Double Storey Extensions in Derby, Derbyshire More Space, More Value
Thinking about adding a double storey extension to your home? Whether you're in Derby city centre, Belper, Matlock, Ashbourne, or anywhere across Derbyshire we help families create beautiful, liveable space without the stress of moving. From your first idea to the final handover, we handle everything.
What Is a Double Storey Extension and Why Are Derby Homeowners Choosing Them?
A double storey house extension is exactly what it sounds like an addition to your home that adds living space on both the ground floor and the first floor simultaneously. Instead of building outwards on just one level, you go up as well, effectively doubling the square footage you gain for a surprisingly small increase in overall cost
For families across Derby, Ripley, Long Eaton, Heanor, and the wider Derbyshire area, this has become the single most popular way to grow a home without uprooting the family. And honestly? It makes complete sense. Moving house in Derbyshire right now comes with estate agent fees, stamp duty, solicitor costs, and the sheer exhaustion of the whole process. A well-planned double storey extension costs a fraction of that, and you end up with a home that’s been designed exactly around how your family actually lives.
What can you do with the extra space? Most Derby homeowners we work with are thinking along these lines: a larger open-plan kitchen and dining area downstairs, two or three new bedrooms upstairs perhaps a master bedroom with an en-suite, or a dedicated room for elderly parents, teenagers, or a home office. The options really are open-ended once you have that structural canvas to work with.
Why Choose a Double Storey Extension?
- Double the space from a single set of foundations and one roof
- Adds significant resale value to Derby and Derbyshire properties
- Covered by Building Regulations for structural safety and fire escape
- Far more cost-effective than a single storey extension per square metre
- Planning permission process well understood by local architects
- Minimal disruption compared to the upheaval of moving home
💡 Local knowledge matters: Derbyshire has a mix of conservation areas, terraced streets in Derby city, semi-detached Victorian homes in Ripley and Ilkeston, and newer detached properties in villages like Duffield and Quarndon. Each comes with slightly different planning considerations and we know them all.
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Double Storey Extensions on Semi Detached Houses
A huge proportion of Derby’s housing stock is semi-detached think of the streets in Chaddesden, Oakwood, Sunnyhill, or Pear Tree. Adding a double storey extension to a semi-detached house is absolutely achievable and extremely popular. The key considerations are boundary distances, the impact on your neighbour’s natural light, and whether the design maintains a sympathetic relationship with the adjoining property. Our architects have handled hundreds of these projects and know exactly how to design extensions that sail through planning.
Converting a Single Storey Extension to a Double
Already have a single storey extension but need more space upstairs? Converting an existing single storey extension to a double is often more economical than you’d expect. The groundwork is already there what’s needed is structural assessment, new roof removal, and the addition of the first-floor structure. It’s a project we do regularly across Derbyshire and can significantly increase your property’s footprint without starting from scratch.
🏠 Ideas for your extension: Open-plan kitchen-diner on the ground floor with bifold doors to the garden, master bedroom suite upstairs with a Juliet balcony, two children’s bedrooms, and a family bathroom — this is one of the most requested layouts we see from Derby homeowners right now.
Types of Double Storey Extensions We Build in Derbyshire
Not all double storey extensions are the same. The right type for your home depends on your property layout, your garden space, and what your local planning authority will approve. Here’s a clear breakdown of what’s available to Derbyshire homeowners:
Rear Double Storey Extension
The most popular choice for Derby homes. Extends into the back garden on both floors. Excellent for permitted development and causes the least visual change to the street frontage. Ideal for semi-detached houses in areas like Allestree, Chellaston, and Littleover..
Side Double Storey Extension
Perfect if you have side access or a wider plot. Common on detached and semi-detached homes across Derbyshire. Makes your home noticeably wider and can accommodate a garage conversion at the same time. Popular in Duffield, Quarndon, and Breadsall.
Wraparound Double Storey Extension
Combines rear and side extensions for maximum space gain. These are larger projects that typically require full planning permission, but the results are transformative. Often chosen by families in Matlock, Ashbourne, and Bakewell.
Front Double Storey Extension
Less common but sometimes the best fit for certain property types. Requires planning permission as it changes the street elevation, but adds real kerb appeal. We've completed several in the Derbyshire Dales area where plot configurations suit this approach.
How Much Does a Double Storey Extension Cost in Derby?
Let’s be straightforward about this, because cost is usually the very first question and the internet is full of vague, unhelpful answers. Here’s what double storey extension costs actually look like in Derby and Derbyshire in 2025.
The short answer: most double storey extensions in this area cost between £1,500 and £2,200 per square metre. A typical family project around 40-60m² over two floors therefore lands somewhere between £65,000 and £130,000 depending on specification, materials, and complexity
How Much Value Does a Double Storey Extension Add?
In the Derby and Derbyshire property market, a well-executed double storey extension typically adds between 20% and 30% to a home’s value. On an average Derby property valued at £250,000, that’s an uplift of £50,000 to £75,000 — often exceeding the cost of the extension itself. Add an extra bedroom or two and you can shift your property into an entirely different buyer bracket, which makes an even bigger difference.
How It Works Our Process for Derby Homeowners
We’ve refined our process over hundreds of projects across Derbyshire. Here’s exactly what happens from your first enquiry to the day you walk into your new space:
We visit your property anywhere in Derby or Derbyshire — Belper, Long Eaton, Ilkeston, Heanor, wherever you are. We look at your space, talk through your ideas, and give you an honest assessment of what's achievable within your budget. No commitment required.
Our in house double storey extension architects produce detailed floor plans and drawings. You'll see exactly what your new home will look like before a single brick is laid. We'll incorporate your ideas and refine the design until it's exactly right.
We manage the entire planning permission process with your local Derbyshire council. Our 98% success rate comes from designing sympathetically and knowing what each authority expects. We keep you updated throughout no chasing required on your part
Our experienced Derbyshire-based building team gets to work. Your dedicated project manager oversees every stage — from foundations to roofing to final plastering. Regular site visits, clear timelines, and transparent communication throughout. Most double storey extensions take 12–20 weeks to complete.
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Frequently Ask Questions
A double storey extension in Derby typically costs between £1,800 and £2,500 per m². A standard 30m² double storey extension will cost roughly £55,000–£75,000 fully finished.
Yes, it is one of the most common projects in Derby. Rear and side double storey extensions both work well on semi-detached properties.
A well-built double storey extension can add 20–25% to your property value in Derby and Derbyshire.
All double storey extensions must comply with Building Regulations covering structural integrity, fire escape routes, insulation, and drainage. Your builder submits these on your behalf
Yes, in most cases. Double storey extensions require full planning permission from Derby City Council. Permitted development rights do not cover two-storey builds.
Most double storey extensions take 16-24 weeks from groundworks to completion, depending on size and specification.
Yes. You share foundations and roof costs across two floors, making double storey extensions 30% to 40% more cost-effective per m² than building single storey.
Rear extends from the back of the house. Side fills the gap beside the property. Wraparound combines both, maximising space on corner or end-of-terrace plots.
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