4. It is better to achieve one or two good sized functional rooms to compensate for the lack of head room in some areas of the new rooms rather than trying to cram in the bedroom numbers for the sake of it where the new rooms can become nothing more than single bed sleeping podules with very little inbuilt amenity value.
5. If flat roofed dormers can only be achieved due to the low ridge height then split the dormers into 2 or three smaller ones with no more than 1200mm (4') wide windows to break up its bulk. Always, always always recess the dormer into the roof slope to reduce the dormers bulk - DO NOT BUILD THE EXTERNAL FACE OF THE DORMER WALL OFF THE EXISTING EXTERNAL WALL OF THE HOUSE.
6. If a client wants a conversion with only Velux type roof lights then all well & good (much cheaper as well). However an exercise should be completed to explore the possibilities of a strategically located dormer or two that often frees up an extra 30% floor area that the client may not have realised for very little extra money.
7. Dormers are not the only design solution to more light & space - consideration could also be given to a hip to gable conversion of the side roof for example that wont look out of keeping (unless your a semi of course).
8. As a rule of thumb to the practicality of your new room in the roof - if you can already touch the ridge board when standing in the loft (about 2.3M or less), then its normally too small to form useful functioning bedrooms unless a bulky box dormer is constructed (which is what we are trying to avoid) If it is an area just for a play room or a study then all well & good but beware, many people have embarked on tight loft conversions only to realise too late that that they have no where to place the bed or locate a wardrobe.
There are a great many other issues to consider as well when completing loft conversions such as overheating, fire regs, weather protection during the works etc. & these are major discussion topics in themselves that I will leave for another day. However, the points listed above are the main ones relative to the external design & appearance of loft conversions.
Our 'Maximum Build Planning Guide' explains further the tactics involved when developing a site with a loft conversion or extension & how to give yourself the best chance of being granted a planning permission or planning approval.
http://www.planning-approval.co.uk
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