What types of conversions are available?

Velux (Roof Light)

A Velux (Roof Light) Conversion is Converting your loft without changing any of its original shape. Good for higher roofs where head height isn’t a problem. Velux are the leading manufacturer of roof windows, with more than half a century of industry experience. Velux windows are designed to fit flush with the line of the roof. Only a small amount of alterations are required to the roof for fitting, this option helps keep the cost of a Loft Conversion down.


A dormer is reshaping the roof to give greater internal height and space; there are many different styles of Dormer. In most cases dormers are located on the side or rear of the roof, although more picturesque dormers can face towards the front (subject to planning permission). Velux windows can be utilised to provide extra natural light. French windows can also be fitted in dormers providing vast amounts of natural light and ventilation. Flat roof dormers allow you to gain the maximum internal space in your loft conversion. Bonnet dormers are a more attractive option but this gives less internal space.

Hip to Gable

A Hip to Gable dormer extends the hip of your existing roof into a Gable end. This gives a greater roof space and also enables a larger rear dormer to be constructed maximising your interior space. This type of loft conversion is most popular in traditional semi-detached houses (although great in any hipped roof) enabling the new stairs to go over the existing stairs minimising lost space in original living area.


A Mansard Conversion is similar to a flat roof dormer, the main difference being the front slopes at about 70 degrees. This style of conversion is mainly used in inner London. Windows in a Mansard Conversion take on the appearance of small dormers making it more aesthetically pleasing.

General Questions

We have tried to provide an answer to the typical questions people ask us prior to undertaking a loft conversion or extension. If we have not covered your question here, please feel free to give as a call and we will endeavour to answer your question for you.

Is my loft too small?

In order to comply with Building Regulations, the loft has to be a minimum of 2.4m or 7'6" at its highest point (i.e. the apex of the roof). Those measurements are taken from the top surface of the ceiling boards below, to the felt at the very apex of the roof. With that in mind, we can make the most of even the smallest lofts with the imaginative use of dormer windows and staircase positioning.

How long does a loft conversion take?

For an average sized home, from commencement of work, we would normally be complete in an average of 8-10 weeks depending on the size and scope of works.

Will I need to have a dormer window?

Nearly all loft conversions can have a dormer window, which can provide useful extra space in a tight loft, and add light and outlook to a room. Some smaller lofts may require a dormer at the top of the stairs to provide the necessary headroom as you climb the stairs into the loft.

What about planning permission?

Planning permission is required in some circumstances. We will be pleased to offer advice and guidance.

Will I need to arrange Building Regulations Approval and will that be an additional cost?

CLC are used to dealing with Building Control and we will complete all necessary paperwork for you. The costs for these are detailed within your quotation.

I have a water tank and chimney in my loft, is that a problem?

Using our own plumbers we can easily reposition any plumbing to maximize usable space in the loft. Chimney stacks usually have to remain in position, although can be removed, often subject to planning.

I would like a bathroom in the loft conversion, what impact does this have?

Bathrooms do require additional considerations, particularly ensuring the water supply to the loft is sufficient to meet your expectations. Often when placing a bathroom in a loft we recommend removing traditional tanks and installing an unvented water system. When designing your conversion, the position of existing bathroom services (soil and water etc.) will be taken into consideration to ensure services are available. Your surveyor would be happy to discuss these options with you.

How much space will I realistically achieve from a loft conversion?

This is entirely dependant on the size of your property and height of your loft today. By obtaining an estimate, we will be able to provide you with an idea of the floor area available.

How will a loft conversion affect my home?

CLC undertakes all conversions to cause as little disruption as possible to our clients. You will be able to remain living in the property throughout the conversion. Our staff are experienced working in domestic clients and will leave your home in a habitable, clean and safe condition each evening. Whilst working we will advise you of health and safety risks in accordance with our policy and provide notice of any daily works that may affect you.

If you have any queries or wish to make an appointment, please contact us:

Mobile: 07710 291187



Or use our contact form.

Please note we only cover the areas of Portsmouth, Copnor, Drayton, Farlington, Porchester. 


Our business operates only on Monday to Friday 8am- 5pm, we are closed on the weekend and will not reply to emails until the Monday following. Appointments will be allocated on Tuesdays with slots of 10am, 12pm, 2pm and 4pm for property viewing.

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