How Long Does a House Extension Take in Nuneaton?

If you’re planning a house extension in Nuneaton or the surrounding Warwickshire area, one of the first questions you’ll ask is: how long will it take? The honest answer depends on the size of your project, whether you need planning permission, and how prepared your builder is before work begins.

At Parker Grears Developments, we’ve completed extensions across Nuneaton, Hinckley, Coventry, and beyond — and we’re upfront about timescales from day one. Here’s a realistic breakdown of what to expect.

How Long Does a House Extension Take From Start to Finish?

Most house extensions in Nuneaton take 4 to 9 months from initial enquiry to handover. That includes the design and planning phase, any permission applications, and the physical build.

A straightforward single-storey rear extension on permitted development might take as little as 4–5 months. A larger double-storey or complex project — where full planning permission is required — is typically 7–9 months.

The build itself (once the groundwork starts) usually runs 10 to 20 weeks, depending on size and spec.

Stage 1: Initial Consultation and Design (2–4 Weeks)

The process starts with a site visit, where your builder will assess the space, discuss your goals, and give you an initial indication of cost and feasibility.

At Parker Grears, we offer a detailed Quantity Surveyor (QS) cost breakdown at this stage for £240 + VAT. This gives you a full, itemised cost before you commit to anything — so there are no surprises later. It’s a step most builders skip, but we believe it’s essential for a project of this size.

Once you’re happy to proceed, architectural drawings are prepared. This typically takes 1–3 weeks depending on the complexity of the design.

Stage 2: Planning Permission or Permitted Development (4–10 Weeks)

Whether you need planning permission depends on the size and type of your extension:

• Single-storey rear extensions under 4 metres (detached) or 3 metres (semi/terraced) usually fall under Permitted Development — no formal planning application needed.
• Double-storey extensions, side extensions, and anything larger than the PD limits will require a full planning application, which typically takes 8 weeks to be decided by Nuneaton & Bedworth Borough Council.

While planning is being processed, your builder should be preparing building regulation drawings and ordering long-lead materials — so time isn’t wasted waiting.

Stage 3: Building Regulations Approval (2–4 Weeks)

All extensions require building regulations approval regardless of whether planning permission is needed. This covers structural integrity, insulation, electrics, drainage, and fire safety.

Your builder’s structural engineer will submit the relevant drawings, and a building control officer will inspect at key stages throughout the build.

Stage 4: The Build — Our 6-Stage Process (10–20 Weeks)

Once groundwork begins, Parker Grears works through six defined build stages:

1. Site Preparation — clearing, temporary works, setting out
2. Floor Slab — foundations and ground-bearing slab
3. Structure Shaping — walls, steelwork, and structural frame
4. Watertight — roof, windows, and doors installed
5. Internal Fitout — first-fix electrics, plumbing, insulation, plastering
6. Finishing Works — second-fix trades, tiling, decorating, snagging

A typical single-storey extension takes around 10–14 weeks through these stages. A double-storey project runs 14–20 weeks.

We give every client a clear programme of works before we start, so you always know what’s happening and when.

What Can Delay a House Extension?

Even well-run projects can encounter delays. The most common causes are:

• Planning delays — objections from neighbours or requests for further information from the council
• Material lead times — bespoke windows, structural steels, and roof lanterns can take 6–10 weeks to arrive
• Groundwork surprises — unexpected ground conditions, drains, or tree roots
• Change of scope — design changes mid-build add time and cost

The best way to avoid delays is to appoint an experienced, organised builder who plans ahead. At Parker Grears, we identify risks early and order materials in advance so the build programme stays on track.

A Real Example: Nailstone Two-Storey Extension

One of our recent projects in Nailstone involved a full two-storey side extension valued at approximately £155,000. From the initial site visit to final handover, the project was completed within programme — with the client kept informed at every stage through our project management process.

Ready to Get Started?

If you’re thinking about extending your home in Nuneaton, Hinckley, Coventry, or anywhere across Warwickshire, Parker Grears Developments can give you a clear, honest picture of timescales and costs from the very first meeting.

Call us on 07731 015784 or request a free consultation — we’ll visit your home, assess the project, and give you a straightforward plan with no pressure and no hidden costs.

Parker Grears Developments Ltd — FMB members, SMSTS certified, and fully insured to £10M.