Secured by Design: Understanding PAS 24 and Heritage Window Security

When it comes to replacing windows in a period property, security is just as important as aesthetics. But understanding the window security standards that apply to your project — particularly if you’re working within a conservation area — can feel overwhelming.

This guide breaks down the key UK building regulations and standards relevant to window security, including PAS 24, Approved Document Q, and Approved Document F, and explains how modern timber-effect uPVC windows from Timberlook can meet every requirement without compromising the character of your home.

What is PAS 24 and why does it matter?

PAS 24 is a design standard published by the British Standards Institution (BSI) that sets out the requirements of PAS testing for windows, doors, and roof lights. It specifies the level of security a window or door must provide against physical attack by an opportunist burglar.

In practical terms, a PAS 24-tested window must withstand attempts at unauthorised access — including manipulation of hinges, locks, and cylinders — as well as direct force. Products that meet PAS 24 are tested to a BS EN framework and carry the relevant certification or accreditation from a UKAS-accredited body.

Approved Document Q: security requirements for dwellings

Approved Document Q (often referred to as Part Q) is the section of the building regulations in England that deals specifically with security. Introduced in October 2015, Document Q requires that reasonable provision is made to resist unauthorised access to all new residential buildings and dwellings formed by a change of use.

Under Approved Document Q, all easily accessible windows, doors (including garage doors and doors to communal areas), and roof lights must meet PAS 24 or an equivalent standard. “Easily accessible” includes any window or door on the ground floor, or those accessible from flat roofs, balconies, or other surfaces that an opportunistic burglar could reach.

The security requirements of regulations Part Q apply to:

• New homes and new-build projects
• Conversions and change of use developments (for example, converting a commercial building into dwellings)
• Any work that requires building control sign-off

If you’re replacing windows in an existing home voluntarily (i.e., not as part of a change of use), Part Q may not legally apply — but many insurers and local authority officers still recommend PAS 24 security products as best practice. Meeting these window security standards can also give you genuine peace of mind against burglary and intruders.

Approved Document F: getting ventilation right

Security isn’t the only regulatory consideration when specifying new windows. Approved Document F covers ventilation in buildings and sets out minimum requirements for air quality in dwellings.

For heritage window replacements, this is especially relevant. Traditional timber windows often relied on draughts and gaps for airflow — clearly not ideal for energy efficiency. Modern replacements must include adequate trickle ventilation to comply with Approved Document F, but visible trickle vents can undermine a heritage aesthetic.

Timberlook windows address this with concealed trickle vents that maintain the clean sightlines expected in conservation-sensitive projects, while fully meeting current ventilation requirements.

How Timberlook windows meet modern regulations

This is where the balance between compliance and character becomes crucial. Many homeowners assume that meeting PAS 24 and current building regulations means sacrificing the look of traditional timber. That’s simply not the case.

Our range of heritage flush casement windows are manufactured from modern uPVC using the Timberweld process. This innovative manufacturing technique eliminates the tell-tale diagonal welds found on standard uPVC frames, replacing them with an authentic mortise and tenon joint detail. The result is a window that closely replicates the appearance of traditional 19th-century timber joinery.

But the performance is thoroughly modern:

PAS 24 compliance — Timberlook windows are designed to meet PAS 24 security requirements, with robust window hardware, multi-point locking systems, and reinforced frames that resist physical attack

Energy efficiency — High-performance glazing and thermally broken profiles help meet the demands of current energy buildings regulations (Approved Document L), keeping heating costs down and improving comfort

Durability — Unlike traditional timber, uPVC will not rot, warp, or require regular repainting, offering long-lasting performance with minimal maintenance

Ventilation — Concealed trickle vents satisfy Approved Document F without compromising heritage aesthetics

Fire safety — Products are designed with consideration for relevant fire safety requirements within the approved documents

Timberlook windows have been approved for use in conservation areas across the UK, satisfying planning officers and building control officer requirements alike. Their painstaking attention to period detail — combined with full regulatory compliance — makes them a trusted choice for heritage renovations, contemporary new builds, and everything in between.

Secured by Design: a crime prevention initiative worth knowing

It’s also worth understanding the Secured by Design programme, a crime prevention initiative owned by the UK Police Service. Products that carry the Secured by Design accreditation have been independently assessed to deliver a proven level of security against burglary and break-ins. PAS 24 testing is a core component of this classification, and specifying Secured by Design-approved windows and door hardware can satisfy both building control and insurance requirements.

When selecting windows and doors, ask your installer about the specific specification and certification of the products being offered. Reputable manufacturers will be transparent about their testing credentials and accreditation status.

For further information on PAS 24 and British Standards for security, the BSI website is a reliable resource. Details on the building regulations and approved documents can be found on the UK Government’s Planning Portal.

Why choose Timberlook?

Timberlook offers homeowners windows and doors that honour the character of period properties while meeting every current regulatory requirement. Whether your project involves a conservation area renovation, or a contemporary new build, our expert team can help you navigate the building regulations with confidence.

With a huge range of finishes — including woodgrain effects, dual-colour options, anthracite grey, and light oak — Timberlook heritage windows and doors are designed to complement any property style.

FAQs

Is PAS 24 a legal requirement for replacement windows?

For new homes and change of use conversions in England, PAS 24 is required under Approved Document Q. For voluntary replacements in existing homes, it’s strongly recommended but not always mandatory.

Do Timberlook windows meet window security standards?

Yes. Timberlook windows are designed to meet PAS 24 security requirements, providing proven resistance against unauthorised access by intruders.

Can uPVC windows be used in conservation areas?

Yes. Timberlook’s flush sash and casement windows have been approved for use in conservation areas, thanks to their authentic timber-like appearance and Timberweld jointing technology.

What is Approved Document Q?

Part Q of the building regulations sets out security requirements for easily accessible windows, external doors, and roof lights in new residential buildings and conversions in England.

Do Timberlook windows include trickle ventilation?

Yes. All Timberlook windows feature concealed trickle vents to comply with Approved Document F ventilation requirements without affecting the heritage aesthetic.

Will PAS 24 windows help with home insurance?

Many insurers look favourably on PAS 24-compliant windows and door hardware. Meeting recognised window security standards can support your insurance classification and reduce the risk of burglary-related claims.

Get in touch with Timberlook: contact Timberlook today

Ready to explore heritage-style windows that deliver on both security and style? Whether you’re a homeowner planning a renovation, an installer looking for a trusted door system and window range, or a specifier working on a conservation project, Timberlook’s expert team is here to help.

Find a Timberlook installer in your local area or learn more about our full range of wood-effect uPVC windows and doors.

Fill in our online contact form or call us on 01253 888 222.