Understanding Rent Trends

Why Fair Market Rents Change Year Over Year

HUD recalculates Fair Market Rents annually using fresh survey data, trend adjustments, and CPI rent components. When an area's FMR rises 8% in a single year, it reflects real changes in the underlying rental market, not an arbitrary administrative decision. Understanding the forces behind these changes turns FMR data from a static number into a diagnostic tool.

FMR trends are the product of five interconnected forces: housing supply, demand pressure, construction economics, local policy, and macroeconomic conditions. Each area's unique mix of these forces determines whether rents rise, fall, or hold steady.

Supply: The Foundation of Rent Trends

Housing supply is the single most important driver of rent trends over the medium term. When new construction keeps pace with population growth and household formation, rents tend to grow slowly or stay flat. When construction falls behind demand, rents accelerate.

The United States has underbuilt housing relative to population growth for most of the past two decades. The National Association of Realtors estimates a national housing shortage of 5-7 million units as of 2024. This deficit varies dramatically by metro, some Sun Belt cities have built aggressively while many coastal metros face severe supply constraints from zoning restrictions, land costs, and permitting delays.

You can see the supply effect in FMR data. Metro areas that permitted the most new multifamily housing relative to population growth, places like Austin, Raleigh, and Phoenix, saw FMR growth moderate or decline in recent years as new units absorbed demand. Meanwhile, supply-constrained markets like San Jose, Boston, and Miami continued to see FMR increases well above the national average.

Check your area's rent trends on our rent growth rankings page. Metros at the top of the list are almost always supply-constrained markets where construction has not kept pace with demand.

Demand: Population, Jobs, and Migration

Demand for rental housing is driven by three forces: population growth (more people need homes), household formation (people forming new households rather than doubling up), and the homeownership rate (when fewer people buy, more people rent).

Population growth has shifted dramatically in the post-pandemic era. Remote work enabled millions of workers to relocate from expensive coastal metros to lower-cost cities in the South and Mountain West. This migration wave drove explosive FMR growth in places like Boise, Nashville, Tampa, and Charlotte, areas that gained population rapidly while their housing stock could not expand fast enough.

Simultaneously, some traditional destination cities like San Francisco and New York saw FMR growth slow or briefly reverse as out-migration reduced demand pressure. By 2024-2025, many of these markets stabilized as return-to-office mandates and continued in-migration restored demand.

Job market strength is the other critical demand factor. Metro areas with strong employment growth, particularly in high-wage sectors like technology, healthcare, and professional services, attract workers who compete for housing. The relationship between employment growth and FMR growth is consistently strong across metro areas.

Construction Costs and the Supply Response

Even in areas where demand is strong and zoning permits new construction, the cost of building determines how quickly and how much new supply appears. Construction costs have risen substantially since 2020, driven by lumber prices, labor shortages in the skilled trades, higher interest rates for development loans, and supply chain disruptions for materials like electrical equipment and HVAC systems.

Higher construction costs affect rents in two ways. First, they slow the rate of new construction by making marginal projects financially unviable. A project that pencils out at $250,000 per unit may not work at $350,000 per unit, especially with higher interest rates. Less construction means less supply relief and continued rent pressure.

Second, higher construction costs raise the "floor" for rents in new buildings. Developers must charge rents high enough to cover their costs and earn a return. When new apartments lease at $1,800/month, that sets a benchmark that pulls up rents in older buildings as well. Older buildings that previously rented at $1,200 may renovate and re-lease at $1,500, knowing they are still well below the new-construction price point.

Local Policy and Regulation

Local government policies affect rent trends through multiple channels. Zoning laws determine what can be built and where. Permitting processes determine how quickly it can be built. Building codes affect construction costs. Rent control policies directly cap how fast rents can rise for covered units.

Restrictive zoning, single-family-only zones, height limits, minimum lot sizes, parking requirements, is the most powerful policy constraint on housing supply. Research consistently shows that metro areas with more restrictive land-use regulations have higher housing costs and slower supply response to demand increases. California, Massachusetts, and the New York metro area are prime examples.

Recent zoning reforms in states like Oregon, California, and Minnesota (allowing duplexes, reducing parking mandates, streamlining approvals) are designed to ease supply constraints. However, these reforms take years to translate into completed housing units and measurable FMR effects. The impact on FMR trends may not be visible for 3-5 years after implementation.

Macroeconomic Conditions: Interest Rates and Inflation

The broader economy affects rent trends in several ways. Interest rates are the most direct channel. When mortgage rates rise sharply, as they did from 3% to 7%+ between 2022 and 2024, many potential homebuyers are priced out and remain renters. This "lock-in effect" increases rental demand and puts upward pressure on FMRs even without population growth.

Conversely, periods of low interest rates and easy lending historically reduce rental demand as more households transition to homeownership. The 2010s, with mortgage rates below 4% for extended periods, saw homeownership rates recover from post-recession lows, which would have moderated FMR growth if not for simultaneous supply constraints.

General inflation also matters. When wages, materials, and operating costs all rise, landlords raise rents to maintain margins. The 2021-2023 inflation surge contributed to FMR increases across the country. Even in markets with stable demand, cost-push inflation drove rents higher as landlords passed through increased property tax, insurance, and maintenance costs.

Reading FMR Trends on PlainRent

PlainRent displays FMR data at the county and metro level, including year-over-year changes. Here is how to use this data effectively:

Compare to the national trend. If the national average FMR increased 5% and your county increased 3%, your area is getting relatively more affordable even though rents are still rising. Context matters, a 7% increase in a year when the national average was 5% tells a different story than 7% when the average was 2%.

Look at the bedroom breakdown. FMR trends can differ by unit size. In some markets, studio and one-bedroom FMRs are rising fastest as young professionals and small households drive demand. In others, three-bedroom and four-bedroom FMRs are climbing as families who cannot afford to buy homes compete for larger rentals.

Check the state context. Visit the rent growth rankings to see where your area falls relative to peers. Our guide on the cheapest states to rent provides a broader geographic view of rental affordability.

Factor in the FMR lag. Remember that FMR data reflects market conditions from approximately 1-2 years prior, adjusted forward with trend factors. If your area has experienced a major employer opening or closing, or a large housing development completing since the data reference period, current conditions may already differ from published FMRs. Use FMR trends to understand structural direction, not to price an apartment today.

What Rent Trends Mean for Different Audiences

Renters. Rising FMRs in your area signal a tightening market. If your lease renewal is approaching, expect upward pressure. If FMRs are flat or declining, you have more negotiating leverage. Use county-level FMR data from PlainRent to benchmark whether your landlord's proposed increase is in line with the market or above it.

Voucher holders. FMR increases directly benefit voucher holders because they raise the payment standard, the maximum subsidy available. However, in markets where actual rents are rising even faster than FMRs, the gap between the FMR and market rents may still widen. Our Section 8 guide covers how FMR changes affect voucher purchasing power.

Policymakers and advocates. FMR trend data is valuable evidence for housing policy discussions. Rapidly rising FMRs signal supply shortage and affordability pressure. Declining FMRs may signal population loss or economic distress. Both demand different policy responses.

Investors and landlords. FMR trends are a lagged but reliable indicator of rental market direction. Areas with consistently above-average FMR growth have structural demand that supports rental income growth. Areas with flat or declining FMRs may face softening demand or oversupply.

Frequently Asked Questions

Why did my area's FMR increase so much this year?

Large FMR increases typically reflect a combination of factors: strong population growth or in-migration that increased demand, insufficient new construction to keep pace, rising construction and materials costs passed through to rents, and ACS survey data capturing market conditions from 1-2 years prior. In areas where rents surged during 2021-2023, FMR data is still catching up to those increases.

Can Fair Market Rents decrease from one year to the next?

Yes, but it is uncommon. FMR decreases occur when rental markets soften due to population outflow, a surge of new construction hitting the market, or economic downturns that reduce demand. Some metro areas in the Midwest and Northeast have experienced flat or declining FMRs in years when population declined. HUD also has a policy of limiting year-over-year FMR decreases to protect voucher holders.

How do FMR trends differ from CPI rent inflation?

CPI shelter inflation measures the change in rents paid by all tenants, including those in existing leases that may not have adjusted yet. FMRs are based on the full distribution of current gross rents for standard-quality units. CPI tends to lag actual market conditions even more than FMR because it includes tenants on multi-year leases paying below-market rates.

Do rent control laws affect FMR trends?

Rent control can suppress FMR growth in areas where a significant share of the housing stock is subject to price controls, because controlled units pull down the overall rent distribution. However, the effect depends on the stringency and coverage of the controls. In cities where only a portion of units are rent-stabilized, market-rate units still drive FMR trends.

How can I track FMR trends for my county or metro area?

PlainRent displays year-over-year FMR changes on county and metro pages. You can also visit the rent growth rankings page to see which areas have the fastest-rising and fastest-falling FMRs nationally. For historical data going back multiple years, HUD publishes a complete FMR archive on its website.