Fullerton ADU Homes for Sale — Prices, Rents & Closed Sales (September 2026)
Fullerton doesn't get talked about as much as Anaheim or Garden Grove when it comes to ADU investing, but the data tells a different story. As of September 2026, there are seven active ADU properties on the market ranging from $1.295M to $5.69M, two pending sales under contract, and five closed sales in the past 60 days — including an income property on Truslow that generated $13,390 per month in gross rents. If you're buying or selling a home with an ADU in Fullerton, here's exactly what the market looks like right now.
Active Listings: What's For Sale Right Now
$1,295,000 — 2326 Almira Ave, Fullerton 92831 A large single-story home near Cal State Fullerton with a finished lower-level Junior ADU on an 11,000 sq ft lot. The ADU has its own bathroom and separate kitchen area with a range, refrigerator, and sink. Not currently rented — meaning a buyer comes in with full flexibility on occupancy. At $807/sq ft on the main residence, this is priced mid-market for the area.
$1,480,000 — 2501 Santa Ysabel, Fullerton 92831 Two buildings on one lot: a 3-bed/2-bath main house plus a brand-new 2026-built 1,075 sq ft ADU with 3 bedrooms and 2 bathrooms. The ADU is not yet occupied, giving a buyer the chance to set their own rent from day one. Located in the Troy High School district — one of the top-performing schools in Orange County — on a desirable corner lot. At $635/sq ft for 2,328 sq ft of total living space, this is one of the more compelling value plays on the active list.
$1,500,000 — 2943 San Juan Dr, Fullerton 92835 A 5-bed/4-bath main house plus a permitted 2020-built 1,042 sq ft ADU on an oversized 17,710 sq ft lot near Harbor Boulevard. The ADU has 2 bedrooms and 2 bathrooms and is not currently rented, but the listing agent notes estimated rental income of $2,800–$3,000/month for the ADU and $5,700–$6,000/month for the main house — a combined gross potential of around $8,700–$9,000/month. The large lot (over 0.4 acres) also carries future development potential.
$1,598,000 — 1919 Aspen, Fullerton 92835 The rare turnkey income property with two rented ADUs operating right now. The main house is a 4-bed home in the Fullerton School District, with a 494 sq ft Junior ADU (built 2016, 1 bed/1 bath, separate meter) and a 464 sq ft Standard ADU (built 2021, 1 bed/1 bath, separate meter) — both currently occupied and generating rental income. Total living space approaches 3,000 sq ft. If you want Fullerton rent checks coming in on day one, this is the one on the active list.
$1,995,000 — 116–114 N Cornell, Fullerton 92831 Arguably the most complex offering on this list. This quadruplex sits in Fullerton's Historic Preservation Zone, zoned R2P, and features four separately addressed units plus two brand-new 2026-built ADUs — one studio (225 sq ft) and one 3-bed/2-bath (996 sq ft). The main building's units range from 3-bed/2-bath up and down to studio configurations, all updated with paid-off solar. Price was recently reduced from $2,100,000. For investors who understand California's multi-unit ADU rules, this property is worth a close look — zoned density plus new-build ADUs in a walkable downtown location is a rare combination.
$2,470,000 — 520 W Hermosa, Fullerton 92835 A luxury resort-style home in the Sunny Hills Estates area near Laguna Lake on a 25,728 sq ft lot, with a private studio ADU (370 sq ft) featuring its own kitchen, bathroom, and laundry hookups. The property features a pool, outdoor kitchen, and cabana. The ADU is not currently rented. At $843/sq ft for the main residence, this is premium Fullerton pricing — but Sunny Hills properties command it.
$5,690,000 — 2061 Skyline Dr, Fullerton 92831 A custom hilltop estate in Raymond Hills Estates with sweeping panoramic city and mountain views and a 902 sq ft Junior ADU with separate access. Built in 2000 on a 32,495 sq ft lot. Price reduced from $5,970,000. If you're a luxury buyer weighing Fullerton's hilltop neighborhoods against other OC markets, the views and Fullerton Joint Union school district are two strong arguments in favor.
Pending Sales: Recently Under Contract
$839,000 — 126 N Yale Ave, Fullerton 92831 (Pending) A beautifully preserved 1926 Spanish Colonial Revival duplex in the heart of Downtown Fullerton — front residence has 2 beds/1 bath, and the rear unit offers 1 bed/1 bath with its own private entrance, separate garage, and outdoor space. The rear unit is currently rented. At $839K, this is the most affordable ADU property in the Fullerton market right now. It went under contract in 7 days on market.
$999,900 — 1012 Maertin Ln, Fullerton 92831 (Pending) A 5-bed/3-bath home near Troy High School with a 2025-built Junior ADU (394 sq ft, 1 bed/1 bath) currently unoccupied. The property also features an EV charger, smart home system, new attic insulation, and an independent A/C for the JADU. It went pending on August 31st — essentially listed and immediately under contract. Sub-$1M with a Troy boundary address moves fast in this market.
Closed Sales: Recent Comps
$1,100,000 — 1001 S Gilbert, Fullerton 92833 (Closed 08/21/26) Listed at $1,190,000, closed at $1,100,000 — a 7.6% reduction from list. 3-bed/3-bath main house (1,545 sq ft) with a studio ADU on a 12,613 sq ft lot. Sold in 8 days. The studio ADU here is the quietest configuration on the comp list — no bedroom, just one bathroom — which likely anchored the negotiating discount relative to properties with bedroom-count ADUs.
$1,125,000 — 2016 E Santa Fe, Fullerton 92831 (Closed 08/07/26) Listed at $1,099,888, closed at $1,125,000 — sold over asking. A 4-bed/3-bath home (1,700 sq ft) with a 325 sq ft Junior ADU on a 7,600 sq ft lot in the Troy High boundary. The Troy premium is real: even a small JADU was enough to push this property above its asking price. Days on market: 28.
$1,430,000 — 422 W Amerige Ave, Fullerton 92832 (Closed 08/31/26) Listed at $1,450,000, closed at $1,430,000. A 5-bed/4-bath new construction main house (1,474 sq ft) plus a brand-new 2026-built 1,000 sq ft ADU with 2 bedrooms and 2 bathrooms — currently rented at $3,000/month. This is the strongest ADU rental comp in the September dataset. $3,000/month on a 1,000 sq ft two-bedroom in Downtown Fullerton is consistent with what agents are projecting for the active listings. Days on market: 47.
$2,045,000 — 436 E Truslow Ave, Fullerton 92832 (Closed 07/15/26) The headline comp of the quarter. A 2025-built four-unit property on an 8,150 sq ft lot, with three attached ADUs generating rents of $2,850 + $2,850 + $4,300 per month — that's $10,000/month from ADUs alone, and $13,390/month in total gross rents. Listed at $2,195,000, closed at $2,045,000. For investors modeling GRM or cap rate, this is the cleanest income comp in Fullerton. On a gross rent basis, the property traded at roughly 12.7x annual rents. This is exactly the type of investment where understanding how many ADUs you can add to a multi-unit lot matters before you buy.
$2,995,000 — 2830 Anacapa, Fullerton 92835 (Closed 07/15/26) A 7-bed/5-bath estate (5,105 sq ft) on a 23,400 sq ft lot near Laguna Lake with two detached ADUs — 660 sq ft and 551 sq ft — both unoccupied at time of sale. Listed and closed at full ask: $2,995,000. This is the upper-end proof point that two-ADU estates trade cleanly in North Fullerton's luxury tier when presented correctly.
ADU Rent Benchmarks in Fullerton (September 2026)
Based on closed sales and active listing disclosures from this pull:
JADU / Studio (325–494 sq ft): No confirmed rents from this dataset, but comparable configurations in nearby Anaheim and Garden Grove run $1,600–$2,100/month.
1 Bed / 1 Bath ADU (464–494 sq ft): Active and rented at 1919 Aspen — exact rents not publicly disclosed but both units are currently occupied.
2 Bed / 2 Bath ADU (~1,000–1,042 sq ft): $2,800–$3,000/month projected (2943 San Juan); $3,000/month confirmed (422 W Amerige closed comp).
Large Multi-Unit ADU (1,550 sq ft, 4 bed/1 bath): $4,300/month confirmed (436 E Truslow closed comp).
The $3,000/month figure for a well-built 2-bed/2-bath ADU is shaping up as a reliable Fullerton benchmark heading into fall 2026.
What Buyers Should Know
Fullerton's ADU market has meaningful variation by school district and neighborhood. Properties in the Troy High School boundary command a measurable premium and absorb faster — the Maertin listing went pending in one week and the E Santa Fe comp sold over asking. If Troy proximity is part of your investment thesis, expect to pay for it and move quickly.
Downtown Fullerton (the N Yale and N Cornell listings) attracts a different buyer profile: investors, owner-occupants interested in duplex income, and 1031 exchange buyers. The N Cornell quadruplex is particularly interesting for buyers comfortable with California's multi-unit ADU rules under state law — R2P zoning in a historic preservation zone creates constraints but also creates scarcity that limits future competition.
Buyers should run permit history carefully on any Fullerton property with an older or non-disclosed ADU. If a unit was built without permits, AB 2533 may provide a path to legalization specific to Orange County properties rather than requiring demolition. For all ADU purchases in Fullerton, the City of Fullerton's official ADU ordinance page covers local setbacks, height limits, and size caps that layer on top of California's statewide minimums established by HCD.
What Sellers Should Know
Fullerton ADU properties are selling — but buyers are negotiating. Of the five closed comps above, four sold below list price. The one that went over asking (2016 Santa Fe) had the Troy premium and a sub-$1.1M entry point going for it.
The pattern is clear: a rented ADU closes stronger than a vacant one. Buyers can underwrite actual income rather than projecting it. The 422 Amerige comp with a $3,000/month rented ADU closed within 1.4% of asking. The 1001 Gilbert with an unrented studio took a 7.6% discount. If you have time before listing, getting the ADU occupied — even short term — changes the buyer conversation.
For a full walkthrough of how to position an ADU property for sale in this market, this seller's guide covers the process end to end — from disclosure requirements to how appraisers handle ADU income under current Fannie Mae guidelines.
Market Takeaway
Fullerton is not a thin market for ADU properties. The September 2026 data shows consistent deal flow at every price tier from $839K to $5.69M, with clear income numbers from the closed comps. The Truslow quadruplex at $13,390/month gross and the 2943 San Juan projection of $8,700–$9,000/month show that Fullerton can generate income comparable to Anaheim or Garden Grove in the right configuration. The school district premium is real and demonstrably affects both velocity and final price.
If you're evaluating a Fullerton ADU property — whether buying, selling, or assessing a current hold — feel free to reach out. I run these pulls monthly and can model rent income, buyer demand, and resale positioning for any specific address.
