When you're planning a single-storey extension for your home, one of the first questions that likely comes to mind is, How long will it take? Knowing the timeline helps you manage your expectations, plan your daily life, and coordinate with builders.
While the exact timeline can vary depending on factors such as size, complexity, and unforeseen challenges, this guide breaks down a typical project into key stages to give you a clear idea of what to expect.
1. Planning and Design Stage
(4–8 weeks)
Before any construction begins, there’s the crucial stage of planning and design. During this phase:
Initial Consultation: Meet with architects or designers to discuss your needs and get a clear understanding of the space you want to create.
Drawings and Plans: Architects prepare detailed drawings for approval.
Planning Permission and Permitted Development: Depending on the scope of the extension, you may need planning permission. If it falls under permitted development, you can skip this step.
Structural Calculations: A structural engineer may be needed to ensure the build will be safe and compliant.
2. Approval and Pre-Construction Preparation
(6–12 weeks)
This phase involves securing permissions and getting ready for construction:
Planning Approval: If required, planning permission applications can take up to 8 weeks for approval.
Building Regulations: Approval from Building Control may also take several weeks.
Contractor Scheduling: Once approvals are in place, your builder will schedule your project into their timeline.
3. Site Preparation
(1–2 weeks)
When the work begins, the first step is preparing the site:
Clearing the Area: Any demolition, removal of old structures, or clearing of obstacles happens here.
Marking Foundations: The footprint of the extension is marked and prepared.
4. Foundation Work
(2–4 weeks)
Laying the foundation is a critical stage:
Excavation: Builders dig trenches for the foundations.
Pouring Concrete: Foundations are laid, and time is allowed for the concrete to cure.
5. Building the Structure
(4–8 weeks)
Once the foundation is ready, the main structure goes up:
Walls: Bricklaying or other wall construction methods, depending on materials.
Roof: Adding roof trusses and tiles, making the structure weatherproof.
6. Windows, Doors, and External Finishes
(2–3 weeks)
After the main structure is built, the focus shifts to finishing the exterior:
Fitting Windows and Doors: These seal the structure and improve insulation.
Rendering or Cladding: The outer walls are finished to match your desired aesthetic.
7. Internal Work
(4–6 weeks)
The inside of the extension takes shape during this stage:
Plumbing and Electrical Work: First fix installations for water pipes, wiring, and any heating systems.
Plastering: Internal walls and ceilings are plastered, ready for decorating.
Flooring: Flooring is laid, whether it’s tiles, wood, or carpet.
8. Finishing Touches and Final Inspection
(2–4 weeks)
The final stage involves making everything move-in ready:
Decorating: Painting, installing fixtures, and other aesthetic touches.
Snagging: Addressing any minor issues or imperfections.
Inspection and Sign-Off: Building Control ensures everything meets regulations, and your project is officially complete.
Total Timeline:
4–8 months
From initial planning to completion, a single-storey extension can take anywhere from four to eight months. Larger, more complex projects may take longer, especially if delays occur due to weather, materials, or unexpected challenges.
Tips for a Smoother Process
Work with Experienced Professionals: Choose reputable architects, engineers, and builders.
Communicate Regularly: Stay in touch with your team to keep things on track.
Plan Ahead: Factor in potential delays and avoid last-minute decisions.
With the right preparation and team, your single-storey extension can transform your home and add lasting value.
If you're ready to get started, contact our expert team here today to discuss your project!
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