A VELUX loft conversion guide - VELUX loft conversion FAQ's, limitations, requirements+

Posted by Lawrie Fraser on 27th February 2023

Stylish and bright bedroom in the attic with a 3in1 roof window from VELUX

If you're looking to add more space to your home, a loft conversion is an excellent way to do it. Not only does it increase the living space in your home, but it can also add value to your property. However, when it comes to loft conversions, there are many things to consider, including the type of windows you choose. In this blog, we'll explore the benefits of Velux loft conversions and why they're a great choice for any home.

What is a Velux Loft Conversion?

A Velux loft conversion is a type of loft conversion that uses Velux windows. VELUX is a brand of skylight and roof windows that are known for their high-quality and energy-efficient designs. VELUX loft conversions are a popular choice because they allow natural light to flood into the space, creating a bright and welcoming atmosphere. Loft conversion with VELUX windows is usually to improve your home instead of moving.

Benefits of Velux Loft Conversions:

  • Natural Light: One of the main benefits of Velux loft conversions is that they provide natural light. This can make the space feel brighter, more welcoming, and more open.
  • Ventilation: Velux windows can also provide ventilation, which is essential in a loft conversion. Ventilation helps to remove stale air and moisture, making the space more comfortable to live in.
  • Energy Efficiency: Velux windows are designed to be energy-efficient, which can help to reduce your energy bills. They are made with high-quality materials that help to prevent heat loss and keep your home warm in the winter.
  • Versatility: Velux windows come in a range of sizes and styles, so you can choose the perfect window to suit your home's design and your personal preferences.
  • Easy to Install: Velux loft conversions are relatively easy to install, with a simple process that can be completed by a professional installer.
  • Cost-Effective: Velux loft conversions are often more cost-effective than other types of loft conversions. This is because they require less structural work and can be completed more quickly.

Who can convert their loft?

The short answer is. Anyone. However, there can be limitations to what the conversion can include. So, here Is some questions you may want to ask before you begin/plan your perfect loft conversion.

Understanding your roof pitch.

The roof pitch is a measurement (in degrees) to the gradient/steepness of the slope of your roof. Usually, the steeper the roofs pitch the easier it is for a loft conversion as this allows a larger space area. However, this is only a limitation and not a defining factor. The VELUX low-pitch roof window can go on roof pitches from 10 degrees. So there definitely are options.

Does your attic/loft space have enough headroom?

For a traditional loft conversion where you are looking to put roof windows into your attic space. You will need to ensure you have around 2.2-2.4m of headroom required between the floor and the underside of the beam (ridge beam). For lofts which do not have enough space. It is very complicated and your loft conversion may not be able to proceed. However, dormer roof windows or a roof replacement would solve this issue. However, these can be expensive.

Roofing integrity/structure.

In more modern properties. Construction companies cut costs and changed home styles. Houses after the 1970’s have a slimmer, busier roofing frame. Whereas homes before this have less, but thicker, beams in the roofing structure. A lot of homes from the 1980’s also have zinc, corrugated metal, rubber cladding roofing too. Which usually is less simple than a traditional roof.

These houses with less, but thicker beams usually allow for the easiest loft conversions. However, no matter what there is always a way to work around this. With the VELUX ZWC onsite flashing set, its easy to put a roof window in ant roof.

Your installer, architect, builder, or roofer should be able to specify on your roofs structure and its roof window compatibility.

Things to consider.

Here are some key factors to keep in mind:

  • Building regulations: You will need to check with your local authority to ensure that your planned loft conversion meets all relevant building regulations. These regulations cover things like structural safety, fire safety, insulation, ventilation, and access to the loft space.
  • Planning permission: Depending on the size and location of your property, you may need to obtain planning permission before converting your loft. Check with your local authority to see if this applies to your situation.
  • Structural feasibility: You will need to have a structural engineer or builder assess whether your loft is structurally sound and able to support the weight of the new conversion. This will help you determine whether any additional work is needed to reinforce the existing structure.
  • Head height: It's important to ensure that the loft has enough head height to make it a comfortable living space. Generally, a minimum height of 2.2 meters is recommended.
  • Stairs: You will need to install a staircase leading up to the loft space, which can take up a significant amount of floor space. Consider how this will impact the layout of your existing home.
  • Insulation and ventilation: It's important to ensure that the loft is properly insulated and ventilated to prevent heat loss and maintain good air quality.
  • Lighting: Natural light is often limited in loft spaces, so consider installing skylights or dormer windows to increase the amount of light coming in. You may also need to plan for artificial lighting to ensure the space is well-lit.
  • Plumbing and heating: If you plan to use the loft space as a bedroom or bathroom, you will need to ensure that plumbing and heating are installed to provide running water and warmth.
  • Budget: Loft conversions can be expensive, so it's important to carefully consider your budget and plan accordingly. Be sure to factor in any unexpected costs that may arise during the project.

By keeping these factors in mind, you can help ensure a successful loft conversion project that adds value and comfort to your home.

The costs of a loft conversion.

The cost of a loft conversion can vary greatly depending on a number of factors, including the size and type of conversion, the materials used, and the location of your home. Here are some rough estimates to give you an idea of what you might expect to pay:

  • Basic loft conversion: This type of conversion typically involves adding flooring, insulation, lighting, and access via a staircase. Prices can start at around £15,000 - £20,000 for a basic loft conversion.
  • Dormer loft conversion: A dormer is an extension to the existing roof that creates additional headroom and floor space. Prices can start at around £25,000 - £35,000 for a dormer loft conversion.
  • Hip-to-gable loft conversion: This type of conversion involves extending the sloping side of your roof to create additional headroom and floor space. Prices can start at around £30,000 - £40,000 for a hip-to-gable loft conversion.
  • Mansard loft conversion: This is the most complex type of loft conversion, involving significant alterations to the shape of the roof to create additional living space. Prices can start at around £40,000 - £50,000 for a mansard loft conversion.

Although the costs can be very expensive VELUX loft conversions are some of the cheapest in the market, with, in our opinion. The best look. It's important to keep in mind that these are rough estimates, and the actual cost of your loft conversion may vary depending on your specific requirements and location. Other factors that can impact the cost include the need for planning permission, the cost of materials and labour, and any unexpected issues that may arise during the project. Be sure to get multiple quotes from reputable builders or loft conversion specialists to get a better idea of the cost.


Velux loft conversions are a popular option for homeowners who want to add lighter and space to their home. However, there are some restrictions and limitations that you should be aware of before considering this type of loft conversion. Here are some common Velux loft conversion restrictions:

  1. Roof structure: Velux loft conversions are only suitable for properties with a sloping roof. If your property has a flat roof, you will need to consider a different type of loft conversion. Or looking at the VELUX flat roof window range.
  2. Head height: Velux loft conversions typically require a minimum head height of 2.2 meters to comply with building regulations. If your existing loft space does not meet this requirement, you may need to consider alternative types of loft conversion, such as a dormer or mansard conversion.
  3. Planning permission: In some cases, planning permission may be required for Velux loft conversions. This will depend on factors such as the size and location of your property, and whether the conversion will affect the appearance of your home.
  4. Fire safety: Velux loft conversions must comply with fire safety regulations, including the installation of appropriate fire doors and smoke alarms. Use Fire escape roof windows – like the RoofLITE MOE.
  5. Building regulations: All loft conversions, including Velux conversions, must meet building regulations. This includes requirements for structural safety, insulation, ventilation, and access to the loft space.

It's important to consult with a qualified builder or loft conversion specialist to determine whether a Velux loft conversion is a suitable option for your home, and to ensure that the conversion complies with all relevant regulations and restrictions.

Contact a building control body (BCB) for a list of building regulations appropriate to your property. You can find this information on GOV.co.uk.

If you know what you are looking for or need some advice on VELUX windows or VELUX sizes for your loft conversion. Please do not hesitate to contact our sales team at sales@yarddirect.com