Are you planning to increase your living space with a house extension in Westminster? Whether you are considering a rear extension, side return extension, single-storey, or double-storey extension, our experienced team delivers tailored solutions that enhance both space and property value.

We manage the entire house extension process, from early design advice and planning permission through to building regulations approval, construction, and final finishes. Our professional house extension builders in Westminster ensure a structured, efficient, and stress-free experience, delivering extensions that integrate seamlessly with your existing property.

Why Choose Redline for House Extensions in Westminster

Choosing the right house extension company is especially important in Westminster, where planning controls, conservation areas, and building regulations are often more complex. Homeowners trust Redline Building Services because we deliver clarity, compliance, and consistent quality.

Bespoke House Extensions: Designed around your property and lifestyle
Complete Project Management: With a dedicated point of contact
Expert Planning & Design: Building regulations, and party wall matters
High-Quality Construction: Using durable, suitable materials
Competitively Priced: Transparent and competitive pricing with no hidden costs
Extensive Experience: Extensive experience in residential extensions and home renovations

We oversee every stage of your house extension project, ensuring quality control, clear communication, and full regulatory compliance.

Types of House Extensions We Offer

Many Westminster properties face space constraints, particularly period homes, apartments, and townhouses. Extending your property is often a more practical alternative to moving, allowing you to improve layout and functionality while remaining in a prime location.

Rear House Extension

A rear house extension is ideal for creating additional living space at the back of your property. This type of extension is commonly used for open-plan kitchen renovations, dining areas, or additional living rooms. Our rear extensions in Westminster are carefully designed to respect the existing building while maximising natural light.

Side Return Extensions

A double-storey extension provides significant additional space across two levels. This type of extension allows homeowners to add bedrooms, bathrooms, or expanded living areas while increasing property value. Our double-storey house extensions in Westminster are designed to meet planning requirements and maintain architectural balance.

Double-Storey Extensions

Single-Storey Extensions

A single-storey extension offers a flexible and efficient way to expand your home. Whether you need a larger kitchen, a home office, or a new living area, single-storey extensions can be tailored to suit both traditional and contemporary Westminster properties.

Understanding House Extension Costs & Planning

The cost of a house extension in Westminster depends on factors such as size, design complexity, materials, and planning considerations. We offer a free consultation to assess your property, understand your goals, and provide clear guidance on budgets, timelines, and feasibility.

Our team manages permitted development rules, local planning authority policies, conservation area requirements, and building control approvals. From early planning advice to construction scheduling, we provide full transparency and peace of mind.

Enhance Your Home with a Seamless House Extension Project

Whether you are extending your home to accommodate a growing household, improve day-to-day living, or add long-term value, our house extension specialists deliver high-quality results across Westminster. We work on both modern extensions and traditional renovations, ensuring efficient delivery and minimal disruption.

Our aim is to create extensions that feel like a natural continuation of your home, enhancing comfort, usability, and visual appeal.

Other Services in Westminster

Alongside house extensions, we offer a comprehensive range of building services across Westminster, delivered to the same high standards.

Kitchen Renovation Westminster

Design & Build Westminster

Loft Conversion Westminster

House Extension PROJECTS

Get Started on Your House Extension Project in Westminster

As a trusted design and build company, we make the process of extending your home straightforward and professionally managed. If you are planning a house extension in Westminster, contact us today for a free consultation and expert guidance.

Let’s bring your ideas to life with a carefully designed and expertly built house extension.

Request a free consultation

For all enquiries, please contact us by email in the first instance info@redlinebuilding.co.uk

"The Redline team was exactly what we were looking for, a reliable building company that are great to work with. They are very skilled tradesmen and always courteous. Some complex design changes and unusual finishes all taken within their stride. Highly recommended!"

THEO BULMER

“High-end finish, great communication, very flexible with an eye for detail, reliable and works to schedule. Always our first port of call for studio fit out.”

PETER JOHNSON - ONE TEN PRODUCTIOns

“We are impressed with Redline’s commitment to getting the job done on time, in budget and to the highest professional standards - often in the face of unforeseeable complications and difficult working environments.”

MD - WARREN LAND & PROPERTY

“The key to our successful relationship was Ben's unwavering attention to detail and daily presence on site. His team were able to tackle a complicated project within the constraints of a grade II listed building.”

MARC B - PENTHOUSE APARTMENT, LONDON

Transform Your Home with Bespoke House Extensions in Westminster