Resources · Section 13(3B)
The 53-Week Rule: Why Your Section 13 Date Calculation Can Be Wrong Even When It Looks Right
- Section 13(3B) of the Housing Act 1988 requires landlords to wait 53 weeks between increases in specific circumstances, instead of the standard 52.
- The rule applies when years of consecutive 52-week increases have drifted your increase date more than six days before the anniversary of the first increase you ever made on that tenancy.
- Most landlords this catches have had the same tenancy for five or more years and have taken the minimum 52-week window each time.
- When the rule applies, a notice issued at 52 weeks is void. The correct date is one week later.
The 53-week rule isn't a rule. It's a quirk of how section 13 dates the period before the next valid increase. Get it wrong and your notice fails. Most landlords who encounter it have been doing the right thing for years: taking the minimum 52-week window, serving on time, calculating correctly. Then the calculation tips past a threshold set in statute and the date they use is one week early.
What the 53-Week Rule Actually Is
Section 13(3A) Housing Act 1988 sets out the standard rule: you must wait 52 weeks from the date the last increase took effect before the next increase can take effect. That is the baseline every landlord knows.
Section 13(3B) is the exception. It applies when two conditions are both met. First: the tenancy has had at least one increase since the Regulatory Reform (Assured Periodic Tenancies)(Rent Increases) Order 2003 came into force. Second: the 53rd week after the date of the last increase begins more than six days before the anniversary of the date of the first ever increase on that tenancy.
When both conditions are satisfied, the relevant date shifts from 52 weeks to 53 weeks. The landlord's earliest valid effective date for the next increase is 53 weeks after the last one, not 52.
Why 52 Weeks Is Not Always 12 Months
A calendar year is 365 or 366 days. Fifty-two weeks is exactly 364 days. The gap is one or two days per year, depending on whether a leap year falls in the cycle.
For a landlord who increases rent annually at the minimum 52-week interval, that gap accumulates. Each year, the increase date arrives one day earlier than the calendar anniversary of the first increase. After five non-leap years, the drift is five days. After a cycle that includes a leap year, that year's drift is two days instead of one.
When the accumulated drift exceeds six days, section 13(3B) activates for the next increase. Instead of catching up gradually to the calendar anniversary, the statute forces a reset: you wait 53 weeks, which lands on or very close to the original anniversary date.
Section 13(3B) Housing Act 1988: The Exact Wording
The subsection applies where:
“(a) the rent under the tenancy has been increased by virtue of a notice under this section or a determination under section 14 below on at least one occasion after the coming into force of the Regulatory Reform (Assured Periodic Tenancies)(Rent Increases) Order 2003; and (b) the fifty-third week after the date on which the last such increase took effect begins more than six days before the anniversary of the date on which the first such increase took effect.”
Two points worth highlighting. First, “the first such increase” means the first increase ever on that tenancy under section 13. The anniversary is a fixed reference point that does not reset with each new increase. Second, the test is whether the 53rd week beginsmore than six days early, not whether the 52nd week ends early. The 53rd week begins 52 weeks after the last increase. So the test is: does the 52-week date land more than six days before the first increase's anniversary?
The Two-Step Calculation That Catches You Out
Step one: take the date of the last increase and count 52 weeks forward. That gives you the date the 53rd week begins.
Step two: find the anniversary of the first ever increase on this tenancy that falls in the same calendar period. Count the gap between the date from step one and that anniversary.
If the gap is six days or fewer, use 52 weeks. Standard rule. If the gap is seven or more days, use 53 weeks. Section 13(3B) applies.
The mistake most landlords make: they do step one and stop. They find the 52-week date, check it is a valid rent day, put it in the notice. They do not do step two. The notice is void.
A Worked Example: Weekly Tenancy, First Increase 6 January 2020
Take a weekly tenancy on a Monday. The landlord first increased rent on Monday 6 January 2020. In each subsequent year, the landlord served notice for the minimum 52-week effective date. Here is what that looks like:
| Year | Effective date | Basis |
|---|---|---|
| 2020 | 6 January 2020 | First increase |
| 2021 | 4 January 2021 | 52 weeks after 6 Jan 2020 (leap year: 364 days) |
| 2022 | 3 January 2022 | 52 weeks after 4 Jan 2021 |
| 2023 | 2 January 2023 | 52 weeks after 3 Jan 2022 |
| 2024 | 1 January 2024 | 52 weeks after 2 Jan 2023 |
Each year, the date drifts one day earlier because 52 weeks (364 days) is one day shorter than a non-leap year (365 days). By the 2024 increase, the date has drifted five days earlier relative to the original 6 January anniversary.
Now for the 2025 increase. The landlord calculates: 52 weeks after 1 January 2024. Because 2024 is a leap year (366 days), 364 days after 1 January 2024 lands on 30 December 2024. That is the date the landlord puts in the notice.
Applying the section 13(3B) test: the 53rd week begins on 30 December 2024. The anniversary of the first increase (6 January 2020) falls on 6 January 2025. The gap is 7 days. 7 is more than 6. Section 13(3B) applies.
The correct effective date is not 30 December 2024. It is 53 weeks after 1 January 2024, which is 6 January 2025. Exactly the anniversary of the first increase. A notice served for 30 December 2024 is void. One week too early.
The landlord counts forward 52 weeks, confirms it lands on a valid rent day, and serves. Correct process. Wrong result.
The second check, step two, is the one that catches you. If you have had the same tenancy for five or more years and have taken the minimum window each year, there is a meaningful probability that section 13(3B) now applies to your next increase. The drift accumulates silently. The form does not warn you. The legislation is not stamped on Form 4A.
Noticr's calculator performs both checks automatically. It knows your first increase date, your last increase date, and the anniversary. You do not have to do the calendar arithmetic.
How Tribunals Have Ruled in 53-Week Disputes
The 53-week mechanism is not widely litigated because it requires a specific combination of facts: a long-running tenancy, a landlord who takes the minimum window each year, and a calendar configuration that tips the accumulated drift past six days.
When challenged, tribunals apply the statutory test mechanically. The date is either valid or it is not. There is no discretion to overlook a void effective date because the landlord calculated in good faith. The notice fails and the landlord must serve a fresh one.
The consequence is typically a delay of seven days before a valid effective date, plus the fresh notice period. In practice, a valid increase takes effect several weeks later than the landlord planned.
What to Do If You Have Already Served a Notice with the Wrong Date
Check the calculation now. Find the date of the first ever rent increase on this tenancy. Note the anniversary that falls after the last increase date. Count 52 weeks from the last increase. Compare the gap.
If the gap is seven or more days, your notice is void. Serve a fresh notice with the correct effective date: 53 weeks from the last increase, falling on a valid rent day. Do not assume the existing notice can be corrected or that the tenant will not notice.
If the gap is six days or fewer, your existing notice is valid. No action required.
Noticr's calculator catches this automaticallyRelated guides
Frequently Asked Questions
Why is there a 53-week rule?
Section 13(3B) Housing Act 1988 prevents landlords from using the 52-week minimum to gradually bring their annual increase date earlier each year. Without it, a landlord who always takes the minimum window would find their increase date drifting progressively earlier, effectively allowing increases at less than a full calendar year cycle. The rule forces a reset to the anniversary of the first increase when the drift exceeds six days.
Does the 53-week rule apply to monthly tenancies?
The 53-week rule applies to all periodic assured tenancies, not just weekly ones. However, for monthly tenancies where the landlord increases rent on the calendar anniversary each year, the accumulated drift typically does not occur because 12 months is always longer than 52 weeks. The rule most commonly affects landlords who take the minimum 52-week window repeatedly across multiple years on the same tenancy.
How do I know if my notice falls in a 53-week situation?
Two checks. Find the date of the first ever Section 13 increase on the tenancy and note its annual anniversary. Then count 52 weeks from the date of your most recent increase. If the 52-week date falls more than six days before the anniversary, you are in a 53-week situation and must use 53 weeks instead. If the gap is six days or fewer, the standard 52-week rule applies.
What happens if I serve a notice 52 weeks after the last increase when the 53-week rule applies?
The notice is void. The effective date you specified is not a valid effective date under section 13. Your tenant does not owe the increased rent. You must serve a fresh notice with the correct effective date (53 weeks from the last increase, on a valid rent day) and wait the full minimum notice period again.
Can the tribunal forgive a 53-week date error?
No. The tribunal applies the statutory test mechanically. A void effective date is void regardless of how the error arose. There is no equitable discretion to validate a notice that fails the section 13 date requirements. The landlord's only remedy is a fresh, correctly dated notice.