One of the benefits of loft conversions is that they let in lots of natural light and offer wonderful views. However, the windows are also important for ventilation and there are regulations surrounding the installation of windows in attic conversions, which it is vital to comply with. Luckily, the loft conversion specialists at Econoloft make this easy by monitoring all work to ensure it is compliant, from planning right through to completion. As a loft conversion company formed over 30 years ago, we know all the rules surrounding loft extension windows and advise on the requirements of your project in Dartford or elsewhere in the UK.

With Econoloft, you are in the best hands. Having been providing expert loft conversion planning and construction services for many years, we know all the legal and safety requirements relating to these projects. We stay up to date with latest regulations to deliver fully compliant work in our capacity as specialist loft converters and steel suppliers.

Econoloft is also an approved installer of Velux windows, so our customers have complete confidence in the quality of our work. When considering windows for your conversion, factor in the following points:

Planning Permission

While many loft conversions fall under permitted development, your choice of windows may affect this. Generally, you won’t need permission if new standard windows look like existing windows. For skylights, you will not need permission if they extend no more than 150mm beyond the plane of the roof slope. In addition, if fitting side-facing rooflights, they must be obscure-glazed.

There are further controls which we can discuss on an individual basis. It is also important to note that listed buildings in Dartford and those in conservation areas are subject to further restrictions. This means attic conversions may require planning permission even if you meet the above criteria.


Our loft conversion specialists make sure windows meet regulations regarding ventilation, fire safety and thermal efficiency.


Different levels of ventilation are necessary for loft extensions, depending on how you plan to use the space. For example, bathrooms, utility rooms and kitchens produce more steam and condensation than other rooms, so will require higher levels of ventilation.

As an experienced loft conversion company, we assess the needs of your project in Dartford and use a combination of windows and mechanical fans to achieve the correct level of ventilation.

Fire Safety

When planning loft conversions, fire safety is a key consideration. Any loft conversion specialists will tell you how important it is to comply with fire safety regulations and advise how best to do so.

You may have to install fire resistant windows to prevent the risk of fire spreading. In addition, your windows may have to act as an escape route during a fire, meaning their size is an important factor. At least one window in your Dartford loft extension needs to have a width and height of 450mm or more, with an openable area no less than 0.33m².

Thermal Efficiency

The thermal value of windows is measured using a U-value, and the windows in attic conversions must meet the minimum standard set by building regulations. However, insulating above the minimum standard results in greater efficiency and lower energy bills.

As a specialist loft conversion company, Econoloft offers a range of windows and glazing options to meet requirements, including Velux windows and double or triple glazing.

Remember, our team of draughtsmen, project managers, contract managers, builders and steel suppliers have unbeatable industry knowledge, covering all aspects of loft conversion planning, building and regulations. As such, we are the trusted choice for reliable loft conversions which meet and exceed all legal requirements.
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For information and advice about windows and other loft extension features in Dartford and the rest of the UK, call Econoloft on 0800 269765, 01942 722754 or 0208 7771719.