If you’re weighing up a house extension in Nuneaton, Hinckley, Coventry or anywhere across Warwickshire, one of the biggest decisions you’ll face early on is whether to go single-storey or double-storey. Both can transform a home — but they don’t deliver the same return on investment, and they don’t suit every property.
As builders working across the Midlands every day, Parker Grears Developments helps homeowners weigh up this exact question. The honest answer is: it depends on your home, your budget, and what you’re trying to achieve. Below, we break down the trade-offs so you can make an informed choice.
What’s the Cost Difference?
The headline figure most homeowners want to know first is cost. Roughly speaking, a double-storey extension typically costs around 50–60% more than a single-storey extension of the same footprint — not double, as many people assume.
Why? Because the most expensive elements of any extension — foundations, drainage, roof, and site setup — are largely shared between both floors. Adding a second storey mainly adds brickwork, internal joinery, plastering, and finishes. The fixed costs are amortised across more square metres.
A typical 4m × 5m single-storey rear extension in Nuneaton might cost in the region of £55,000–£75,000 fully finished. The same footprint as a double-storey extension would typically come in at around £85,000–£115,000 — but you’d be getting roughly double the floor space.
On a per-square-metre basis, double-storey is significantly cheaper. That’s the first thing to understand.
Which Adds More Value?
In terms of resale value, the rule of thumb in the Midlands market is straightforward: bedrooms add more value than living space.
A double-storey extension typically delivers a new bedroom and en suite or family bathroom upstairs, which can move your home up a price bracket — particularly important in family-focused areas like Hinckley, Atherstone, Market Bosworth, and Lutterworth where 4-bed and 5-bed homes command a notable premium over 3-beds.
A single-storey extension, by contrast, usually creates a larger kitchen-diner or open-plan living area. This is highly desirable to buyers and improves quality of life, but the value uplift is generally lower in pure pound-for-pound terms.
That said, two important caveats:
- Ceiling values matter. If your street caps out at, say, £450,000, no extension will push your house above that ceiling for long. It pays to look at recent sold prices on your street before committing.
- Quality of finish trumps size. A beautifully executed single-storey extension will outperform a poorly finished double-storey every time.
Planning Permission and Permitted Development
Single-storey extensions often fall under Permitted Development Rights (PDR) — meaning you can build without a full planning application, provided you stay within the size and height limits set by the government. Under the Larger Home Extension scheme, single-storey rear extensions can extend up to 6m from the original rear wall on a semi-detached property and 8m on a detached, subject to a neighbour consultation.
Double-storey extensions are far more restricted under PDR. You can build a two-storey rear extension up to 3m deep and not within 7m of the rear boundary — but in practice, most two-storey extensions in Warwickshire require a full planning application, particularly in conservation areas or where the council has tightened permitted development rights through an Article 4 direction.
This means a double-storey extension typically takes 8–12 weeks longer at the planning stage. If you’re in a hurry, single-storey is usually faster to get off the ground.
Build Time and Disruption
A single-storey rear extension on a typical Nuneaton home takes around 12–18 weeks on site once groundworks begin. A double-storey extension of the same footprint usually adds another 4–6 weeks, taking total build time to around 16–24 weeks.
Disruption is also more significant with a double-storey:
- An upstairs window or wall is often removed to tie the new structure into the existing house, exposing bedrooms to weather temporarily.
- Scaffolding stays up for longer.
- Roofing work is more complex, particularly where the new roof has to tie into an existing pitched roof.
If you have young children, plan to live on-site through the build, or have a tight timeline before a major life event, the extra disruption of a double-storey is worth factoring in.
When Does a Double-Storey Make More Sense?
A double-storey extension is usually the better choice when:
- You need more bedrooms (e.g. growing family, working from home, ageing parents moving in)
- Your plot is narrow and you can’t afford to lose more garden space
- Your home is already at the lower end of your street’s price bracket and adding bedrooms could push it into a higher comparison group
- You’re staying in the home long-term and want maximum lifestyle uplift
A single-storey extension is usually the better choice when:
- You’re focused on a kitchen-diner, family room or open-plan living space
- You want to avoid full planning permission where possible
- You have a generous garden and don’t mind losing 20–25m² of it
- Your home already has enough bedrooms for your needs
- You want a faster, less disruptive build
What About Side Extensions and Wraparounds?
It’s worth mentioning that the choice isn’t always strictly single vs double. Wraparound extensions combine a rear and side extension into one project, and side return extensions are common on Victorian or Edwardian terraces. In Coventry, Kenilworth, and parts of Solihull and Balsall Common, we see a lot of wraparounds because they make excellent use of awkward L-shaped plots.
If you’re not sure which configuration suits your home best, a good local builder can walk the site with you and sketch out the options before you commit to anything.
So, Which Adds More Value?
The short answer: double-storey extensions almost always add more value per pound spent, particularly where they add a bedroom and bathroom. But that doesn’t make them the right choice for every home or every homeowner.
The best extension is the one that solves the actual problem you have — whether that’s lack of bedrooms, a cramped kitchen, or simply not enough usable family space. Trying to maximise resale value at the expense of how you live in the home day-to-day is rarely the right call.
Get Expert Advice on Your Nuneaton or Warwickshire Extension
Choosing between a single-storey and double-storey extension is a decision that pays to get right first time. At Parker Grears Developments, we offer free consultations where we’ll walk through your property, talk through your goals, and give honest advice on which approach fits best — including realistic costs and timelines for both options.
We’re FMB Approved, SMSTS Certified, and provide a 10-Year Guarantee on all our work. We serve homeowners across Nuneaton, Hinckley, Coventry, Atherstone, Rugby, Kenilworth, Stoke Golding, Market Bosworth, Ashby-de-la-Zouch, Balsall Common, Solihull, Tamworth, Lutterworth, and the wider Warwickshire area.
Ready to talk it through? Contact us today for a free, no-obligation consultation and we’ll help you decide which extension is right for your home.
