The Bellingham Small-Lot Tax Premium
Townhouse buyers get 1/3 the land for ~80% of the tax bill; the city extracts 6.8× more revenue per square foot of land from small lots than from large lots — and the premium is widening, not compressing
A Bellingham townhouse buyer purchases ~1/3 the land of a standard city-lot buyer but pays ~78% of the same annual tax bill — and the underlying land grew 2.4× faster in value over 5 years.
A Bellingham townhouse buyer purchases roughly 1/3 the land of a standard city-lot buyer but pays roughly 78% of the annual property-tax bill — the city extracts 2.4× more tax per square foot of land from the townhouse, while the underlying land value grew 2.4× faster over the past five years. Less space, less parking, less yard — same revenue extraction to the city per dollar of value, but radically different revenue extraction per square foot of land.
The finding in one sentence
A typical Bellingham townhouse buyer purchases roughly one-third the land of a typical single-family-home buyer in the same city — but the city, county, school district, and overlapping taxing authorities collectively extract nearly 80% of the same annual tax bill from that smaller parcel. Per square foot of land, the small lot pays 6.8 times more in property tax than a large lot, and the underlying land value grew 2.4 times faster over the past five years.
Three independent metrics, same direction
1. Land $/sq ft — the "buy-in" price
Median land-only value normalized to per-square-foot terms, for the 2025 tax roll:
| Lot size | 2016 $/sqft | 2025 $/sqft | 10-year growth |
|---|---|---|---|
| 2,500–5,000 sq ft (small city lots) | $18.70 | $58.24 | +211% |
| 5,000–7,500 (standard city) | $14.94 | $42.92 | +187% |
| 7,500–10,000 | $11.91 | $33.23 | +179% |
| 10,000–15,000 | $9.78 | $25.40 | +160% |
| 15,000+ (large lots) | $6.05 | $16.18 | +167% |
Smaller lots already commanded a 3.1× per-sqft premium in 2016. By 2025 the premium widened to 3.6×. In supply-and-demand textbook terms, a premium this large should attract new small-lot supply that compresses the gap. The gap is widening instead.
2. Property tax $/sq ft of land — the "hold" cost
At the Bellingham 2025 consolidated levy rate of approximately $8.49 per $1,000 of assessed value, property tax burden per square foot of land:
| Lot size | 2025 median total assessed | Annual tax @ $8.49/$1,000 | Tax per sq ft of land |
|---|---|---|---|
| 0–1,500 sq ft (Aurora Court tier) | $517,470 | $4,394 | $3.38 |
| 1,500–2,500 (townhouse) | $510,596 | $4,335 | $2.17 |
| 2,500–5,000 | $590,682 | $5,015 | $1.34 |
| 5,000–7,500 (standard city) | $656,620 | $5,575 | $0.89 |
| 15,000+ (large suburban) | $844,295 | $7,168 | $0.32 |
A townhouse lot pays 6.8 times more per square foot of land in annual property tax than a 15,000+ sq ft suburban lot. The city + county + schools + special districts collectively extract more revenue per acre from densely-built parcels — a result of how property tax mathematically combines per-parcel structures with per-sqft land.
3. Land-value growth rate — the "return" differential
Same 5-year window (2020 tax roll → 2025 tax roll), same city, same demand curve:
| Lot size | 2020 median land | 2025 median land | 5-year growth |
|---|---|---|---|
| 0–1,500 sq ft | $61,890 | $174,416 | +182% (2.82×) |
| 1,500–2,500 | $111,402 | $210,090 | +89% (1.89×) |
| 2,500–5,000 | $133,096 | $253,696 | +91% (1.91×) |
| 5,000–7,500 | $145,000 | $269,973 | +86% (1.86×) |
| 15,000+ | $200,000 | $350,900 | +76% (1.76×) |
Tiny lots almost tripled in median land value over 5 years; large lots grew about three-quarters. The 0–1,500 sq ft bucket includes a composition shift from new infill development (Aurora Court Phase 1 + 2 in NE Bellingham added ~30 townhouse lots assessed at $154,066 each), but even the 1,500–2,500 bucket (more stable composition) grew 89% in 5 years vs 76% for large lots — a 13-point spread on five years of compounded growth.
The supply response that ran the wrong way
If the price signal were operating in a supply-elastic market, the dramatic increases above would attract new supply — new small-lot subdivisions, new infill, more product at the size and price the market is bidding for. Bellingham's experience over 2016–2025 inverts that expectation. The boom years saw FEWER new lots created in the standard-residential bucket than the pre-boom years.
| Lot bucket | Pre-boom new lots /yr (2016–20) | Boom new lots /yr (2020–25) | Change |
|---|---|---|---|
| 0–1,500 sq ft (townhouse) | 3.5 | 5.6 | +60% |
| 1,500–2,500 (townhouse) | 3.8 | 9.4 | +147% |
| 2,500–5,000 | 30.5 | 32.2 | +5% |
| 5,000–7,500 (STANDARD) | 29.2 | 12.8 | −56% ↓↓ |
| 7,500–10,000 | 16.2 | 7.6 | −53% ↓↓ |
| 10,000–15,000 | 12.2 | 9.8 | −20% |
| 15,000+ | 12.5 | 9.6 | −23% |
| TOTAL | 108.0 | 87.0 | −19% |
Two patterns sit inside that table. First, new-lot creation in the townhouse buckets (under 2,500 sq ft) rose substantially during the boom — that's the Aurora Court effect, builders responding where current zoning permitted them to deliver density. Second, and the larger absolute story: new-lot creation in standard residential sizes (5,000–10,000 sq ft) fell roughly in half during the period when land values in those same buckets nearly doubled.
In a normal market the largest price increases attract the most new supply. In Bellingham the largest price increases occurred in standard-residential lots, and the supply response to those increases ran the opposite direction. The only place supply DID expand — small townhouse lots — is the niche where current zoning happens to permit density. The implication: somewhere in the standard-residential subdivision pipeline (lot-size minimums, parking minimums, infrastructure-extension requirements, UGA boundary, permit-pipeline cost), there is a binding regulatory constraint that a major price boom couldn't overcome.
Across the entire 9-year window, the city added 905 truly new single-family-residential parcels — roughly 101 per year for a city of ~92,400 residents. About 1.1 new lots per 1,000 residents per year, in a city where land values doubled or tripled over the same window.
Where do these land values come from?
One last methodological note. Closed vacant-land sales in the Bellingham NWMLS area: 152 in 2020, 194 in 2021 (peak), 114 in 2022, 119 in 2023, 83 in 2024, and 80 in 2025 — a 47% decline over five years during the same window when land values nearly doubled. That small and shrinking set of transactions is the data the County Assessor's mass-appraisal model uses to calibrate land-rate tables that then assign values to all 17,609 single-family-residential parcels inside Bellingham city limits. Most existing homeowners' assessed land values are modeled, not market-tested — the "market" portion of the calibration is roughly 80 actual sales per year in a city of 92,400.
This raises a structural question Real Record explores in a separate investigation: The Mass-Appraisal Feedback Loop. The short version: the assessor uses the price effects of the same city/county government's zoning and growth-boundary restrictions as inputs to its valuation model. More restrictive land-use → higher modeled land values → more property-tax revenue → for the same government that set the restrictions. The numbers in this small-lot investigation are the model output. Where those model inputs come from is the subject of the linked piece.
What the buyer experiences
The townhouse buyer on a 1,500–2,500 sq ft lot in 2025 gets, relative to the standard 5,000–7,500 sq ft city lot buyer:
- About one-third the land (2,000 sqft midpoint vs 6,250 sqft midpoint)
- Typically shared or zero-lot-line walls, less privacy
- Smaller or shared driveways — usually one off-street parking space instead of two-plus
- Minimal or no usable yard — the building footprint consumes most of the lot
- Higher density of immediate neighbors
For approximately 78% of the standard city lot's annual tax bill ($4,335/yr vs $5,575/yr).
What the city captures
On a per-square-foot-of-land basis, the city + overlapping districts extract 2.4 times more from the townhouse lot than from the standard city lot, and 6.8 times more than from a 15,000+ sq ft suburban lot. Per acre of land in city limits, denser parcels generate substantially more property-tax revenue.
This is structurally the same finding housing economists make in support of upzoning: cities recoup their infrastructure costs more efficiently from dense parcels than from sparse ones. Real Record's observation: in Bellingham, the structural revenue tilt favors building more small lots — while the supply response (33 new tiny-lot parcels added 2020–2025, almost all from a single development) has not kept up with the land-price signal (+182% in 5 years on the smallest bucket).
The supply-side question
Why doesn't dense supply come online to relieve the per-sqft squeeze? The structural answers are well-documented:
- Minimum-lot-size zoning in most Bellingham residential zones (5,000 sq ft minimum in many R-1 zones).
- Off-street parking requirements that consume a significant fraction of small lots.
- UGA boundary capacity limits — per the Whatcom County 2025 comprehensive-plan compliance finding, Commerce determined the County is non-compliant with housing-element obligations under RCW 36.70A.070(2)(d)(ii).
- Slow annexation pipeline — 15 designated UGAs / 0 City-initiated annexations 2010–2025 per Real Record's GMA investigation.
- Infrastructure-extension cost requirements that make small standard-lot subdivisions uneconomic.
See also: The Mass-Appraisal Feedback Loop, which examines how the same government that imposes these restrictions also collects the tax revenue that flows from the price effects of those restrictions.
Editorial frame
Real Record reports the numbers without taking a position on what the city or county should do about them. Reasonable readers may conclude that:
- The system is structurally unfair to townhouse buyers, who pay near-equivalent tax for materially less land and amenity, OR
- The system correctly reflects the higher per-sqft demand for small in-city lots, and the policy response should be to permit more of them, OR
- The system is recycling its own restrictions back through the assessor's model into a steady tax-revenue increase that doesn't require any legislative vote (see linked investigation), OR
- All three readings are true at once.
The data is unchanged either way. The information is there; you decide.
Connected on Real Record
Public records requests to file
- City of Bellingham Planning & Development: All applications for short-plat / townhouse-overlay / zero-lot-line / cottage-cluster development reviewed and decided since 2015, with disposition (approved / denied / withdrawn) and decision rationale.
- Whatcom County Assessor: Mass-appraisal methodology notes and 2020–2025 land-rate tables used for residential parcels inside Bellingham city limits, broken out by lot-size category.
- City of Bellingham: Off-street-parking-requirement waivers issued 2018–2025 for residential development under 5,000 sqft per unit, with addresses.
- Bellingham Planning Commission & City Council: Minutes / staff reports / public-comment summaries for any agenda item 2020–2025 considering modifications to minimum-lot-size, parking-minimums, or townhouse / cottage-cluster zoning standards.
Discussed in meetings
Methodology & sources
Source: Whatcom County Assessor tax_assessments + tax_parcels tables for the 2016–2025 roll years, filtered to inside-Bellingham-city-limits parcels via tax_area_description LIKE 'BELLINGHAM%' (33,873 parcels), further filtered to single-family residential and zero-lot-line residential (property_use_cd in 1111–1115, 1133), restricted to parcels with positive legal_acreage and positive market_land_val. ~173,500 parcel-years across 10 years.
Lot-size buckets: Computed as legal_acreage × 43,560 sq ft per acre. The 0–1,500 sq ft bucket contains tiny infill townhouses (most notably Aurora Court Phase 1 + 2 in NE Bellingham); count grew from 20 to 53 parcels over the 5-year window, so reported median includes both real price growth and composition shift. Other buckets have larger, more stable samples (1,000+ parcels each in 2025).
Metric choice: Median over mean to reduce sensitivity to outliers (waterfront / luxury / unusual-shape parcels). Land-only (market_land_val) reported separately from improvements (market_improvement_val) to isolate the "dirt under the building" effect from the cost-of-the-building effect.
Tax math: 2025 consolidated levy rate for typical Bellingham TCAs is approximately $8.49 per $1,000 of assessed value (Whatcom County Annual Tax Book 2026); rates vary slightly by TCA due to special-district overlaps. The 78% / 6.8× figures use median total assessed value × uniform rate as illustrative; actual bills for individual parcels vary based on their TCA.