How Long Does an Extension Take to Build? A Guide by KT5 Construction

When planning a home extension, one of the most common questions is, “How long will it take to build an Extension?”. On average, Ground-floor extension takes around 10 to 16 weeks to complete, while more complex multi-storey or roof extensions may take longer. At KT5 Construction, we pride ourselves on delivering top-quality building services in London, Surrey, and across all nearby areas of the M25. With years of experience in providing professional building services, we ensure that every project, including home extensions, is completed with the highest levels of craftsmanship and within a reasonable timeframe.

In this blog, we’ll explore how long different types of extensions take to build, what factors influence the timeline, and why choosing the right builder is crucial for ensuring a smooth, stress-free project.

Factors That Influence the Timeline

1. Size of the Extension

The size of your extension plays a major role in how long the project will take. A simple, single-storey ground-floor extension will usually be quicker to complete than a multi-storey or loft conversion.

    • Ground Floor Extensions: These typically take between 10 and 16 weeks to complete, depending on the complexity and size of the space.
    • Multi-Storey Extensions: As these involve additional structural work, they often take 16 to 20 weeks.
    • Loft Conversions: These usually require 8 to 12 weeks, though dormer extensions can take a little longer.

2. Design Complexity

The more intricate your extension’s design, the longer the project may take. Simple designs with standard materials will be quicker than custom designs that require bespoke elements or architectural features. It’s important to balance your design aspirations with practical timelines to ensure the project runs smoothly.

3. Planning Permission and Approvals

If your extension requires planning permission, this can significantly affect the timeline. On average, planning permission takes 8 to 12 weeks to process, and this can delay the start of construction. However, if your extension falls under Permitted Development Rights, you may not need planning permission, reducing the overall timeline.

4. Contractor Availability

Hiring an experienced contractor like KT5 Construction well in advance can help prevent delays. Our team ensures that your project is managed efficiently, from the initial consultation to the final build. Working with an experienced team can also reduce the likelihood of mistakes or delays.

Step-by-Step Timeline Breakdown

Step 1 – Initial Consultation and Design (2-4 Weeks)

This is the stage where you’ll discuss your vision with the contractor or architect. Depending on the complexity of the design and how quickly decisions are made, this process can take anywhere from 2 to 4 weeks. During this phase, accurate designs and architectural plans are drawn up to reflect your needs.

Step 2- Planning and Approvals (8-12 Weeks)

If planning permission is required, this stage can take 8 to 12 weeks. Working with a company like KT5 Construction, who offers architectural services and manages planning permission, can streamline this process. We ensure that all necessary paperwork is accurate and filed correctly to avoid any unnecessary delays.

Step 3 – Construction Phase (10-20 Weeks)

Once the build begins, the construction phase includes:

    • Demolition and Groundwork (1-2 Weeks): Clearing the area and laying foundations.
    • Framing and Structure (2-4 Weeks): Building the framework of the extension.
    • Roofing (2-3 Weeks): Installing the roof, which can vary based on the type (flat, pitched, dormer).
    • Plumbing, Electrical, and Insulation (2-3 Weeks): Installing the necessary utilities to make the space functional.
    • Interior Finishes (3-5 Weeks): Adding plastering, flooring, and final finishes.

Step 4 – Final Finishing and Inspections (1-2 Weeks)

The final step involves inspecting the work to ensure it meets building regulations and is completed to the highest standard. At KT5 Construction, we take pride in our attention to detail, ensuring every aspect of your extension is perfect before the project is signed off.

How to Speed Up the Process

1. Pre-Planning Tips

One of the best ways to minimise delays is by planning ahead. Starting your design and getting approvals before construction can significantly shorten the build time. Working with KT5 Construction from the outset will help you stay on track.

2. Hire Experienced Contractors

Choosing an experienced contractor ensures your project will run efficiently. At KT5 Construction, we manage every stage of the project, reducing the chances of delays. Our customer-focused approach guarantees that you are always informed and involved, helping the process run smoothly.

3. Clear Communication

Maintaining open and clear communication with your contractor is crucial to avoiding delays. Regular updates and meetings ensure that everyone is on the same page and any potential issues are addressed promptly.

FAQ: Common Questions About Building an Extension

Q: What to Expect When Building an Extension

An extension can completely transform your home, adding valuable space and increasing property value. However, the timeline for an extension depends on several factors such as the complexity of the design, the size of the extension, and whether planning permission is required. Typically, extensions take anywhere from 10 to 16 weeks, but this can vary based on individual circumstances.

Q: Can You Live in a House During an Extension?

It is possible to live in your home while an extension is being built, But this depends on the extent of the work. For ground-floor extensions, many homeowners choose to stay, as the work is often confined to specific areas. However, more invasive projects, like roof extensions or extensive structural work, may require temporary relocation.

Q: How Long Does It Take to Lay the Foundations for an Extension?

Laying the foundations is a crucial step in the extension process and typically takes about 1 to 2 weeks. The duration depends on the ground conditions and the foundation type.

Q: How Long Does It Take to Build a Roof Extension?

Building a roof extension can take between 10 and 14 weeks. This includes the time needed to prepare the structure, reinforce the existing roof, and install any additional features such as dormer windows. KT5 Construction has extensive experience in roof extensions, ensuring the work is done safely and within the expected timeframe.

Q: How Long Does Brickwork Take on an Extension?

Brickwork typically lasts between 2 and 4 weeks, depending on the size of the project.

Q: Is Building an Extension Stressful?

Building an extension can be a stressful process, especially when dealing with multiple contractors and ensuring that everything runs smoothly. At KT5 Construction, we strive to alleviate this stress by offering a people-first approach. We maintain clear communication throughout the project, addressing concerns promptly and ensuring all work is completed to your satisfaction.

Q: What Time of Year is Best to Build an Extension?

The spring and summer months are generally considered the best time to build an extension due to the better weather. However, at KT5 Construction, we operate year-round and can adjust project timelines to accommodate weather conditions, ensuring quality work regardless of the season.

Why Choose KT5 Construction Ltd.?

At KT5 Construction Ltd., we understand that House Extension is a major investment. That’s why we’re committed to delivering the highest levels of quality and service for every project, no matter the size. With years of experience across London and Surrey, our Skilled team can handle everything from small updates to full ground-floor extensions, ensuring a smooth and stress-free renovation.

Here’s why homeowners trust us:

        • Expert Craftsmanship: Our team prides itself on attention to detail and expert workmanship. We ensure every element of your renovation is finished to the highest standard.
        • Tailored Solutions: We know every home is different. That’s why we offer bespoke renovation solutions, designed to meet your specific needs and style preferences.
        • Transparency and Communication: At KT5 Construction, communication is key. We keep you informed every step of the way, ensuring there are no surprises—just exceptional results.
        • Comprehensive Service: From initial design consultation to the final installation, we manage the entire renovation process, so you don’t have to worry about juggling multiple contractors.

When you choose KT5 Construction, you’re choosing a team that’s dedicated to making your vision a reality. Contact us today to start planning your dream Extension.

Conclusion

Building an extension is a significant investment, and understanding how long the process takes is crucial for planning. At KT5 Construction, we bring expertise and reliability to every project, whether you’re extending your ground floor, adding a roof extension, or undergoing a complete renovation. Contact us today for a consultation, and let us help you transform your home.

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