Mumford & Wood - Timber Windows & Doors
windows and doors guide

Choosing the Right Windows and Doors: A Step-by-Step Guide

From style to performance, follow this expert guide to confidently choose the best timber windows and doors for your next project.

About the Authors

Mark Spencer

Matthew Blaylock

Managing Director

Freya Olley, Head of Marketing for Mumford & Wood

Freya Olley

Head of Marketing

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Whether you are creating a brand new dream home or refurbishing or extending a property, the choice of Windows and Doors will have a major impact.

But getting this right is more than merely selecting the right style of Windows and Doors for the development (although this is a fundamental consideration). When it comes to Window and Door quality and performance, beauty really is more than skin deep.

Some of the key influences that will drive the decision-making process should include:

Legislation/Security – Part Q

The mandatory classification seeks to ensure high-security standards for new-build homes, including homes created by the change of use, such as barn conversions.

So what does that mean for homeowners, builders, developers and self-builders? For any new build, the Windows and Doorsets being used must be manufactured to a design that has been successfully tested to meet the security requirements of PAS 24:2012.

Approved Document Q is designed to prevent unauthorised access to dwellings (including flats). Doors and Windows or Roof Lights that could be accessed need to resist physical attack by a casual or opportunist burglar.

The government’s requirement states:

“Reasonable provision must be made to resist unauthorised access to any dwelling and other buildings exposed to comparable risk.”

Simply put, anyone building a new home must install Windows and Doors that have been tested to meet PAS 24:2012 performance standards. You must be able to show building inspectors that all Windows and Doors are fully certified, with full product details and test reports for each unit being installed.

This applies to:

  • a) Any Doorset or window within 2m vertically of an accessible surface (e.g., ground level, basement level, or access balcony)
  • b) Any Window within 2m vertically of a flat or sloping roof (less than 30° pitch) that is within 3.5m of ground level

Additionally:

  • Doorset letter plates must not exceed 260mm x 40mm and should not hinder access via hand or tools.
  • Front Doors must have a viewer or another method for identifying callers and be fitted with a door chain or limiter.

Sustainability

Sustainability continues to influence how people build and renovate. Environmentally conscious homeowners and developers are turning to natural materials, and timber Windows and Doors are seeing a notable rise in popularity.

Studies show that, when properly treated with paint or stain, timber Windows can last twice as long as PVCu. Opting for windows and doors crafted from FSC-certified timber sourced from responsibly managed forests helps reduce environmental impact while supporting long-term sustainability goals.

Improved Thermal Performance – How Important Are U-Values?

About 66% of energy lost from a standard window is due to radiation through glazing, measured as a U-value. The lower the U-value, the less heat escapes, and the more energy-efficient your home becomes.

For best results, choose double-glazed units that feature performance glass, warm edge spacer bars, and argon gas. Look for:

  • U-values of at least 1.1 W/m²K (centre pane)
    • That’s up to 45% more efficient than ordinary double glazing, and 80% more efficient than single glazing.

Product Failure Is a Key Reason for Replacing Windows and Doors

When replacing Windows and Doors, performance and longevity are just as important as style. Choosing products with long-term guarantees gives customers peace of mind.

If you live in a coastal location, it’s essential that Windows and Doors are independently tested to BS 6375-1:2009 and BS 6375-2:2009 for:

  • Part 1 – Weather-tightness
  • Part 2 – Operation & Strength

These tests also confirm performance for:

  • Air Permeability (EN1026)
  • Watertightness (EN1027)
  • Wind Resistance (EN12211)
  • Operating Forces (EN12046)
  • Static Torsion (EN14609)
  • Racking (EN14608)
  • Soft Body Impact (EN13049)
  • Safety (EN14609)
  • Repeated Opening (EN1191)

In salty, humid coastal environments, hardware corrosion is a risk. Choosing 316 Marine Grade stainless steel fittings for your doors and windows will offer optimal resistance.

Talk to the Experts

Leading manufacturers such as Mumford & Wood offer a wealth of knowledge and experience. Our expert team is on hand to answer technical questions or provide tailored advice for your specific build or renovation.

We can also arrange site visits to help you make the most informed decisions when choosing Windows and Doors for your project. Get in touch today and start your project with Mumford & Wood.

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