Extensions Question

One storey to two storey extension including loft conversion

We are considering buying a semi-detached house that currently has a one storey side extension (8m x 4m). The main part of the house has three floors with the loft converted. Access to the loft is via a staircase from the first floor that enters the middle of the loft room and therefore dominates the room and not possible to fit a double bed.

We would only go through with the purchase if we could convert the property into a two storey (inc loft) extension. Also we would want to remove the current staircase and within the first floor side extension build a l-shaped or dog-leg staircase so you enter the loft conversion (with extension) in the corner of the room rather than the middle.

I know there are some dependencies but does anyone know whether this would be theoretically possible? If so, any very rough idea of cost? And how much more would it cost to demolish the current one storey extension and start again with the two storey extension?

Obviously if we did buy it we would go with an architect and get various quotes from builders but as we don't own the house now this isn't possible to do, and don't want to waste time and money if this sort of renovation isn't possible.

Thanks in advance for your help,

1 Answer

Best Answer

Hi, this sort of work it definately possible. To build on top of a single storey you need to establish that the foundations and internal walls are adequate to take the upper floors as all the weight is carried on the internal walls. If not then is would be better to demolish the single storey extension and start again. Also it may be that the walls do not meet current regulations for insulation. The position of the stairs to the loft at the moment maybe be governed by a hip end roof and the only headroom is in the middle of the roof. This can be overcome with a dormer to the new extension or an extension with a gable end roof if planning allow this. The stairs to the loft can be accommodated in the new extension. There are many configurations for this work and to state a cost would be pure guesswork. I hope this helps.

Answered 23rd Apr 2012

Millhouse Building & Joinery

Member since 16 Apr 2012

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