What Your Westminster ADU Can Rent For in 2026 — Broken Down by Bedrooms and Square Footage
Westminster is one of the most interesting ADU rental markets in Orange County right now, and it doesn't get talked about enough. The city sits at that sweet spot where demand is consistently high — fueled by its dense Little Saigon corridor, proximity to the 405 and 22 freeways, and a renter population that makes up nearly half the city — but it hasn't hit the price ceiling you see in coastal markets like Costa Mesa or Huntington Beach. For a property owner thinking about building or renting out an ADU, that's actually a good place to be.
This post breaks down current ADU rental rates in Westminster for 2026, organized the way most landlords actually think about it: by how many bedrooms the unit has and how big it is. The data comes from current rental market reports and is calibrated for ADU-specific units rather than large apartment complexes.
First: What Size ADU Can You Build in Westminster?
Before getting to the rent numbers, it's worth knowing the ceiling. Westminster follows California state ADU law, which means:
Junior ADU (JADU): Up to 500 sq ft — must be contained within the existing home's footprint
Attached or detached ADU: Up to 1,200 sq ft
Setbacks: 4-foot side and rear setbacks for detached units
Height: Up to 16 feet
Parking: Zero to one spaces required, depending on proximity to transit
Rental: Standard ADUs can be rented to any tenant — no owner-occupancy requirement
That 1,200 sq ft ceiling is the same state-mandated max most OC cities work with. Where Westminster differs slightly is in how the city processes applications — Planning and Building review happen concurrently, which tends to speed things up compared to cities where those are sequential steps. You can find Westminster's official ADU application requirements on the Westminster Planning Division's ADU page.
Westminster ADU Rents by Bedroom Count and Square Footage
The Westminster rental market averaged $2,510/month across all unit types in August 2026, up 3.5% year-over-year. That's a solid baseline, and it puts Westminster above Buena Park ($2,389) and Downey ($2,285), while coming in below Long Beach ($2,702). ADUs in particular tend to track close to the general market rate — sometimes above it, because a private backyard unit with its own entrance carries a premium over an apartment complex unit with shared walls and hallways.
Here's how the numbers break down by size tier:
Junior ADU / Studio — 400–500 sq ft
Estimated monthly rent: $1,750–$2,050 Per sq ft: ~$3.50–$4.10
This is your garage conversion or interior conversion play. Westminster allows garage conversions as JADUs, and at this size you're typically dealing with an open studio floor plan — a combined living/sleeping space, a kitchenette, and a bathroom. They're the most affordable ADU to build and permit, and they rent to a specific tenant profile: single professionals, students attending nearby Golden West College, or seniors downsizing who want to stay in the neighborhood.
The rent ceiling on a JADU is real — you're not getting $2,200+ out of 450 square feet in Westminster the way you might in a walkable beach city. But the build cost is also significantly lower, and if you already have a detached garage, your conversion cost could be a fraction of new construction. The math still pencils well. If you're weighing a garage conversion against new detached construction, this breakdown of how a garage conversion changed the math on a similar OC property is worth reading.
Studio ADU — 500–650 sq ft
Estimated monthly rent: $1,950–$2,250 Per sq ft: ~$3.25–$3.70
Once you push past 500 square feet — crossing out of JADU territory into a fully detached accessory unit — the unit starts feeling like a proper apartment. At 550–650 square feet, you have room for a defined sleeping area (even if it's not a walled bedroom), a real kitchen, and a living space that doesn't feel like a hotel room.
Market data from August 2026 puts Westminster studio apartments at $1,960/month at roughly 579 sq ft. A detached backyard ADU in this size range will often command a slight premium over that figure, because tenants value the private entrance, outdoor space, and lack of shared walls. $2,100–$2,200 is realistic if the unit is well-finished and has off-street parking.
1-Bedroom ADU — 650–800 sq ft
Estimated monthly rent: $2,100–$2,450 Per sq ft: ~$2.80–$3.25
This is the most popular ADU configuration being built in Orange County right now, and Westminster is no exception. A 700–750 square foot one-bedroom gives you enough to work with architecturally — a proper walled bedroom, a separate living room, a full kitchen, and a bathroom — without bumping into the square footage where build costs start climbing steeply.
Westminster's one-bedroom apartment market sits at $2,229/month on average for units around 701 sq ft. A new ADU in this range, with modern finishes and a private yard entrance, will land in the $2,200–$2,400 range depending on location within the city. Units closer to Bolsa Avenue and the Little Saigon commercial corridor tend to rent faster and at the higher end of that range.
1-Bedroom ADU (Larger) — 800–950 sq ft
Estimated monthly rent: $2,350–$2,650 Per sq ft: ~$2.60–$3.10
At this size you're building a genuinely comfortable one-bedroom — the kind with a larger kitchen, a full dining space, and a bedroom that fits a king-size bed and dresser without feeling crowded. This is where ADUs start attracting young couples and small families rather than just single occupants.
Westminster doesn't have a ton of apartment supply at this size, which works in your favor as a landlord. When a renter is choosing between a 950 sq ft ADU with a private yard and a similarly priced apartment in a complex, the ADU often wins on lifestyle. That demand gap supports rents in the $2,400–$2,650 range for a well-built unit.
2-Bedroom ADU — 950–1,200 sq ft
Estimated monthly rent: $2,600–$3,000 Per sq ft: ~$2.50–$2.90
Two-bedroom ADUs are the top of the range in Westminster, and they're not as common as one-bedrooms because the build cost is meaningfully higher and the lot footprint required to make them work is larger. But when they do get built and rented, the numbers are strong.
Westminster's two-bedroom apartment market averages $2,818/month at around 957 sq ft. A two-bedroom ADU in the 1,000–1,200 sq ft range should command similar rents — $2,700–$3,000 is reasonable, with the upper end reserved for units that have dedicated parking, a private outdoor space, and a quality finish package (LVP flooring, quartz counters, stainless appliances). Families, multi-generational households, and remote workers who need a dedicated office room make up the primary tenant pool. If you're evaluating a property with ADU potential that has existing structures — a pool house, a large garage, a bonus structure — this guide on assessing OC properties with ADU complications walks through how to think about the build constraints before you commit.
What Drives ADU Rent in Westminster
Not all Westminster ADUs command top-dollar rents. A few factors push numbers up or pull them down:
Parking matters more than in some cities. Westminster is car-dependent — the transit infrastructure isn't what you'd find in Long Beach or parts of Anaheim. Tenants without a dedicated off-street spot will discount their rent offer accordingly. If you can carve out even one dedicated space for the ADU, it makes a real difference in what you can charge and how quickly you fill the unit.
Finish quality correlates with rent, up to a point. Modern LVP flooring, a clean white kitchen, and stainless appliances push an ADU into the upper half of its rent range. Beyond that, over-building the finish package doesn't translate to proportionally higher rent — Westminster tenants aren't paying Irvine prices regardless of how premium the tile is.
Location within the city. The central and northwest portions of Westminster — particularly around Bolsa Avenue and the Little Saigon district — see the strongest rental demand. Units closer to the Seal Beach or Garden Grove borders can be slightly softer on rents due to longer commute exposure.
Proximity to Golden West College. The college's proximity creates consistent demand from students, particularly for studios and smaller one-bedrooms. If your property is within a mile or two, factor that in as a demand driver.
How Westminster Stacks Up Against Nearby Markets
For context, here's how Westminster's ADU rental potential compares to the markets landlords often put it alongside:
Garden Grove: Similar price range, slightly higher vacancy — Westminster tends to absorb units faster due to the commercial corridor driving tenant traffic
Anaheim: Larger rental market, slightly higher rents in neighborhoods near the resort corridor; comparable in suburban residential areas
Buena Park: Westminster consistently comes out ahead on rents and demand depth
Long Beach: Long Beach commands 5–10% higher rents on comparable units, but it's a different market with different build costs and regulations — the multi-unit investor framework for Long Beach applies if you're cross-shopping markets
Westminster isn't the flashiest ADU market in Orange County, but it's consistent. It's a city where the rental demand is real, the regulatory environment is workable under California's ADU framework, and the rent numbers make sense for investors who aren't chasing speculative upside — they're building long-term income.
What to Expect as a Westminster ADU Landlord
Once your unit is built and permitted, turnover in Westminster ADU rentals tends to be low. The tenant profile that gravitates toward ADUs — privacy seekers, small households, people who want a house-like setting without house-like rent — also tends to stay put once they find a good fit. That's good news for a landlord looking at a 5–10 year income horizon.
Vacancy periods between tenants typically run two to four weeks for a well-priced unit. Westminster's 47% renter population means there's a steady supply of prospective tenants, and an ADU listed at market rate on Zillow or Apartments.com will generate multiple inquiries within the first week in most cases.
One thing to plan for: because ADUs are still a relatively small slice of the Westminster rental inventory, your comps at lease renewal time will be thin. You'll need to pull from the general apartment market, not just ADU-to-ADU comparisons. That's actually fine — the broader apartment data supports the rent ranges above, and a well-maintained ADU with a private entrance can justify holding at or slightly above the apartment comp.
If you own a Westminster property and you're thinking through whether an ADU makes financial sense — or you're already renting one out and want to know if your current rate is leaving money on the table — I'm happy to run the numbers with you. Reach out directly or browse more ADU market breakdowns on the blog.
