When Do I Need Building Control Sign-Off? A Tradesperson's Guide

Summary

Building Regulations set minimum standards for the design, construction, and alteration of buildings in England and Wales, governed by the Building Act 1984 and the Building Regulations 2010. Building control is the process by which compliance is checked, either by a local authority building control (LABC) team or, since April 2024, a registered building control approver (private sector). Not every job triggers a building control application: some work is exempt under Schedule 2 of the Regulations, and certain types of work can be self-certified through competent person schemes without a separate application. However, if controlled work is carried out without approval and without self-certification, the homeowner risks enforcement action, difficulty selling the property, and costly retrospective regularisation. As a tradesperson, knowing which route applies to each job lets you advise customers confidently and avoid compliance problems down the line.

Key Facts

• The Building Regulations 2010 (as amended) define what work is "controlled" and therefore needs approval in England. Wales has its own parallel regulations.
• Since 6 April 2024, all private-sector building control firms in England must be registered with the Building Safety Regulator (BSR).
• There are two application routes: a building notice (no detailed plans, domestic work only, 48-hour start notice) and a full plans application (detailed drawings checked before work begins).
• Competent person schemes let registered installers self-certify specific types of work (e.g. gas, electrics, glazing, heating) without a separate building control application. The installer notifies the local authority within 30 days, and a compliance certificate is issued.
• Work that is exempt under the Regulations (e.g. small detached buildings under 30 m², certain porches, like-for-like repairs) does not need any building control involvement.
• A completion certificate is issued by building control once all inspections are passed and fees are paid. This is the document solicitors look for when a property is sold.
• If work was done without approval, the homeowner can apply for a regularisation certificate retrospectively (for work carried out after 11 November 1985), but this is more expensive and may require opening up completed work for inspection.
• Building Regulations approval is separate from planning permission. You may need one, both, or neither depending on the job.

Quick Reference: Does This Work Need Building Control?

Notes on the table:

• "Like-for-like" means replacing fittings in the same position with no changes to drainage, structure, or electrical circuits.
• Self-certification means the installer (not the customer) must be a member of the relevant competent person scheme and must notify the local authority within 30 days.
• Even exempt work must still comply with Building Regulations if it falls under them -- it simply does not need a formal application.

Detailed Guidance

Do I need building control for a bathroom refit?

A straightforward bathroom refit -- replacing the bath, basin, WC, and tiles in the same positions -- does not normally require building control approval. The tipping points are:

• Drainage changes: Moving the WC to a new position, adding a new soil pipe run, or connecting new waste pipes to the drainage system is controlled work and requires building control.
• Electrical work: Any new electrical circuits or alterations to existing circuits within bathroom zones (the space surrounding baths and showers, as defined in BS 7671) are notifiable under Part P. This includes adding a new extractor fan on a new circuit or fitting a new shower circuit.
• Structural changes: Removing a wall to enlarge a bathroom, or creating a new bathroom in a room that was not previously a wet room, triggers building control for structural stability, ventilation, drainage, and moisture protection.
• Ventilation: A new bathroom without an openable window must have mechanical extract ventilation (minimum 15 l/s intermittent or 8 l/s continuous for a bathroom).

Bottom line for customers: "If we're swapping out your existing suite in the same layout, no building control needed. If we're moving the WC, adding a shower where there wasn't one, or doing any rewiring, we'll need sign-off."

Do I need building control for a boiler replacement?

Yes, a boiler replacement is controlled work under the Building Regulations (primarily Part J -- combustion appliances, and Part L -- energy efficiency). However, most tradespeople handle this through self-certification:

• Gas boilers: A Gas Safe registered engineer installs the boiler and notifies Gas Safe within 30 days. Gas Safe then notifies the local authority, and a Building Regulations Compliance Certificate is posted to the property within 10-15 working days. No separate building control application is needed.
• Oil boilers: An OFTEC-registered technician follows the same self-certification process.
• LPG boilers: Gas Safe registration also covers LPG installations.

If the installer is not a member of a competent person scheme, the homeowner must submit a building notice to the local authority before work starts and pay the relevant fee. A building control inspector will then need to inspect the installation.

When a full plans application is needed: Rarely for a boiler swap. It may be required if the flue route involves significant structural changes, or if the boiler is being relocated to a position that requires new gas pipework routing through unusual locations.

Key compliance points: The new boiler must meet current Part L efficiency requirements (typically 92%+ ErP rating). The flue position must meet the distances in Approved Document J (clearances from openable windows, boundaries, and air bricks).

Do I need building control for a kitchen refit?

A straightforward kitchen refit -- new units, worktops, and appliances in the same layout -- does not require building control approval. Building control is triggered when:

• Structural alterations: Removing a wall between kitchen and dining room to create an open-plan space requires building control. If the wall is load-bearing, you will need structural calculations and an RSJ or steel beam. Even non-load-bearing stud walls may have fire-resistance implications (e.g. in a terraced house with a party wall).
• Electrical work: A new circuit (e.g. a cooker circuit, additional ring main) is notifiable under Part P. Adding a spur to an existing circuit outside a special location is not notifiable. Since April 2013, kitchens are no longer classified as special locations for Part P purposes, so minor electrical additions to existing circuits do not require notification.
• Drainage: Relocating the sink or adding a dishwasher/washing machine waste to a new drainage point is controlled work.
• Ventilation: If you are blocking up an existing window (e.g. to fit tall units), you must ensure the kitchen still has adequate ventilation. An extractor fan providing 30 l/s (intermittent) or 13 l/s (continuous) adjacent to the hob is required.

What's the difference between a building notice and a full plans application?

These are the two routes for submitting a building control application to your local authority.

Building Notice

• Submit a form and fee -- no detailed plans required.
• Can only be used for domestic (residential) work, and cannot be used for work to a building fronting a public sewer or for work that requires a fire safety order.
• Work can start 48 hours after submission.
• No formal plan approval -- compliance is checked on site during inspections.
• If the inspector finds non-compliant work, you may need to redo it at your cost.
• Best for: Smaller domestic projects where the builder is experienced and confident of compliance (e.g. a straightforward extension, garage conversion, structural opening).

Full Plans Application

• Submit detailed architectural and structural drawings with the application and fee.
• The local authority has 5 weeks (extendable to 8 weeks with your agreement) to check the plans and either approve, conditionally approve, or reject them.
• Once approved, you have certainty that your design complies before construction starts.
• The approval notice is a legal document that confirms compliance with the Regulations at the design stage.
• Best for: Larger or complex projects, commercial work, work near public sewers, or when the customer wants certainty before construction starts. Essential for loft conversions, major structural work, and anything where design changes on site would be expensive.

Costs: The total fees charged by the local authority are typically the same for both routes. However, a building notice avoids the cost of preparing detailed plans upfront, while a full plans application avoids the risk of costly rework if something is not right. Most local authorities publish their fee schedules online. Typical charges range from around 150-400 GBP for small domestic work (e.g. a single structural opening) to 800-1,500+ GBP for extensions and loft conversions.

Private building control (registered building control approvers): Since October 2023, you can also use a registered private-sector building control approver for most domestic work. They set their own fees and often offer a more responsive service. They carry out the same inspections and issue the same completion certificate.

What happens if I do work without building control approval?

This is a serious issue that tradespeople need to understand, both for their own liability and to advise customers properly.

Enforcement: Under Section 36 of the Building Act 1984, the local authority can serve an enforcement notice requiring the removal or alteration of work that contravenes the Regulations. In extreme cases, they can seek a magistrates' court injunction or High Court order for demolition. Prosecution is also possible, though in practice this is rare for domestic work.

Time limit for enforcement: The local authority must take enforcement action within 12 months of the work being completed (Section 36). After 12 months, they cannot require removal, but the work still does not have a compliance certificate.

Selling the property: This is where it most commonly causes problems. When a property is sold, the buyer's solicitor will ask for completion certificates for any building work. Missing certificates can delay or derail a sale. The options are:

1. Regularisation certificate: Apply to the local authority to have the work assessed retrospectively. Available for work carried out after 11 November 1985. The fee is typically higher than the original application would have been (often 1.5x to 2x). Building control may require you to open up finished work (e.g. expose steels, insulation, drainage) for inspection. If the work does not comply, you must carry out remedial work before a certificate is issued.
2. Indemnity insurance: A quicker, cheaper option (20-300 GBP) that covers the buyer against the financial risk of the local authority taking enforcement action. This does not confirm the work is safe or compliant -- it only covers the financial loss. Many solicitors accept this for older work, but it is not a substitute for a proper certificate.
3. Do nothing: The buyer may negotiate a price reduction, or the sale may fall through.

Your liability as a tradesperson: If you carry out controlled work and fail to notify building control (and are not self-certifying through a competent person scheme), you could face enforcement action, reputational damage, and potential civil liability if the work later causes harm.

Frequently Asked Questions

Can I start work before building control approves my plans?

With a building notice, yes -- you can start 48 hours after submitting the notice and fee. With a full plans application, technically you can start before approval, but you do so at your own risk. If the plans are subsequently rejected or conditionally approved, you may need to undo or modify work already completed. Most builders wait for approval on a full plans application before starting.

Do I need building control for a like-for-like repair?

Generally no. Replacing damaged materials with the same or similar materials (e.g. replacing broken roof tiles with matching tiles, repairing a section of render) is maintenance and is not controlled work. However, if you are replacing a thermal element (e.g. re-roofing more than 25% of a roof, or re-rendering more than 25% of a wall), you must upgrade the thermal performance to current Part L standards, and this is controlled work.

What is a completion certificate and why does it matter?

A completion certificate is the formal document issued by building control (either the local authority or a registered building control approver) confirming that the work has been inspected and complies with the Building Regulations. It is the proof that the work was done properly. Solicitors require it when a property is sold. Without it, the homeowner has no official evidence of compliance, which can cause significant problems at the point of sale.

How long does building control take?

For a building notice, there is a 48-hour minimum before you can start. Inspections happen at agreed stages during construction, and a completion certificate is issued after the final inspection. For a full plans application, allow 5 weeks for plan checking (8 weeks if extended). Inspection timescales during construction depend on the local authority's workload -- most aim to inspect within 1-2 working days of being notified.

Do competent person scheme certificates expire?

No. A Building Regulations Compliance Certificate issued through a competent person scheme does not expire. It is a permanent record that the work complied with the Regulations at the time it was carried out. However, the annual Gas Safety Certificate (CP12) for landlords is a separate document and must be renewed every 12 months.

Regulations & Standards

• Building Act 1984 -- the primary legislation giving local authorities the power to make and enforce Building Regulations in England and Wales.

• Building Regulations 2010 (SI 2010/2214) (as amended) -- the statutory instrument that defines controlled work, exempt work, application procedures, and competent person schemes.

• Approved Document A -- Structure (load-bearing walls, foundations, RSJs).

• Approved Document B -- Fire Safety (means of escape, fire resistance of elements, smoke alarms).

• Approved Document F -- Ventilation (extract rates for kitchens, bathrooms, utility rooms).

• Approved Document G -- Sanitation, hot water safety, and water efficiency.

• Approved Document H -- Drainage and waste disposal.

• Approved Document J -- Combustion appliances and fuel storage systems (boilers, stoves, flues, oil tanks).

• Approved Document L -- Conservation of fuel and power (insulation, boiler efficiency, thermal elements).

• Approved Document M -- Access to and use of buildings (Part M4 for dwellings).

• Approved Document P -- Electrical safety in dwellings (Part P notification requirements).

• BS 7671 (IET Wiring Regulations, 18th Edition) -- the technical standard for electrical installations referenced by Part P.

• GOV.UK -- Building regulations approval

• GOV.UK -- Competent person schemes

• GOV.UK -- Competent person scheme: current schemes

• Planning Portal -- Exemptions from building regulations

• Planning Portal -- Kitchens and bathrooms

• Planning Portal -- Boilers and heating

• Planning Portal -- Electrics

• LABC -- Building control exemptions

• LABC -- When does a replacement kitchen or bathroom need approval?

• LABC -- What type of building regulation application?

• LABC -- No building regulations approval?

• Gas Safe Register -- Building Regulations certificates

• FENSA -- About FENSA

• IET -- Part P of the Building Regulations

• Electrical Safety First -- Building Regulations in England

• Legislation.gov.uk -- Building Act 1984

• Legislation.gov.uk -- Building Regulations 2010

• competent person -- Competent person schemes explained

• part p notifications -- Part P electrical notification requirements

• landlord certificates -- Landlord certificate requirements