Are you planning to enhance your property with a house extension in Mayfair? Whether you are considering a rear extension, side return extension, single-storey, or double-storey extension, our specialist team delivers bespoke solutions tailored to high-value residential properties.

We manage the entire house extension process, from early design consultation and planning permission through to building regulations approval, construction, and final finishes. Our experienced house extension builders in Mayfair provide a discreet, well-managed, and stress-free service, delivering extensions that complement the character and prestige of your home.

Why Choose Redline for House Extensions in Mayfair

Choosing the right house extension company is particularly important in Mayfair, where quality, detail, and compliance are essential. Clients choose Redline Building Services because we deliver exceptional standards and complete project control.

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 manage every stage of your house extension with professionalism, discretion, and attention to detail.

Types of House Extensions We Offer

Many Mayfair properties require sensitive, well-planned extensions that enhance space without compromising architectural integrity. Extending your home can be a more practical solution than relocating, particularly in prime Central London locations.

Rear House Extension

A rear house extension is ideal for increasing living space while maintaining the elegance of the existing property. Rear extensions in Mayfair are commonly used to create open-plan kitchen renovations, dining areas, or refined living spaces that benefit from improved natural light. Our designs integrate seamlessly with the original structure.

Side Return Extensions

Side return extensions are well suited to townhouses and period properties with unused side space. This type of extension increases internal width and improves layout while preserving the property’s external appearance. Side return extensions are often used to enhance kitchens and ground-floor living areas.

Double-Storey Extensions

A double-storey extension provides substantial additional space across multiple levels. This option allows for extra bedrooms, bathrooms, or living areas while significantly increasing property value. Our double-storey house extensions in Mayfair are carefully designed to meet planning requirements and maintain architectural balance.

Single-Storey Extensions

A single-storey extension offers a refined and flexible way to expand your home. Whether you require a larger kitchen, private living space, or a bespoke entertaining area, single-storey extensions can be designed to suit both traditional and contemporary Mayfair homes.

Understanding House Extension Costs & Planning

The cost of a house extension in Mayfair depends on factors such as size, design complexity, materials, and planning considerations. We provide a free consultation to assess your property, understand your objectives, and outline realistic budgets and timelines.

Our team manages permitted development guidelines, conservation area requirements, local planning authority policies, and building control approvals. From initial advice to construction scheduling, we ensure clarity, compliance, and complete peace of mind.

Enhance Your Home with a Seamless House Extension Project

Whether you are extending your home to improve everyday living, create additional accommodation, or add long-term investment value, our house extension specialists deliver exceptional results across Mayfair. We work on both contemporary and traditional extensions, ensuring minimal disruption and a refined finish.

Our focus is on delivering extensions that feel like an original part of the property, enhancing both functionality and aesthetic appeal.

Other Services in Mayfair

In addition to house extensions, we provide a range of high-quality building services across Mayfair, tailored to premium residential properties.

Kitchen Renovation Mayfair

Design & Build Mayfair

Loft Conversion Mayfair

House Extension PROJECTS

Get Started on Your House Extension Project in Mayfair

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

Let’s create a beautifully designed, expertly built extension that enhances your Mayfair home.

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 Mayfair