Practical considerations

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    Windows and insulation

    Window options
    Choosing the right windows is crucial for any conversion, as the joy of such a space is the availability of daylight.

    Dormer windows offer extra headroom as well as light, as the glazed units are normally set parallel to the facade of the house, and a section of the pitched roof raised to accommodate them. Because dormer windows change the exterior appearance of a house, planning permission is sometimes required. Skylights or rooflights are simple to install flat into the roof.

    Part L of the building regulations insists on a good standard of insulation as loft spaces can be subject to extreme temperatures, getting very hot in summer and feeling extra chilly in winter.

    For walls and ceilings, specialists generally use a rigid insulation such as Celotex insulation boards while a fibre blanket such as Gyprock Rockwool is often used between floor joists. This insulation should be 150-250mm thick in order to satisfy building regulations for thermal, sound and fire insulation. Soundproofing is also advised.

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