- The Design Process
The design process generally consists of four stages:
We can assist in any one or all stages, as required. Some extensions
do not require planning permission as they can be built under Permitted
Development rights, but all extensions require Building Regulation
you do not have a builder lined up, we can help tender your extension
with a select panel of builders, all who have done work with us
Generally three competitive quotes are obtained.
Whether or not you have your own builder, site supervision is an
important part of the final construction stage. Site visits can
be made on a weekly basis to ensure the work progresses smoothly
and in accordance with the drawings.
The Party Wall act has been in force since 1996 and provides a
framework for preventing or resolving disputes where building works
affect a party wall, boundary or adjacent building.
If all affected neighbours have no objection to your extension,
then no Party Wall Agreement may be needed. To be safe, a standard
notice can be given to, and signed by the affected neighbours giving
you rights to build your extension, hopefully with no further involvement
of the Party Wall Act.
If any neighbour objects, then a full Party Wall Agreement may be
required. You, as the commissioning owner, then have to pay for
a Party Wall Surveyor to represent the affected neighbours and draw
up a Party Wall Agreement. This can be costly and take several months
in the worst cases!
See the Fees section for more details on costs.
The design work starts with a survey of your house and the drawing
up of the existing plans, together with a discussion on what you
require from your proposed extension.
Several options may be drawn up and discussed until a final scheme
is approved and signed off. The planning application is then made
and a decision is usually given 8 weeks after the application has
Building Regulation Application
Once the planning application has been made the building regulation
application can be made. This concerns the technical details of
the construction of the extension, such as foundations, insulation,
means of escape, and any structural elements such as beams. A decision
is usually given 5 weeks after the application has been registered.
If there are any objections from neighbours to your extension, or
if it is large or complex, it may be prudent to wait until planning
permission is given before proceeding to the building regulation
When building regulation approval has been received, the extension
can be put out to competitive tender to a panel of builders who
have all completed several extensions with us. Three
competitive quotes are usually obtained and a contractor is normally
appointed within 3 weeks. Contractors typically quote 4-8 weeks
lead time before they can start work.
Most average-sized extensions take 3-4 months to complete. Work
is always inspected at key stages by the local authority building
inspector, these include foundations, drainage, roof, insulation,
ventilation and means of escape.
Weekly site supervision by us is also recommended to ensure the
work progresses smoothly and in accordance with the drawings. Progress
meetings are also held and minutes distributed to the client and