Thinking about expanding your living space? A house extension is one of the most effective ways to transform your home, add value, and avoid the hassle of moving. But one common question we get at SDS Builders is: Should I go for a rear extension or a side extension?
Both options can offer fantastic benefits, but choosing the right one depends on your property, lifestyle needs, and budget. In this guide, we’ll break down the key differences, pros and cons, and help you decide which type of extension is right for your home.
What Is a Rear Extension?
A rear extension is built onto the back of your property, typically extending out into the garden. It’s ideal for homeowners with generous outdoor space who want to create a large open-plan area, such as a kitchen-diner, family room or even a home office.
Benefits of Rear Extensions:
- Maximise garden views – great for bifold or sliding doors
- Open-plan living – ideal for modern lifestyles
- Light-filled rooms – skylights and large windows bring in natural light
- Great for entertaining – seamless flow to outdoor space
What Is a Side Extension?
A side extension fills in the unused space at the side of your home, often seen in semi-detached or end-of-terrace properties. It’s a smart choice if your garden space is limited but you still want to gain extra internal space.
Benefits of Side Extensions:
- Utilise dead space – make the most of narrow side returns
- Preserve garden area – ideal if outdoor space is precious
- Perfect for extra rooms – such as utility rooms, cloakrooms or small studies
- Less impact on neighbours – often easier to gain planning approval
Rear vs Side: Which Extension Is Right for You?
| Feature | Rear Extension | Side Extension |
| Space Needed | Requires larger garden | Uses narrow side return |
| Typical Uses | Kitchen-diner, open-plan | Utility room, cloakroom, study |
| Natural Light | Excellent with large glazing | Can be improved with skylights |
| Planning Permission | May be easier under permitted development | May need permission depending on width |
| Budget | Usually higher cost due to size | Often more affordable |
Considerations Before Choosing
When planning your extension, think about:
- Available outdoor space – Will you sacrifice too much garden?
- Your lifestyle – Do you need large open-plan space or just extra functionality?
- Budget and timeframes – Larger projects cost more and take longer
- Planning constraints – Conservation areas or terraced properties may have restrictions
At SDS Builders, we’ll guide you through every step – from planning permission to final sign-off – ensuring your extension meets both your needs and all local regulations.
Why Choose SDS Builders for Your House Extension?
With over 20 years’ experience in home extensions across Surrey, SDS Builders delivers high-quality craftsmanship, transparent communication, and full project management. Whether you choose a side or rear extension, we’ll tailor the design and build to suit your home and vision.
✅ Free initial consultation
✅ Trusted local team based in Surrey
✅ Fully insured and guaranteed work
✅ Start-to-finish project support
Ready to Extend Your Home?
Request a free quote today or speak to our expert team about your extension ideas. We’ll help you make the right decision and bring your dream space to life.
Frequently Asked Questions
What’s cheaper: a rear or side extension?
Side extensions are typically more affordable due to their smaller size, but costs vary depending on design and access.
Do I need planning permission for a rear or side extension?
Many single-storey extensions fall under permitted development, but it’s best to check with your local authority or speak to us directly.
Will I lose too much garden with a rear extension?
That depends on your current garden size. We’ll help you find the right balance between indoor and outdoor space.
Can I combine a side and rear extension?
Yes, a wraparound extension combines both and offers maximum space – it’s ideal for larger renovations.
How long does a house extension take?
Most single-storey extensions take 10–16 weeks depending on size, complexity and weather.