If you’re planning a house extension in Nuneaton or the wider Warwickshire area, one of the first questions you’ll want answered is: how long is this going to take? It’s a completely reasonable thing to want to know, you’ll need to plan around the disruption, arrange temporary living arrangements if needed, and set expectations with your family.
The honest answer is that timelines vary depending on the size and complexity of the project. But as experienced extension builders working across Nuneaton, Hinckley, Coventry, and the surrounding Midlands, Parker Grears Developments can give you a clear picture of what to expect at each stage.
Planning and Design: 4 to 12 Weeks
Before a single brick is laid, there’s important groundwork to be done. Most house extensions in Nuneaton will need either planning permission or will fall under Permitted Development Rights (PDR), which allows certain extensions without a full planning application.
If your project requires a planning application, you’re typically looking at 8 to 12 weeks for the local authority to make a decision. Permitted Development projects can move faster, but you’ll still need Building Regulations approval, which is a separate process from planning.
During this stage, your architect or designer will also be producing drawings. Depending on complexity, allow 2 to 4 weeks for this. The more detail you provide upfront about what you want, the quicker this phase moves.
Parker Grears tip: We help guide our clients through the planning process from the outset, so nothing catches you off guard.
Structural Design and Pre-Build: 2 to 4 Weeks
Once you have planning in place, a structural engineer needs to design the foundation specification and beam calculations. This is a legal requirement under Building Regulations and ensures your extension is safe and built to last.
At the same time, we’ll be finalising your build specification, ordering materials, and scheduling trades. Good builders in Nuneaton will have this pre-planned so that work begins smoothly the moment groundworks start.
Groundworks and Foundations: 1 to 2 Weeks
This is where the physical build begins. Groundworks involve excavating for the foundations, laying concrete, and installing drainage where required. For a standard single-storey rear extension, this phase typically takes one to two weeks depending on ground conditions.
Soil type matters here. In parts of Warwickshire, clay-heavy ground can require deeper or more substantial foundations, something your structural engineer will account for, but which can add a few days to this phase.
Main Build: 4 to 12 Weeks
The main build phase covers everything from brickwork and blockwork to roofing, windows, and doors. How long this takes depends primarily on the size of what you’re building:
- Small single-storey extension (e.g., a kitchen extension): 4 to 6 weeks
- Larger single-storey extension (e.g., open-plan living space): 6 to 8 weeks
- Double-storey extension: 10 to 14 weeks
During this phase your builder will be weathering the structure in, getting it watertight, before the first fix (electrics, plumbing, and carpentry rough-in) begins.
Parker Grears manages the full build process as principal contractor, meaning you have a single point of contact and no gaps between trades waiting on each other.
First Fix, Second Fix, and Finishing: 4 to 6 Weeks
Once the structure is watertight, the internal work begins. This covers:
- First fix: Electrical cables, plumbing pipes, and stud walls
- Plastering: Usually takes 1 to 2 weeks, plus drying time
- Second fix: Sockets, switches, radiators, kitchen or bathroom fitting
- Decoration and finishing: Painting, flooring, snagging
This is the phase where the space really starts to look like a room. It’s also where patience pays off, rushing plastering or joinery can compromise the final finish.
What Can Cause Delays?
Even the best-planned projects can hit the odd bump. Common causes of delays include:
- Planning permission taking longer than expected, especially if a neighbour objects
- Bad weather during groundworks or brickwork phases
- Unforeseen ground conditions once excavation begins
- Changes to the design mid-build, these can be costly in both time and money, so it pays to finalise your plans before work starts
- Slow material lead times, certain products (roof lanterns, bi-fold doors, specialist tiles) can have longer lead times
A good builder will flag these risks early and keep you updated throughout.
So, What’s the Total Timeline?
For a typical single-storey house extension in Nuneaton, from first enquiry to completion:
| Stage | Typical Duration |
|---|---|
| Planning and design | 4 to 12 weeks |
| Structural design and pre-build | 2 to 4 weeks |
| Groundworks and foundations | 1 to 2 weeks |
| Main build | 4 to 12 weeks |
| First fix, second fix, and finishing | 4 to 6 weeks |
| Total | 15 to 36 weeks |
For most homeowners, a straightforward single-storey extension takes around 4 to 6 months from planning to handover. Larger or more complex projects, including double-storey extensions, garage conversions combined with extensions, or new builds, naturally take longer.
Start Planning Your Nuneaton Extension Today
Understanding the timeline is one of the most important parts of planning a successful house extension, and it all starts with a conversation.
Parker Grears Developments are trusted builders serving Nuneaton, Hinckley, Coventry, Atherstone, Rugby, Kenilworth, and across Warwickshire. We’re FMB Approved, SMSTS Certified, and offer a 5 year workmanship guarantee as standard on all our work, with an optional 10 year insurance backed guarantee.
Ready to get started? Contact us today for a free, no-obligation consultation and we’ll walk you through exactly what your project would involve, including a realistic timeline tailored to your home.
