Building Control in Wales: How It Differs From England

SiteKiln gives you plain-English information, not building control or legal advice. If you're unsure whether your work needs building regulations approval in Wales, contact your local authority building control team or a Registered Building Control Approver.

‍‌​‌‌‌‌‌‌‌​​​​‌‌​‌‌‌‌​​‌​‌​‌​‌​‌‍# Building Control in Wales, How It Works and Where It Differs

Wales still has two building control routes, just like England, but the private sector route has changed name and the regulations are slowly drifting apart. If you work cross-border, here's what you need to know.

1. Who does building control in Wales now?

You've got two options for building control on a Welsh job:

Local authority building control

Your council's building control team. Every Welsh local authority has one. They inspect, advise, and issue completion certificates.

Registered Building Control Approvers (RBCAs)

This is the new name for what used to be "approved inspectors." The old Building (Approved Inspectors etc.) Regulations 2010 have been largely revoked in Wales and replaced by the Building (Registered Building Control Approvers etc.) (Wales) Regulations 2024.

From April 2024, private building control in Wales operates through Registered Building Control Approvers and registered individual inspectors, overseen under the Building Safety Act framework.

For you as a contractor, the practical choice is the same as it always was:

• Council building control (via the local authority), or
• A registered private building control approver (RBCA) · appointed by the building owner or developer

Most small domestic jobs in Wales use council building control. Larger developments and commercial work may use an RBCA for speed and flexibility.

2. LABC's role in Wales

LABC (Local Authority Building Control) is the membership body for council building control teams across England and Wales.

In Wales, LABC:

• Supports Welsh local authority building control with standards, training, and technical guidance
• Provides standardised forms and details that most Welsh councils use
• Runs the LABC Warranty scheme and Partner Authority Scheme (where one council can accept inspections from another council's team)

For you: council building control in Wales should feel very similar to England in how they inspect and advise. If you're used to dealing with LABC teams in England, the Welsh experience will be familiar.

Find your local authority building control contacts at labc.co.uk or through the council's own website.

3. How to submit a building regs application in Wales

Same two basic routes as England: Full Plans or Building Notice.

Full Plans application

You prepare detailed drawings, specifications, and structural calculations (where relevant) and submit them to either:

• The local authority building control team, or
• A Registered Building Control Approver you've appointed

They check the plans against the Welsh Building Regulations and either:

• Approve · you can build as drawn
• Approve with conditions · build, but meet specific additional requirements
• Request amendments · the design needs changes before approval

When to use Full Plans:

• Extensions, loft conversions, structural alterations · any work where you want certainty before you start
• Welsh Government guidance recommends Full Plans for most significant building work
• You know the design is compliant before you build, which reduces arguments and rework on site
• The approval is valid for 3 years from the date of deposit

Building Notice

For certain smaller, simpler domestic work, you can submit a Building Notice to the local authority instead of full plans.

• You don't submit detailed drawings upfront · building control inspects as you go and may ask for details or calculations along the way
• Quicker to start · you can begin work once the notice is accepted (usually 48 hours' notice before starting)

Limitations:

• Building Notice cannot be used for most commercial work, work within 3 metres of a public sewer, or some work involving fire safety in flats
• Because there's no formal plan approval, you're more exposed to changes on site if the inspector finds something that doesn't comply · that can mean opening up work you've already done
• You don't get a formal plans approval document · only inspections and eventually a completion certificate

Welsh Government's recommendation: use Full Plans for anything substantial. Building Notice is better suited to simple domestic jobs like a small extension, a boiler replacement, or a new bathroom where the structural work is straightforward.

4. Competent Person Schemes in Wales

Competent Person Schemes are UK-wide · Wales uses the same main schemes as England.

If you're registered with one of these schemes, you can self-certify the relevant work for Building Regulations in Wales, exactly the same as in England. The scheme notifies the local authority on your behalf, and the homeowner gets a certificate.

From a trades point of view: competent person registration works the same on both sides of the border. Just check your scheme's coverage includes Wales, almost all major schemes do, but confirm before you self-certify a Welsh job.

5. Completion certificates and enforcement

Completion certificates

Once work is finished and inspections are passed, the building control body (local authority or RBCA) issues a completion certificate (or final certificate under the RBCA route).

That certificate is crucial for:

• Mortgage lenders · many won't lend without it
• Future property sales · missing completion certificates cause delays and can reduce property value
• Insurance · some policies require evidence that work was done to regulations
• Proving the job was done properly · if a dispute arises later

If competent person schemes are used (e.g., NICEIC for an electrical rewire, FENSA for windows), they provide their own scheme certificates and notify building control separately. These sit alongside the main completion sign-off.

Don't leave site without making sure the completion certificate process is underway. If you walk away and the customer never gets the final inspection, it can come back to you years later when they try to sell.

If work doesn't comply

If building control thinks work doesn't meet the Welsh Building Regulations:

1. They'll ask you to put things right · extra fire protection, bigger beams, additional insulation, corrected drainage, etc.
2. They'll refuse to issue a completion certificate until the work is compliant
3. In serious or ignored cases, local authorities can serve enforcement notices under the Building Act 1984 (as it applies in Wales), requiring alterations or removal of non-compliant work
4. Section 36 of the Building Act allows the local authority to require the removal or alteration of work that contravenes building regulations: they can do this within 12 months of the work being completed (or longer if the work is dangerous)

Ignoring building control in Wales can come back to bite you when the property is sold, when a defect causes injury, or when an insurance claim is rejected because the work wasn't signed off.

6. Welsh-specific building regulation differences

This is the bit that catches cross-border workers.

Historically, Wales used the same Approved Documents as England. Over time, Welsh Government has started to diverge:

• The Building Regulations 2010 apply in both England and Wales, but Welsh Ministers now issue their own versions of Approved Documents and amendments
• Some Parts, particularly energy efficiency (Part L), fire safety (Part B), overheating (Part O), and higher-risk building rules: are being updated on different timetables with Wales-specific requirements
• Wales commenced Schedule 3 of the Flood and Water Management Act 2010 (mandatory SuDS) in 2019 · England hasn't. This affects drainage design.
• Wales is implementing the Building Safety Act 2022 provisions on its own timeline, including the new RBCA regime

The golden rule for cross-border workers

Do not assume the English Approved Documents are identical to the Welsh ones.

When you're working in Wales, always use the Welsh Government's Approved Documents and guidance notes · not the English versions published by DLUHC.

The differences may be small on some Parts, but where they exist (especially on energy, fire, and drainage), using the wrong version can mean non-compliant work.

Where to find the Welsh versions

Welsh Government building regulations page: gov.wales, search "Quick guide to the building regulations" or "building regulations approved documents Wales"

All Welsh Approved Documents, circular letters, and guidance are published there.

7. Practical checklist for working in Wales

What to do next

1. If you're pricing a Welsh job: check whether you need Full Plans or Building Notice · factor in the application fee and inspection timeline
2. Download the Welsh Approved Documents from gov.wales · don't use the English versions
3. Check your Competent Person Scheme covers Wales before self-certifying
4. Contact your local authority building control via labc.co.uk for advice on the application route
5. If the job involves drainage: check whether SAB approval is needed (see our SAB and SuDS guide)

Sources

• Building Act 1984 (as applied in Wales) · legislation.gov.uk/ukpga/1984/55
• Building Regulations 2010 · legislation.gov.uk/uksi/2010/2214
• Building (Registered Building Control Approvers etc.) (Wales) Regulations 2024 · legislation.gov.uk/wsi/2024
• Building Safety Act 2022 · legislation.gov.uk/ukpga/2022/30
• Welsh Government, Quick Guide to the Building Regulations · gov.wales
• Welsh Government, Approved Documents (Wales) · gov.wales
• LABC · labc.co.uk

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