Renew or Re-List? The San Diego Lease Renewal Math for Fall 2026

If you are staring at a San Diego lease renewal that expires this fall, here is the short answer before I show you the math: in the market we are in right now, keeping a good tenant at a modest increase almost always beats pushing to the legal maximum and losing them. Not because it feels nicer. Because the arithmetic is brutal, and most owners have never actually run it.

This one is for San Diego owners and small landlords — the folks with one to four doors who handle renewals themselves and are genuinely trying to do right by a decent tenant without leaving money on the table. I get this call every August and September, and it is almost always framed the same way: “How much can I raise it?” That is the wrong first question.

The market you are actually renewing into

This is not the 2021 rental market and it is not the 2023 one either. According to Kidder Mathews’ Q2 2026 San Diego multifamily report, county vacancy climbed to 5.5% from 4.9% a year earlier, with average asking rents around $2,453 per unit. Rent growth has flattened. Supply has loosened. Tenants have options they did not have two years ago.

That changes the renewal calculus in one specific way: the assumption that a vacant unit re-rents quickly at a higher number is no longer safe. When our crew is turning a unit in Clairemont or North Park right now, we are planning for weeks, not days.

The San Diego lease renewal math, in dollars

Let’s use the county average — a $2,453/month unit with a tenant who pays on time and does not call you at midnight. Three paths:

Scenario	New rent	Vacancy	Turn cost	Your 12-month net
Renew flat	$2,453	0 days	$0	$29,436
Renew at +3%	$2,526	0 days	$0	$30,312
Push to the cap, tenant leaves	$2,654	34 days	$2,500	$26,346

The aggressive option is the worst option by nearly $4,000. And notice that renewing at zero increase still beats it by more than $3,000. That is not a rounding error. That is a full month and a half of rent, gone, in exchange for a bigger number on paper.

To break even on losing a $2,453 tenant, the next one has to pay about $2,939 — roughly a 20% premium. In this market, that number does not exist.

That is the whole argument. Under California’s statewide rent cap, most San Diego rentals cannot legally be raised anywhere near 20% in a year anyway — I walked through the current allowable increase in how much a San Diego landlord can raise rent in 2026. So the maximum legal increase and the break-even increase are not even in the same neighborhood. Which means every renewal where the tenant walks over the rent is, mathematically, a loss you chose.

When you actually should let them go

I am not going to pretend renewal is always right. Here is when we tell an owner to take the turnover:

• The rent is 15%+ below market. If a unit has drifted badly under — common with long-tenured tenants — the gap can eventually justify the reset. Run the numbers, do not eyeball it.
• Payment history is shaky. A tenant who is chronically 10 days late is already costing you; the vacancy math assumes reliable rent, and that assumption is broken.
• The unit needs work you cannot do occupied. If you are going to renovate anyway, stacking the turnover onto the renovation window is efficient rather than wasteful.
• The relationship is genuinely bad. Some things are not a spreadsheet problem, and burnout is real.

Outside of those four, renewal is usually the better business decision — and it gets better the more you have invested in reducing tenant turnover in the first place.

The renewal conversation that works

Timing first: start 90 days out. For a lease ending December 31, that means the conversation happens now, in late August or early September — not the week of Thanksgiving. San Diego’s leasing market slows hard between mid-November and February, and a January vacancy is the most expensive kind.

Then lead with the value, not the number. The renewal offers that get accepted around here look roughly like this: a modest increase, a specific improvement the tenant has actually asked about (a new dishwasher, interior paint, a real fix to the slow drain), and a longer term. Trading a small capital item for another twelve or eighteen months of guaranteed occupancy is one of the highest-return moves a small landlord can make, and it costs a fraction of a turnover.

And if the tenant does leave, do not improvise. The San Diego rent-ready turnover checklist exists precisely because the days you lose are almost never labor — they are calendar.

Frequently asked questions

How much notice do I have to give for a rent increase in San Diego?

Under California law, increases of 10% or less generally require 30 days’ written notice; increases above 10% generally require 90 days. Most San Diego rentals are also subject to the statewide cap under AB 1482, and some properties are exempt. Confirm your property’s status before serving anything.

Should I offer a month-to-month or a new fixed term?

In a softening market, a fixed term is usually worth more to you than the flexibility is. Month-to-month means the tenant can leave in the middle of San Diego’s slowest leasing season. A twelve-month renewal that ends in late spring or early summer puts your next potential vacancy in the strongest window of the year.

What if my tenant asks for a rent reduction?

Run the same math in reverse. If a $100/month reduction keeps a reliable tenant who would otherwise leave, you are trading $1,200 a year against a roughly $5,500 turnover. It is worth taking seriously rather than reflexively refusing — though I would ask for a longer term in exchange.

This article is general information for San Diego property owners, not legal or tax advice. Rent-cap coverage, exemptions, and notice requirements vary by property and by local ordinance — please confirm your specific situation with qualified counsel before serving a notice. Amara Berg, CA DRE #01961620. Big Returns, CA DRE #02322119. Equal Housing Opportunity.