If only they’d known…
Every week, we meet property owners, facilities managers, and school estates teams who thought a flat roof refurbishment would be straightforward. Then the reality hits: Gateway 2 compliance.
They discover – often too late – that their project can’t even start without approvals. Suddenly, costs spiral, deadlines slip, and they’re stuck in red tape.
It doesn’t have to be that way. If you understand the rules upfront, you can plan ahead, get approved, and refurbish with confidence.
So, what is Gateway 2?
Gateway 2 is the pre-construction checkpoint introduced under the Building Safety Act 2022.
Think of it as a regulatory “green light.” Before any work begins, you must prove:
- Your flat roof design complies with Building Regulations (thermal, fire, and moisture control).
- Your system is certified (BBA or equivalent).
- Your drawings show falls, outlets, upstands, and terminations.
- You’ve addressed fire performance and condensation risks.
- The work will be delivered by a competent, accredited contractor.
Without this approval, you may not be allowed to start – and if you do, you risk fines, invalid warranties, and costly remedial works.
The Confusion: 11 m vs 18 m
Here’s where many clients get caught out: the Act has two height triggers.
| Threshold | Definition | Why It Matters | Impact on Refurbishments |
| 11 m / 5 storeys | Relevant Building | Leaseholder protections apply. Landlords can’t simply pass on fire safety or defect costs to leaseholders. | If you own or manage flats over 11 m, you’ll need solid compliance evidence to recover costs. |
| 18 m / 7 storeys | Higher-Risk Building (HRB) | Triggers the full Gateway regime (Gateways 1, 2, and 3). | Residential refurbishments over 18 m must submit a full Gateway 2 pack to the Building Safety Regulator. |
👉 Schools and hospitals under 18 m aren’t classed as HRBs. But if you refurbish more than 50% of the roof, you still trigger Building Regulations (Part L insulation, Part B fire safety, Part C moisture). And public-sector clients almost always expect a Gateway 2-style submission pack.
Why Refurbishments Can’t Cut Corners
With new builds, everything starts fresh. With refurbishments? You inherit decades of hidden problems:
- Rotten decks, sagging joists
- Inadequate insulation
- Non-compliant vapour control
- Poor or missing falls for drainage
Gateway 2 ensures these issues are addressed on paper – before they cause chaos on site. Fixing them early saves money, time, and stress.
How to Start a Gateway 2 Submission
- Roof Survey – intrusive testing, core samples, moisture mapping, deck condition.
- Compliance Pack – drawings, spec, U-values, condensation analysis, fire and drainage evidence.
- Submission – to the Building Safety Regulator (18 m+) or Building Control/Approved Inspector (<18 m).
- Response – answer queries on fire ratings, insulation, or installer competence.
- Approval – the written green light to start work.
What It Costs
- HRBs (18 m+) – £5,000–£15,000 (design team + regulator fees).
- Non-HRBs (<18 m) – £1,000–£3,500 (lower if self-certified through NFRC CPS).
💡 As an NFRC Competent Person Scheme accredited roofer, Vanguard can self-certify compliance for non-HRB projects – cutting out inspection fees and weeks of waiting.
The Bottom Line
If your refurbishment involves replacing more than 50% of a flat roof – or your building is over 11 m – compliance isn’t optional. Gateway 2 (or its Building Control equivalent) will apply.
Handled badly, it’s a minefield. Handled well, it’s your safety net – ensuring your roof is watertight, compliant, and warrantied for decades to come.
That’s why smart clients choose to partner with a contractor who does it all: survey, design, submission, and installation. One team. One system. One guarantee. No finger-pointing.
FAQ: Gateway 2 & Flat Roof Refurbishments
Q: Does Gateway 2 only apply to buildings over 18 m?
No. The 18 m rule applies to “Higher-Risk Buildings” (HRBs) for the full Gateway process. But buildings over 11 m (5 storeys) are classed as “Relevant Buildings,” which triggers leaseholder protections. And even under 18 m, refurbishing more than 50% of a flat roof will bring you under Building Regulations scrutiny.
Q: Do schools and hospitals under 18 m need Gateway 2 approval?
They’re not classed as HRBs, but refurbishments still require Building Control approval. Most public-sector clients demand a Gateway 2-style submission pack before sign-off.
Q: What if I’m just overlaying an old roof?
If the overlay covers more than 50% of the waterproofing over a heated space, you’ll still trigger Building Regulations (Part L insulation upgrades). Competent Person Scheme contractors (like Vanguard) can self-certify compliance.
Q: How long does a Gateway 2 submission take?
- HRBs: 8–12 weeks (formal BSR process).
- Non-HRBs: 2–6 weeks via Building Control.
Q: What happens if my design fails Gateway 2?
You’ll need to amend and resubmit, which can delay your start date by weeks. That’s why early preparation and a compliance-ready spec are essential.
Get Your Roof Gateway 2-Ready
📞 01784 730 640
📧 [email protected]
🌐 Request your free Gateway 2 review