Single Storey House Extensions in Essex
Running out of living space but don’t want the hassle of moving? A single storey house extension creates the extra room you need, whether it’s a kitchen-diner, garden room, or family hub, all designed and built around your lifestyle.
Book your free single-storey extension consultation today.
Transforms your space
Create open-plan kitchen-diners, family areas or home offices.
Adds long-term value
A high-quality extension can add 15–25% to your property’s value.
Improves energy efficiency
Modern materials, glazing, and insulation reduce energy waste.
What is a Single Storey House Extension
A single storey extension adds a new ground-floor space to your property, extending outwards into the garden, side return, or courtyard area. It’s one of the most versatile and cost-effective ways to increase your home’s footprint and often used to extension your kitchen or living space.
Whether you live in a terraced property in London, a semi-detached in Essex, or a detached home in Hertfordshire, a well-planned single storey extension can completely transform how you use your home, blending indoor comfort with outdoor living.
Why Choose KNR Group for Your Single Storey Extension
KNR Group has delivered hundreds of bespoke extensions across London, Essex and Hertfordshire. We manage every step, from architectural design to the final finish, so you enjoy a smooth, stress-free build.
- Over 30 years of construction experience
- In-house designers, planners, and qualified tradespeople
- Transparent, detailed quotations and timelines
- Focus on sustainability and energy-efficient materials
Contact us today to arrange your free site survey and consultation.
Types of House Extensions
Our Process
Consultation and Site Survey
We assess your property, discuss your goals, and outline potential layouts.
Architectural Design
Tailored designs that meet your space, budget, and style preferences.
Planning and Building Control
KNR Group manages all permissions, drawings and compliance paperwork.
Construction
Managed by qualified professionals, ensuring precision, safety, and efficiency.
Completion
Every project is signed off with final inspections, certification, and warranties, ready for occupancy or sale.
Cost of a Single Storey Extension
The cost depends on size, design and finishes. Typically:
| Development Type | Average Cost per m² |
| Rear extensions | £40,000–£70,000 |
| Side return extensions | £45,000–£80,000 |
| Wraparound extensions | £60,000–£100,000+ |
Factors affecting cost include materials, glazing type, roof design, and location. KNR Group provides itemised quotes so you know exactly what you’re paying for.
Planning Permission for Single Storey Extensions
Many single-storey extensions fall under permitted development rights, meaning planning permission isn’t always needed. However, homes in conservation areas or with larger designs usually require full approval. KNR Group handles all drawings, submissions, and compliance to keep your build stress-free.
FAQs – Single Storey House Extensions
What is the cost of a single storey extension in Essex?
Do I need planning permission for a single storey extension in Essex?
How long does it take to build a single storey extension in Essex??
Can a single storey extension add value to my home in Essex or London?
Yes. Professionally built single-storey extensions typically increase property value by 15–25%, especially with open-plan designs or modern kitchens.
What rooms can be added with a single storey extension?
Popular options include kitchen-diners, living rooms, garden rooms, and home offices. The space can be tailored entirely to your needs and lifestyle.
We'd love to hear from you and discuss your project
House Extensions & Renovation Projects
Client testimonials
Video Testimonial
This rear extension showcases KNR Group’s ability to deliver a smooth, well-managed build from start to finish. With clear communication and quality craftsmanship throughout, the result is a bright, open space that’s transformed how the homeowner lives day to day.