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STRUCTURAL CALCULATIONS
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PLANNING DESIGN
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BUILDING REGULATIONS
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PARTY WALL SERVICES
DISCOUNT PLANS LTD
Architectural Design Studio
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JOINING EXTENSIONS TOGETHER USING THE PARTY WALL IS COMMON PRACTICE
Our design team specialises in merging rear extensions together
If you live in a terraced property and your neighbour or both neighbours have already built their extension to the rear of their house, then you can choose to build off their wall, depending on your agreement with your neighbour and the style you opt for which needs to be consistent with your neighbour's extension arrangement. It does not matter when the house was built, such as being constructed in Victorian times or in the 1930s, building off the neighbouring side wall is permitted. Your extension side wall can then be built off the adjoining party wall, saving you space and money on the build. This article will discuss the pros and cons of using a party wall or having an independent wall to serve your proposed extension.
What are all the BENEFITS of JOINING your extension with your neighbour's?
Usually, when applying for planning permission, the homeowner can decide to build astride the boundary or to build solely on their land. Building astride the boundary will be subject to planning consent by filling out Certificate B to serve a notice to your adjoining neighbour. This can be done under a HOUSEHOLDER APPLICATION only. Building astride the boundary will not be achievable under a certificate of lawfulness application as the extension's width would be greater than the house width so that it would lead to a REFUSAL decision being made. As prior neighbouring consent for up to 6000mm deep falls under the same rules as PD, this application route would also not be possible. Usually, for terraced houses, the allowed depth of a single-storey rear extension under a householder application would be 3000mm - 3500mm depending on the borough in the property is located, as each borough has slightly different restrictions.
EXAMPLE OF WHAT CAN HAPPEN IF
TWO NEIGHBOURS HAVE BUILT EXTENSIONS
REAR EXTENSION FLAT ROOF
Example of a Flat Roof Arrangement - Located in Barnet
Proposed design showing the rear elevation buildup
This design is a typical situation that uses both neighbours' walls to build off from. Both neighbours had built along the boundary line on their land, each side going out to a depth of 3500mm with built-up parapets on either side of the side flanking walls. This made it perfect for the homeowner to use both neighbours' party walls to build a similar extension for the building owner. Both neighbours agreed on the build-off from their side wall, with signed party wall awards being carried out for each neighbour. Drawings had to reflect the arrangement to comply with the neighbour's acceptance.
"Our Design Service creates detailed drawings tailored to your vision. We bring your ideas to life with creativity and precision, keeping you in the know at all times"
The Plan above shows the building owner's proposed single-storey rear extension being built onto the party wall on both neighbours' walls for clarity. At Discount Plans Ltd, our design team specialises in preparing this kind of joined property arrangement by designing weathering and construction details as they are added to the completed awards issued by the Party Wall surveyors. It is common practice to liaise with party wall surveyors who request these details to be accurate, as builders will use the details to construct.
EXAMPLE OF WHAT CAN HAPPEN IF
ONE NEIGHBOUR HAS BUILT AN EXTENSION
WRAPAROUND EXTENSION - PITCHED ROOF
Example of a Pitched Roof Arrangement - Before
During the works using the party wall with a box gutter
The above situation involved an already-built side return on the neighbour's side with a pitched roof and box gutter arrangement. The neighbour hired a party wall surveyor and requested that the build be made so that it comes off the party wall side. New drawings were created and issued for awards to be written up and agreed upon by all parties. Here at Discount Plans Ltd, our design team can assist you in whatever situation arises; we work closely alongside Party Wall London Limited, a very experienced team taking care of any party wall matters that are present.
Above is a detailed floor plan showing the proposed side return building arrangement with combined information annotated, such as engineering input showing steel supports, drainage design for Thames Water adaption and Building Regulation information for Building Control to sign off from. The client saved money on part of the build by using the next neighbour's party wall, which was one of the main benefits, as well as giving a more comprehensive and wider internal extension.
Our design team creates comprehensive drawings for all these scenarios, illustrating construction elements and weathering features to ensure clarity for all third parties, particularly party wall surveyors, allowing for the approval of awards. These details are invaluable for builders as they clarify construction methods and integration, minimizing the risk of mistakes or miscommunications on-site and ultimately saving money by ensuring the job is completed correctly the first time.
If you need a Party Wall Surveying firm to assist you in any of the above matters, look no further.
Based in North London, specializes in resolving dormer-related matters between neighbouring properties.
Their expert team ensures a fair and balanced approach, helping you and your neighbours seamlessly merge dormers for optimal design and equal benefit to both properties.
Contact our team today for a free qoutation
Remember that if you are choosing more than one design you will be offered a further discount on any other second design.
We will not be beaten on price and if we are we will offer you a price match service in design* subject to agreement.
We hope you found this helpful article for your proposed loft conversion proposal, join1000s of other satisfied customers whom we have helped design to their tailored layout. Regards John. Domenech
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