In older properties it can often make sense to create one larger room for modern family living. The most efficient way of doing this is to knock the wall down between two rooms, called forming a slapping. A structural engineer should always be consulted to ensure the correct lintels specification is used to support the wall and floors above. You will also need to ensure that any steel beams are protected from fire. The builder will needle the wall above the opening and support these on temporary props before removing the wall where the opening is being formed. The lintel will then be positioned on padstones set into the wall on each side and shims put in above to make up the space between the top of the lintel and the remaining wall. As with all structural alterations there will be evidence of settlement in the finishes around the affected area.
Designing a flat roof to a dormer may be unavoidable because of the proximity of the existing ridge. Although three layer felt is the most economic option it will need to be maintained over its 10 year lifespan. Consider alternatibes like single ply or sheet metal. www.marchitectsltd.com
Often I am asked about the feasibility of altering an existing extension to provide a more rational floor plan and facilities. In some cases I have to advise that the demolition and rebuilding of an extension is the most cost effective route to achieve the client's goals. Key factors that may have a bearing are: Age of the existing extension and the method of construction. This may make it unsuitable or structurally expensive to alter. The existing fabric will not meet today's need to conserve energy in the home and therefore would require upgrading. The position of the extension in relation to the house may have been designed poorly resulting in a floor plan which does not provide the opportunity to improve the linkage with the existing house and/ or improve the layout of the facilities. Glazing. It may be because the client wishes to change the nature of the extension to a family room for instance with improved visibility to a garden that larger windows are necessary....
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