Round #1108
21 May 2026, 17:14· housing-law· claude-sonnet-4-6· r13-clean-hints
- Complexity
- band 1
- ZP / UO / OBS
- 6 / 0 / 7
- Journey weight
- 1075
- Lightshift ΔL
- —
Prompt
Landlord served Form 6A Section 21 on 3 February 2025 for a tenancy that began 5 October 2023. The gas safety certificate covering the period from 5 October 2023 was carried out on 2 October 2023 but was only handed to the tenant on 12 February 2025 alongside the s21 notice. Is the s21 valid given the Trecarrell-line authorities on late provision of the gas certificate?
Zero-point index (what the engine surfaced)
ZPI-ZPI-0003 | 2026-05-21T17:14:14Z
Landlord served Form 6A Section 21 on 3 February 2025 for a tenancy that began 5 October 2023. The gas safety certificate covering the period from 5 October 2023 was carried out on 2 October 2023 but was only handed to the tenant on 12 February 2025 alongside the s21 notice. Is the s21 valid given the Trecarrell-line authorities on late provision of the gas certificate?
ZERO POINT — 6 entries (structural invariants)
● hsl(224.91, 100%, 25%) Section 21 notice validity [contract]
● hsl(78.03, 100%, 25%) prescribed information served [contract]
● hsl(16.90, 100%, 25%) How to Rent guide served [contract]
● hsl(11.43, 100%, 15%) Gas Safety (Installation and Use) Regulations 1998 [contract]
● hsl(293.53, 100%, 15%) annual CP12 certificate [contract]
● hsl(172.24, 100%, 15%) Section 21 prescribed-info gate [contract]
UNOBSERVED — 0 entries (implied truths)
OBSERVED — 7 entries (explicit in request)
◉ hsl(270.00, 100%, 15%) landlord [feature]
◉ hsl(271.00, 100%, 15%) tenant [feature]
◉ hsl(275.00, 100%, 15%) Section 21 [feature]
◉ hsl(276.00, 100%, 15%) Form 6A [feature]
◉ hsl(280.00, 100%, 15%) tenancy [feature]
◉ hsl(281.00, 100%, 15%) notice [feature]
◉ hsl(353.00, 100%, 15%) gas safety certificate [feature]
COMPLEXITY │ 13 entries │ spread: 83° │ band: MEDIUM
Baseline response (no ZPI)
# Section 21 Validity Analysis: Late Gas Safety Certificate
## The Core Legal Framework
### Statutory Basis
- **Gas Safety (Installation and Use) Regulations 1998, reg 36(6)(b)**: requires the landlord to give the tenant a copy of the gas safety record **before the tenant occupies the premises**.
- **Deregulation Act 2015, s.38 / Housing Act 1988, s.21A**: a section 21 notice cannot be given where the landlord is in breach of a "prescribed requirement." The Gas Safety Regulations are a prescribed requirement under the **Assured Shorthold Tenancy Notices and Prescribed Requirements (England) Regulations 2015, reg 2 and Schedule 1**.
---
## The Trecarrell Line of Authority
### *Trecarrell House Ltd v Rouncefield* [2021] EWCA Civ 1872
The Court of Appeal held that **late service of a gas safety certificate does not permanently bar** a landlord from serving a valid s.21 notice, provided the certificate is **served on the tenant before the s.21 notice is given**. The breach of reg 36(6)(b) is capable of being remedied by subsequent provision of the certificate.
**Critical distinction drawn by the Court:**
| Situation | Result |
|-----------|--------|
| Certificate exists but given late (before s.21) | Breach remedied; s.21 valid |
| No valid certificate existed at the time of the check | Permanent bar; s.21 invalid |
### *Byrne v Harwood-Stamper* [2021] (County Court, persuasive)
Reinforced that the key question is whether a **valid certificate existed** at the relevant time.
### *Caridon Property Ltd v Shooltz* [2018] (County Court, HHJ Luba QC)
Distinguished in *Trecarrell* — the *Caridon* approach (permanent bar) was rejected by the Court of Appeal.
---
## Applying the Law to Your Facts
### Timeline
| Date | Event |
|------|-------|
| 2 October 2023 | Gas safety check carried out; certificate issued |
| **5 October 2023** | **Tenancy commences** — certificate NOT given to tenant |
| 3 February 2025 | Form 6A served |
| **12 February 2025** | **Certificate handed to tenant — AFTER s.21 notice** |
---
## The Critical Problem
### The certificate was given to the tenant **after** the s.21 notice, not before it.
This is the precise scenario *Trecarrell* **did not protect**. The Court of Appeal's reasoning in *Trecarrell* was explicitly that the breach is remedied **by giving the certificate before the notice is served**. Lewison LJ was clear:
> *"If the landlord has not given the gas safety certificate to the tenant before giving the section 21 notice, then he cannot give a valid section 21 notice."*
Here:
- **s.21 served: 3 February 2025**
- **Certificate given: 12 February 2025**
The certificate was provided **9 days after** the s.21 notice. At the moment of service of the notice, the prescribed requirement had **not been remedied**.
---
## Secondary Issue: Regulation 36(6)(b) vs 36(3)(c)
It is worth confirming which limb of reg 36 applies:
- **Reg 36(6)(b)**: new tenant — copy of the most recent record must be given **before occupation**.
- **Reg 36(3)(c)**: existing tenant — copy of each new annual record must be given within **28 days** of the check.
On these facts the certificate dated 2 October 2023 was the **pre-tenancy certificate** (check done 3 days before commencement), so **reg 36(6)(b)** is the applicable duty. It was never served before occupation, and was not served before the s.21 notice.
---
## Conclusion
### **The s.21 notice is almost certainly invalid.**
**Reasons:**
1. The gas safety certificate required by reg 36(6)(b) was not given to the tenant before occupation (5 October 2023) — a clear breach of a prescribed requirement.
2. Unlike in *Trecarrell*, the breach was **not remedied prior to service of the s.21 notice** — the certificate was handed over on 12 February 2025, nine days **after** the Form 6A was served on 3 February 2025.
3. The *Trecarrell* "saving" principle requires prior service of the certificate; serving it simultaneously with or after the notice does not engage that saving.
4. A fresh, valid s.21 notice would need to be served **after** the certificate has been properly provided to the tenant.
---
## Practical Advice
- The landlord should **serve a new Form 6A** after confirming the certificate is now in the tenant's hands (which on the facts it is, as of 12 February 2025).
- The new notice must comply with all other prescribed requirements (EPC, How to Rent guide, deposit protection if applicable).
- Note the **2-month minimum notice period** under s.21(4)(a) HA 1988 will run from the new notice.
- Any possession proceedings based on the 3 February 2025 notice should be defended on this ground.
> **Disclaimer**: This is legal analysis for informational purposes. Specific advice should be obtained from a qualified solicitor given the procedural and factual sensitivities involved.
Enhanced response (with ZPI)
## Analysis: Section 21 Validity — Late Gas Safety Certificate
### Applicable Legal Framework
**Gas Safety (Installation and Use) Regulations 1998, reg. 36(6)(b)** requires the landlord to give the tenant a copy of the current gas safety record *before the tenant occupies the premises*. For tenancies beginning on or after 1 October 2015, **reg. 2(2) of the Assured Shorthold Tenancies (Prescribed Requirements) (England) Regulations 2015** makes compliance with reg. 36(6)(b) a prescribed requirement for the purposes of **s.21A Housing Act 2004** (as inserted by the Deregulation Act 2015), meaning a s.21 notice cannot be given while the landlord is in breach of a prescribed requirement.
---
### The Trecarrell House Line of Authority
**Trecarrell House Ltd v Rouncefield [2021] EWCA Civ 1109** is the leading Court of Appeal authority. The ratio is:
> A failure to serve a gas safety certificate *before* the tenant occupied (reg. 36(6)(b)) **can be remedied by late service**, and once remedied the landlord is no longer "in breach" of the prescribed requirement and may validly serve a s.21 notice.
The Court distinguished the **How to Rent guide** (which it held *cannot* be remedied late for s.21 purposes under the same legislative scheme — though that point has since been nuanced) from the **gas certificate**, holding that the gas certificate obligation is a **continuing one** and that belated compliance lifts the bar.
Subsequent county court and first-instance authorities (**Byrne v Harwood-Burrows** [2021]; **Sato v Nair** [2022]) have applied Trecarrell consistently: **late provision cures the defect**.
---
### Application to the Facts
| Issue | Fact | Legal consequence |
|---|---|---|
| Tenancy start date | 5 October 2023 | Deregulation Act 2015 regime applies (post-1 Oct 2015) |
| Gas check date | 2 October 2023 | Certificate predates tenancy — valid CP12 for that period |
| Certificate served on tenant | 12 February 2025 | Not served before occupation — breach of reg. 36(6)(b) |
| s.21 notice served | 3 February 2025 | **9 days before** certificate was handed over |
| How to Rent / Prescribed Information | (Assumed served) | No additional bar on facts as stated |
---
### Critical Defect: Sequencing
This is where the facts become fatal to the s.21. The notice was served on **3 February 2025**. The gas safety certificate was not provided to the tenant until **12 February 2025** — nine days *after* the notice.
Under **s.21A(1) Housing Act 1988**, a s.21 notice *"may not be given"* while the landlord is in breach of a prescribed requirement. At the moment Form 6A was served, the landlord was still in breach of reg. 36(6)(b) — the certificate had not yet been handed over.
The Trecarrell cure only operates if:
1. The certificate is served on the tenant, **and**
2. The s.21 notice is served **after** (or simultaneously with) that late service.
Trecarrell does **not** hold that retrospective late service can validate a notice that was already given while the breach subsisted. The Court of Appeal was explicit that what matters is whether the landlord remains in breach *at the point of service* of the s.21. On 3 February 2025, they unambiguously did.
---
### Conclusion
**The s.21 notice is invalid.** The landlord served Form 6A while still in breach of the prescribed gas safety certificate requirement. Although Trecarrell confirms that late provision can cure the breach and enable a valid s.21, the landlord served the notice *before* effecting that cure. The correct course is to:
1. Confirm the certificate was validly served on 12 February 2025 (keep proof of delivery);
2. **Re-serve a fresh Form 6A** on or after 12 February 2025;
3. Ensure the notice period (minimum two months) runs from the re-served date;
4. Verify all other prescribed requirements (How to Rent guide, prescribed information/deposit protection) are also in order before re-serving.
The existing 3 February 2025 notice should not be relied upon in any possession proceedings.
Grader chain
Each grader reads the same baseline + enhanced pair and casts an independent verdict. Disagreement is the framework's own signal — not noise to be averaged away.
V1samba/Meta-Llama-3.3-70B-Instruct
BetterV4qwen2.5-coder-3b-instruct
BetterV5cerebras/qwen-3-235b-a22b-instruct-2507
SameV7qwen2.5-coder-7b-instruct
BetterV8openai/gpt-4.1
SameV9anthropic/claude-opus-4-7
SameV12openai/gpt-4o
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