What is The Average Cost of a Bungalow Extension?

Looking into extending your bungalow, but want to learn the average prices of extensions first? You’ve come to the right place…

If you love your bungalow home and location but feel a little tight for space, you’re not alone. The idea of moving home is daunting – not to mention the added costs!

In fact, many homeowners across the West Midlands reach a point where moving feels like too much upheaval, but staying put means needing more room.

So the big question is: what is the average cost of a bungalow extension, and is it worth the investment for you and your family?

Understanding the prices can help you plan realistically, avoid surprises and decide whether now is the right time to build. 

That’s why we here at West Midlands Building Company have created this handy guide to answer all your questions about bungalow extension prices, including factors that determine the costs, prices by extension type and how to know when to build. 

What is a Bungalow Extension?

To start things off, let’s define exactly what a bungalow extension is. 

A bungalow extension adds new living space to your existing home, allowing you to expand a pre-loved space and create a new room entirely.

So, why could your home need a bungalow extension? Homeowners often use bungalow extensions for:

• Open-plan kitchen 
• Dining room expansion
• Utility room/boot rooms
• Living room level up
  Downstairs bathrooms or shower rooms
• Garden-facing family rooms

In short, bungalow extensions give you room to breathe without the upheaval of moving house, and for a small amount of the overall cost!

How Much Does a Bungalow Extension Cost In The UK?

So, let’s talk costs – what is the average cost of a bungalow extension?

The average price of a bungalow extension is £1,250 to £4,000 per m², so prices can vary widely. An average cost would be between £30,000 and £180,000.

While this is a rough benchmark for today’s market, the figure will vary widely between individual homes. The cost of a bungalow extension can rise or fall depending on design choices, site conditions and where you live in the country.

What Determines The Cost Of A Bungalow Extension?

Although it’s good to have a benchmark, your actual bungalow extension cost will be shaped by several core factors – and this is where the detail really matters.

Key factors include:

• Size: Larger bungalow extensions naturally cost more due to increased materials, labour and time. Even an extra metre can significantly affect the final figure, so being clear about what you need from the outset is essential.
• Type of Extension: Whether you’re extending to the rear, the side or converting the loft space above, the approach you take has a huge bearing on the overall price. A straightforward rear extension is typically more predictable in cost, whereas a wraparound or double-storey addition is more complex. 
• Groundworks Required: Bungalows often sit on older foundations, so poor soil conditions, drainage changes or the need for deeper footings can lead to unexpected costs early in the project.
• Quality of Fittings & Fixtures: A basic finish keeps costs down – ideal for a utility room or additional bedroom – while a high-spec kitchen-diner, bespoke joinery or luxury bathroom will push the budget up.
• Location: Build costs vary across the UK. In the West Midlands, prices are generally more competitive than in London or the South East, though they still depend on local labour availability and site access.

Additional Factors That Influence Your Bungalow Extension Cost

Beyond the core build, there are several other elements that bungalow owners often overlook when budgeting. These include:

• Timescales

How quickly you need the work completed can affect the overall price. Accelerated programmes often require more trades on site simultaneously, which can push labour costs up.

• Labour Costs

Skilled tradespeople command a premium. Higher-quality workmanship may cost more upfront, but it saves money in the long run by reducing the risk of defects or rework.

• Site Survey

A thorough survey helps identify potential issues before work begins, protecting you from costly surprises mid-build. It’s a step that’s easy to overlook, but one that pays for itself.

• Architect Fees

A good architect doesn’t just draw plans – they help maximise light, space and the long-term value of your home. It’s an investment worth making, but one to factor into your overall budget.

• Planning Applications & Building Regulations

Depending on the scale of your bungalow extension, you may need full planning permission or permitted development approval. 

• Materials

From blockwork and insulation to structural steelwork, your material choices affect both the build cost and the extension’s long-term performance.

• Doors & Glazing

Bi-fold or sliding doors are a popular choice for bungalow extensions, particularly for rear extensions opening onto a garden, but they come at a premium.

• Flooring

Tiles, engineered wood or underfloor heating all carry different price points. Underfloor heating is particularly popular in bungalow extensions, where there’s no upper floor to factor in.

• Heating & Electrics

Tying into your existing systems or installing new ones adds to the budget, especially if the extension is a standalone space requiring its own circuits or heating zones.

• Style of Room

A simple spare bedroom costs far less to finish than a full open-plan kitchen-diner designed for entertaining. The intended use of the space has a significant bearing on the final bill.

• Individual Tradesmen Costs

Plumbers, electricians, plasterers and decorators all contribute separately to the overall cost, so make sure these are all accounted for when reviewing quotes.

How Much Does A Roof Cost For A Bungalow Extension?

Because bungalows are single-storey, the roof is one of the most visible and impactful elements of any extension. Typical costs include:

• Flat Roof: £3,000 – £6,000+ (on average)

A cost-effective and contemporary option, particularly well-suited to rear bungalow extensions where a low-profile finish complements the existing roofline.

• Pitched Roof: £5,000 – £10,000+ (on average)

The traditional choice for bungalow extensions, a pitched roof blends seamlessly with the existing structure and is ideal for mid-range budgets.

• Glazed Roof or Roof Lantern: £6,000 – £12,000+ (on average)

A popular option for bungalow owners who want to flood a new living space with natural light. Higher in cost due to specialised materials, but transformative in how the space feels day-to-day.

Choosing the right roof isn’t just a budget decision – it’s about how you want to live in the space. If you’re dreaming of light pouring in on a Sunday morning, a roof lantern could be the finishing touch that makes the whole project worthwhile.

Bungalow Extension Cost FAQs

What’s The Average Cost Of A Rear Bungalow Extension? 

A rear bungalow extension typically costs between £30,000 – £50,000+, depending on size, finish, and structural requirements.

What’s The Average Cost Of A Wraparound Bungalow Extension? 

Wraparound extensions are more complex and generally cost £50,000 – £80,000+, due to increased structural work and a larger overall footprint.

What’s The Average Cost Of A Front Bungalow Extension? 

Front extensions are less common and frequently require full planning permission. Costs typically start from £35,000+, depending on design and local authority requirements.

What’s The Average Cost Of A Side Bungalow Extension? 

A side extension on a bungalow generally costs £35,000 – £60,000, with final figures influenced by access, drainage work and whether it’s combined with a rear extension.

What’s The Least Expensive Type Of Bungalow Extension? 

A small rear extension with a flat roof and standard finishes is typically the most cost-effective route. This is a great choice if you want to meaningfully expand your living space without overstretching the budget.

Ready To Extend Your Bungalow?

Here at West Midlands Building Company, we’ve helped hundreds of bungalow owners across Birmingham and the wider West Midlands unlock the full potential of their homes. With over 150 positive Google reviews, we’ve built a reputation as one of the region’s most trusted and customer-focused building companies.

We also offer a range of flexible finance options, including buy-now-pay-later plans — and at the time of writing, we’re the only provider in the West Midlands offering finance terms of up to 20 years on conservatory projects.

Thinking about extending your bungalow? Get in touch with our friendly team today for a FREE, no-obligation quote and advice on your next steps.