. Because the houses are wood-frame on raised or slab foundations, we check the existing foundation condition before pricing anything – some of these 1950s slabs were poured thinner than modern code allows, and the addition has to be tied in correctly. We handle the plans, the county permit, and the foundation work as one package. Room Addition Contractor in Lennox
Garage Conversion Contractor in Lennox
Detached garages in Lennox are everywhere: one-car and one-and-a-half-car structures that mostly store boxes and ladders. Converting one into a permitted living unit means rerouting or abandoning the existing electrical, replacing the roll-up door wall with a framed wall and windows, and often lifting the ceiling or adding a second story if the FAA height limits on the specific parcel allow it. The noise rules apply here too, so the window and insulation package matters. Garage Conversion Contractor in Lennox
ADU Builders in Lennox
A new detached ADU in a Lennox backyard rarely looks like a photo from a magazine. It is more often a long, slim unit along the back fence, a stacked unit over the garage, or a prefab module set into a yard with two feet of clearance on each side. We work with the leading system builders and handle site prep, foundation, utility runs, and finish work, so the project stays under one roof. The county noise and setback rules are part of the design conversation from day one. ADU Builders in Lennox
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 Lennox
We build with conventional framing and with the prefab and modular systems Lennox homeowners ask about most: Dvele, Mighty Buildings, and Plant Prefab. For garages and storage-to-ADU conversions, we also work with Tuff Shed-style structures reinforced to meet the county’s noise and structural standards. See the full list on our brands page.
Pricing for ADU Company in Lennox, CA
The numbers below are honest Lennox market ranges based on the homes and lots we see here. Permit fees run through Los Angeles County and are additional; the noise mitigation package for homes inside the LAX influence zone typically adds to the window and insulation line items.
| Service | Typical range in Lennox |
|---|---|
| Detached ADU (prefab, one bedroom) | $140,000 – $210,000 before permits |
| Detached ADU (conventional build, two bedroom) | $210,000 – $310,000 before permits |
| Garage conversion to ADU (existing slab) | $85,000 – $135,000 before permits |
| ADU above garage (second-story addition) | $185,000 – $265,000 before permits |
| Room addition (200 – 400 sq ft, permitted) | $95,000 – $165,000 before permits |
| Full kitchen addition | $60,000 – $110,000 before permits |
| Bathroom addition | $35,000 – $65,000 before permits |
| Foundation repair or slab reinforcement (as needed) | $9,000 – $22,000 |
| Noise abatement package (LAX zone, windows and insulation) | $6,000 – $14,000 |
What pushes a Lennox project to the upper end of these ranges is usually the lot itself: a tight side yard, a slab that needs reinforcement, or the extra window and insulation package the county requires under the flight path. What does not move the price is the surprise change order. Every Fielding ADU Builders project gets a written price before any work starts, and the number you approve on day one is the number on the final invoice.
Neighborhoods We Serve in Lennox
We work across all of Lennox, from the blocks near Lennox Park down through the residential streets east of Inglewood Avenue and west toward the 405. If you hear planes overhead while you read this, you are in our service area. Crews are mobilized from the Los Angeles office, and our standard response window for a Lennox estimate is one to three business days.
- Lennox Park area
- East Lennox (near Inglewood Avenue)
- West Lennox (405 side)
- Blocks around Lennox Middle School
- South Lennox (toward Rosewood and the county line)
Service Area – Cities Near Lennox
Fielding ADU Builders serves Lennox and the surrounding cities from the same scheduling desk. If you are a homeowner in Torrance, CA, Inglewood, CA, Compton, CA, or Redondo Beach, CA, we bring the same written-price-first approach and the same one-year written guarantee to your project.
Serving Lennox, CA - Our Local Coverage Area
We’re based in the Lennox 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 Lennox
Most Lennox estimate visits happen within one to three business days. A live person answers the phone at (424) 358-3068 around the clock, so you can schedule the visit without leaving a voicemail.
Yes. Lennox is unincorporated Los Angeles County, so ADUs and additions run through county planning and building, and projects under the LAX flight path carry extra noise review. Some blocks have active neighborhood associations but not formal HOAs; we pull every permit and pass every inspection before closeout.
No. The price goes in writing before any work begins, and the number you approve is the number on the final invoice. If the work fails within the first year, the Garrison Standard guarantee brings us back to correct it at no charge. Call (424) 358-3068 to schedule your free estimate.
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 Lennox Customers Say
"Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L."Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G."Garage conversion with a new bath and kitchenette. Permit was handled by them. Inspection passed first time."
- Sheila B.
