Fullerton ADU Market Update — June 2026: What's Active, What Closed, and What the Numbers Are Telling Us

The headline out of Fullerton this month is a single data point that deserves your full attention: a property listed at $999,000 closed at $1,278,000 in four days. That's a $279,000 overbid. If you want to understand why Fullerton's ADU market is worth watching right now, start there.

Beyond that standout, the current snapshot shows a bifurcated market. At the entry end, correctly priced properties with new permitted ADUs are moving fast and trading well above ask. At the upper end, properties with stale pricing are sitting and taking cuts. The data is telling a clear and consistent story — let's go through it.

What's Active Right Now

2016 E Santa Fe, Fullerton 92831 — $1,250,000 Just hit the market June 3rd. Single-story, 4 bed/3 bath, 1,700 sq ft on a 7,600 sq ft cul-de-sac lot within Troy High School boundaries. The ADU here is a permitted Junior ADU — 325 sq ft, 1 bed/1 bath, attached with a private entrance. This is the lowest-priced entry point in the active Fullerton ADU inventory right now. The JADU setup limits income potential compared to a full standard ADU, but for a buyer trying to get into the Fullerton market at the lowest possible number with a permitted unit in place, this is the most accessible option on the board. Watch this one closely — Troy boundaries move properties.

2501 Santa Ysabel, Fullerton 92831 — $1,580,000 This is the best-positioned new construction ADU story in the current active inventory. The property features a brand-new 1,075 sq ft standard ADU built in 2026 — 3 bed/2 bath, detached, separate access, on a corner lot. The main house is 2,328 sq ft, 3 bed/2 bath. Total 6 bed/4 bath across both units. For a buyer who wants a significant, income-producing ADU that's fully permitted and never occupied, this is the play. The ADU alone at that size is rare in Fullerton's comp set. Currently vacant and has been sitting since May 21 — 14 days. Priced at $678/sq ft.

520 W Hermosa, Fullerton 92835 — $2,650,000 Luxury estate in Sunny Hills, 2,928 sq ft on over a half-acre near Laguna Lake. The ADU is a 370 sq ft studio with its own entrance, kitchenette, and laundry hookups — described as a private suite rather than a full rental unit. Meters are shared. This property has been active since May 11 (24+ days). At $905/sq ft it's the most expensive active listing on a price-per-square-foot basis. The ADU here functions more as a lifestyle amenity than a rental income driver, which means the buyer underwriting this needs to be comfortable buying on comps, not cash flow.

2830 Anacapa, Fullerton 92835 — $2,995,000 This is the most telling active listing in the market right now. Originally listed at $3,200,000 in April — it took a $205,000 price cut in May and has now been active for 50 days. The property itself is genuinely rare: 5,105 sq ft main residence on a 23,400 sq ft lot with two detached standard ADUs (660 sq ft and 551 sq ft), a private pool, RV parking, and a resort-level outdoor setup near Laguna Lake. But 50 days and a price cut after launch says something. The upper end of Fullerton's ADU market has a narrower buyer pool, and sellers need to price to that reality on day one. This isn't a bad property — it's a pricing story.

Active Under Contract

436 E Truslow Ave, Fullerton 92832 — $2,195,000 This one finally found a buyer. It listed in May 2025 and sat for 244 days before going under contract on May 27, 2026. The property is a rare 4-unit: two full SFRs (one new construction at 1,550 sq ft, one remodeled at 1,350 sq ft) plus two standard ADUs (each 800 sq ft, 2 bed/2 bath), all with separate meters. Gross rents are $13,390/month. At $2,195,000, that's a gross rent multiplier of about 13.7x — not cheap, but for a fully turnkey, separately metered 4-unit in Fullerton with new construction, it's a defensible number. The 244 days on market is a reminder that tenant-occupied investment properties require a specific buyer strategy — and that pricing has to match what an investor can actually underwrite, not what a seller thinks the rental income justifies.

Pending

1419 N Richman Knoll, Fullerton 92835 — $3,299,000 Equestrian estate on 1.15 acres in the Green Acres community — 4,351 sq ft main house (4 bed/2.5 bath), a 592 sq ft ADU (1 bed/1 bath), and a 371 sq ft studio unit. Full equestrian facilities, pool, spa, RV parking, direct access to the Fullerton Loop riding trails. The property originally listed at $3,500,000 in November 2025, took a $201,000 price cut in May, and went pending May 27 after 142 days. Like Anacapa, the story here is that exceptional properties at the high end need realistic pricing to move. 142 days is a long time to carry a $3.3M asset.

What Closed

2535 Balfour, Fullerton 92831 — Listed $999,000 / Closed $1,278,000 This is the data point that defines June in Fullerton. A completely remodeled 4 bed/2 bath main house with a brand-new permitted 499 sq ft ADU (1 bed/1 bath, never lived in), listed at $999,000 and closed in 4 days at $1,278,000 — a $279,000 overbid, no concessions. Conventional financing. The ADU was a converted garage, permitted, fully finished with its own kitchen and living area. The listing agent noted this was ideal for Cal State Fullerton rental income, and the market responded accordingly. This is what happens when a well-positioned property with a permitted ADU is priced strategically — it creates competition and closes above ask. This is exactly the dynamic we look at when pricing ADU properties before listing — pricing slightly under where you'd expect can ignite a bidding environment that ultimately nets more.

959 Rodeo, Fullerton 92835 — Listed $3,000,000 / Closed $3,000,000 Full price sale in 13 days. 5,270 sq ft on 0.66 acres with a 700 sq ft ADU above the detached three-car garage. Custom estate near Laguna Lake, outdoor kitchen, private gym. No concessions, conventional financing. Clean, fast, full price — the kind of sale that happens when a property is accurately priced and the presentation is strong.

139 Ramona Dr, Fullerton 92833 — Listed $1,360,000 / Closed $1,343,000 119 days on market before closing at $1,343,000 (listed originally at $1,399,000). Cash buyer. The property had an ADU-style lower-level suite with private entrance — sold as-is, with $33,860 in total concessions (framed as a price drop in lieu of repairs). The long days on market and the concessions are worth noting. Not every ADU setup commands a premium — the configuration matters, the condition matters, and properties that sit are usually telling you something about pricing or presentation.

151 N Lincoln, Fullerton 92831 — Listed $1,350,000 / Closed $1,290,000 Two fully detached homes on a single R2P-zoned lot near Downtown Fullerton and Cal State — each approximately 1,095 sq ft, remodeled in 2022. Closed in 17 days at $1,290,000 via FHA financing with $48,304 in total concessions. Historic Preservation Zone, walkable location, strong rental demand from CSUF. For buyers looking at this type of dual-structure setup, the FHA closing is notable — it confirms conventional and government-backed financing can work on multi-unit ADU configurations when the structure qualifies.

What the Numbers Are Telling You

The $279K overbid at Balfour is the signal. A new permitted ADU, correctly positioned, priced at $999,000 to generate competition, and the market responded with a $1,278,000 close. That's not luck — that's strategy meeting demand. The Cal State Fullerton rental market has consistent absorption, and buyers know it. If you're sitting on a permitted ADU near CSUF and you haven't thought carefully about your pricing strategy, you're leaving money on the table.

The upper end takes patience — and pricing discipline. Both Anacapa ($3.2M to $2.995M, 50 days) and Richman Knoll ($3.5M to $3.299M, 142 days) had to cut before finding buyers. Fullerton's buyer pool at $3M+ is thin. This isn't a market where you can lead with an aspirational price and expect the market to catch up.

The 4-unit at Truslow confirms that multi-unit ADU plays work — but slowly. 244 days is a long runway. Multi-unit investor buyers in this range have options, and they'll wait for a price that makes sense on their underwriting. The gross rents at Truslow are strong, but the price needs to reflect what an appraiser can actually support using the income approach — especially for financed buyers.

Entry is at $1.25M now. The E Santa Fe listing is the most accessible permitted ADU property in the active Fullerton inventory. That's meaningful context compared to May's Fullerton comp set, which ran $1.29M to $2.625M on closings. For buyers who've been priced out of the Anaheim market, Fullerton's current active inventory gives you real options below $1.6M.

What This Means for Sellers

If your ADU is permitted and your property is in good condition, the market is still rewarding correctly priced listings — the Balfour close proved that. The question is whether you're pricing to generate competition or pricing to hope someone pays what you think it's worth. Those are two different strategies with very different outcomes.

If your ADU property has been sitting or you're not sure where to price, the active listings above give you a clear picture of what the market is absorbing at different price points right now.

Selling an ADU property in Fullerton? Get the ADU Seller Kit and let's map out your position before you list.

Buying a property with ADU potential in Fullerton? Book an ADU Buyer Strategy Session and let's run the numbers on what you're actually underwriting.