Single-Storey vs Double-Storey Extensions: What Works Best for Basildon Homes?
Home extensions are one of the most popular ways for homeowners in Basildon to create more space without the expense and disruption of moving. With strong demand for family homes across Laindon, Pitsea, Langdon Hills and Vange, extending an existing property is often the most practical long-term solution.
One of the biggest decisions you’ll face early on is whether to build a single-storey extension or a double-storey extension. Both options offer clear benefits, but the right choice depends on your budget, space requirements, property type and future plans.
This guide compares single-storey vs double-storey extensions in Basildon, helping you decide which option is best for your home in 2025.
What Is a Single-Storey Extension?
A single-storey extension adds space to the ground floor of your property, most commonly to the rear or side.
Popular uses in Basildon include:
- Kitchen extensions
- Open-plan kitchen-dining areas
- Family or living rooms
- Utility rooms or home offices
Single-storey extensions are particularly common in Basildon’s post-war and 1960s housing estates, where gardens often allow for rear extensions.
What Is a Double-Storey Extension?
A double-storey extension adds space across two floors, usually extending both the ground floor and first floor.
Typical uses include:
- Larger kitchens and living areas downstairs
- Additional bedrooms upstairs
- New bathrooms or en-suites
- Full family-home upgrades
Double-storey extensions are popular with growing families who need extra bedrooms but want to stay within the same Basildon neighbourhood.
Cost Comparison in Basildon
Single-Storey Extension Costs
Typically £1,800 – £2,500 per m²
Costs depend on:
- Size of the extension
- Roofing design
- Glazing (bifold doors, roof lanterns)
- Internal finishes
Single-storey extensions usually have a lower upfront cost and shorter build time.
Double-Storey Extension Costs
Typically £2,200 – £3,200 per m²
Although more expensive overall, double-storey extensions often provide better value per square metre, as foundations and roofing are shared across both levels.
Which Option Creates More Space?
Single-Storey Extensions
Best for:
- Improving ground-floor living
- Creating modern open-plan spaces
- Better flow between kitchen and garden
They work well if your main issue is a lack of living or dining space.
Double-Storey Extensions
Best for:
- Adding bedrooms and bathrooms
- Long-term family living
- Increasing total floor area significantly
If you need extra bedrooms or want to future-proof your home, a double-storey extension is often the better option.
Planning Permission in Basildon
Single-Storey Extensions
Many single-storey extensions fall under Permitted Development, meaning planning permission may not be required if size limits are respected.
They are generally:
- Easier to approve
- Less likely to face objections
- Faster to progress
Double-Storey Extensions
Double-storey extensions are more likely to require planning permission, particularly if they:
- Impact neighbouring properties
- Cause overlooking or loss of light
- Significantly alter the appearance of the home
Homes in certain areas may face additional restrictions.
Build Time and Disruption
Single-Storey Extensions
- Typical build time: 8–12 weeks
- Less disruption
- Often easier to live in the property during work
Double-Storey Extensions
- Typical build time: 16–24+ weeks
- More structural work
- Greater disruption, especially upstairs
If minimising disruption is important, a single-storey extension may be more suitable.
Which Adds More Value to Basildon Homes?
Single-Storey Extensions
- Strong lifestyle appeal
- Highly desirable open-plan layouts
- Attractive to downsizers and families
Double-Storey Extensions
- Usually add more overall value
- Increase bedroom and bathroom count
- Strong appeal to family buyers
In many parts of Basildon, double-storey extensions provide the highest long-term return, especially when they add extra bedrooms.
Which Option Is Right for Your Basildon Property?
Choose a Single-Storey Extension if you want:
- Lower initial cost
- Faster construction
- Less disruption
- A larger kitchen or living space
Choose a Double-Storey Extension if you want:
- Extra bedrooms or bathrooms
- Maximum space increase
- Better long-term value
- A full family-home upgrade
Your decision should be based on both current needs and future plans.
Why Use a Local Basildon Builder?
A local builder understands:
- Basildon’s housing stock and layouts
- Typical planning considerations
- Ground conditions and construction styles
- How to design extensions that add value locally
Working with an experienced Basildon builder ensures your extension is practical, compliant and built to a high standard.
Final Thoughts
Both single-storey and double-storey extensions are excellent options for Basildon homeowners in 2025. Whether you’re upgrading your kitchen, adding family space or increasing bedroom capacity, a well-designed extension can transform your home and boost its value.
Careful planning and professional advice will help you choose the right option for your property and lifestyle.