- Size i.e. height, width, floor area
- Architectural layout, required
number of rooms, windows, bathroom etc.
- Extent of alterations/changes required
- Suitability of existing structure
- Suitability of roof type
- Extent of mechanical and electrical
services, facilities, fittings required
- Specification of finishes, details
- Location, Travel, distance and
time and inconvenience and hence costs.
- Access available – for scaffolding,
skips, transport, parking etc.
Though the Building Regulations determine
basic parameters of the specification the actual specification
may be determined more appropriately by the existing
standards and finishes in the house. For example moulded
skirting and architrave or a cut string stairs with
turned spindles and continuous handrail (without newels)
‘to match materials, style and detail of existing’
would cost significantly more than standard ex stock
items and can often involve long lead times.
There is therefore no typical cost
or rate per m².
The cost of each proposal has to be estimated based
on the above factors and possibly factors or features
unique to that specific property. It is common for radically
different jobs to be done on exactly similar and neighbouring