A house extension is a major investment, and one of the first questions homeowners ask is: 'How long will the project take?' While the timeline for a house extension can vary based on several factors, from the type of extension to the complexity of the design, a clear process and an experienced team can ensure everything stays on track.
In this blog, we’ll break down the typical timeline for a house extension in London, highlighting the key stages and what to expect at each point.
Factors that Affect House Extension Timelines
Several factors can impact how long it takes to complete a house extension in London. These include:
Size and Scope: A small kitchen extension may take a few months, while a large two-storey rear extension could take significantly longer.
Type of Property: Homes in conservation areas, such as in Hampstead or Islington, may require additional approvals and permits.
Planning Permissions: The time taken to get approval from the local council, particularly in areas with stricter regulations like Kensington and Chelsea, can impact the timeline.
Design Complexity: Unique designs or the use of specialised materials (such as zinc-clad extensions) can add to the duration.
Step 1: Consultation and Initial Design (2-4 weeks)
The process begins with an initial consultation, where we visit your home in London to discuss your vision. During this phase, we’ll explore your options, discuss your budget, and identify any planning requirements specific to your area (for example, if you’re in a conservation area).
Once the consultation is complete, our design team begins working on the initial plans. This phase typically takes 2 to 4 weeks, depending on the complexity of the project.
Step 2: Planning and Approvals (8-12 weeks)
For many projects in London, especially in areas like Hackney or Holland Park, planning permission is required. This stage can take anywhere from 8 to 12 weeks, depending on the local authority’s process. We handle all aspects of the application, from submitting the paperwork to liaising with local councils to ensure compliance.
Extensions that fall under Permitted Development Rights may not need planning permission, which can significantly speed up the process. However, larger projects or those in conservation areas often require additional approval, which can extend this phase.
Step 3: Construction (10-16 weeks)
Once planning permission is approved, construction can begin. This is often the longest part of the process, lasting between 10 to 16 weeks depending on the size of the extension.
Foundation Work: Laying the groundwork is the first step. This is critical in ensuring the structure is safe and durable. For areas like Islington or Ealing, which have older properties, extra care may be required to ensure the new structure integrates seamlessly with the existing property.
Structural Work and Framing: This phase includes putting up the walls, roof structure, and any supporting beams. Depending on whether you’ve chosen a single-storey rear extension or a more complex double-storey extension, this part can vary in duration.
Utilities: This step includes the installation of water, gas, and electrical systems. In larger extensions, this phase can take longer due to the added complexity.
Step 4: Finishing Touches (4-6 weeks)
After the major construction is complete, the finishing touches can begin. This includes plastering, painting, flooring installation, and any custom carpentry or interior design features you’ve selected. In luxury projects, this stage may also involve bespoke furniture, lighting, and interior styling.
Although this is the final stage, it’s one of the most important, as it transforms your house extension into a functional and beautiful living space.
Common Delays and How to Avoid Them
While a typical house extension takes around 4 to 6 months from start to finish, there are some common factors that can cause delays:
Planning Permissions: Delays in getting approval can be avoided by working with a team experienced in local council regulations, especially in stricter areas.
Weather: Poor weather conditions can sometimes delay construction, but a well-planned project timeline can build in some buffer time.
Materials: Delays in sourcing specialised materials, like bespoke glass or custom stone finishes, can push back the timeline. However, choosing a reliable contractor with trusted suppliers can minimise this risk.
A Managed Process for Success
While the timeline for a house extension in London can vary, choosing an experienced design and build team is crucial for managing the process efficiently.
At Canyon Design and Build, we have extensive experience navigating the complexities of local planning permissions, ensuring high-quality craftsmanship, and delivering luxury home extensions across London boroughs like Richmond, Islington, Ealing, Hackney, and beyond.
By working with us, you can rest assured that your project will be well-managed, minimising delays and ensuring that your vision comes to life on time and within budget.
Ready to get started on your London house extension? Explore our Luxury Home Extensions in London or contact us for a free consultation.
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