WHY CHOOSE US?

Why Choose Hawksbeck Annexes for Your Custom Garden Annexe?

At Hawksbeck Annexes, we have dedicated years to researching and developing the construction of our annexes. Our team has collaborated extensively with structural engineers, architects, and manufacturers in the industry to ensure that every Hawksbeck annexe is built to perfection.

We take immense pride in using cutting-edge materials known as SIPs (Structurally Insulated Panels) in the construction of our annexes. These panels offer unparalleled strength, exceptional insulation, and incredible speed of construction.

In a matter of days, you can have a fully built and ready-to-use annexe on your property. But our commitment doesn’t end with construction.

We believe in providing exceptional customer service and managing every aspect of your annexe project with our team of architects, project managers and contractors.

Our comprehensive approach covers everything from design to groundworks, electrics, and plumbing if required.

We even take care of clearing and preparing the site, ensuring a hassle-free experience for you.

Discover Why our Clients Chose Hawksbeck Annexes

Building Regulation Compliant

10 Year Warranty

environmentally sustainable garden annexes

Environmental Sustainability

Speedy Construction

Turnkey Solution

James & Emily

“We are delighted with our garden room, which we intend to use as guest accommodation and to let through AirBNB. It is finished to an incredibly high standard, and we were so impressed with Jon and his team.”

“Jon’s diligence and thoroughness reassured us throughout the project, and the end product is of better quality and at a lower cost than the pre-fabricated garden room options.”

Richard

“From the very beginning, Hawksbeck have been fantastic. Our project required the use of all their services and all teams were highly skilled, friendly and professional. Whenever we had a question, there was always someone available straight away to help.”

“We love our new garden room, not only has it transformed our garden but has also given us more living space in the house. We would thoroughly recommend using Hawksbeck to anyone.”

Nik & Rita

“Our project with Hawksbeck was a journey that began over 2 years ago, and Jon and the team were there with us throughout. We had many Garden Building companies come out to see us, but none of them offered the same service that Hawksbeck provide, making them unique – if you are after a team that manage the project for you from the start (where it is just an idea, the planning applications and the design iterations) to the completion (an amazing usable, quality and robust build) then look no further.”

Hawksbeck Annexes is proud to offer our exceptional range of services across South East England, bringing our expertise and passion for bespoke living spaces to homeowners in the region. Our dedicated team is ready to guide clients through every stage of the process, from initial consultation to the final finishing touches.

Whether you're looking to expand your living space, create a granny annexe or simply increase your property value, Hawksbeck Annexes is here to transform your dreams into reality.

Discover the footprint of excellence with Hawksbeck Annexes' projects mapped out for your exploration.

Each pin represents a bespoke Hawksbeck annexe or garden room, custom-built to our clients’ requirements and desires.

Explore our portfolio as we continue to create remarkable new living spaces with as many delighted homeowners.

Revolutionising Annexe Construction

At Hawksbeck, we are proud pioneers in the annexe construction industry, revolutionising the way garden annexes are built. We have set a new standard by utilising structurally insulated panels (SIPs) to create a far superior product compared to standard builders.

SIPs are composed of an insulating foam core sandwiched between two robust structural facings. This ground-breaking construction method results in garden annexes that are 7 times stronger than timber frame structures and 3 times stronger than traditional brick buildings.

While builders typically rely on conventional methods, we embrace innovative technology to ensure strength and durability.

At Hawksbeck, we go above and beyond by surpassing UK Building Regulation Standards with our garden annexes. If desired, we can even coordinate with building inspectors on your behalf to ensure that your annexe achieves the necessary approvals, giving you complete peace of mind.

Every structural aspect of a Hawksbeck garden annexe has received BBA approval. Our Structurally Insulated Panel System (SIPS), including the walls, floor, and roof, proudly holds certification from the BBA.

Furthermore, our foundations and plasterboard have also earned BBA approval, attesting to the rigorous testing our materials undergo to meet the highest standards.

Hawksbeck Annexes for superior garden rooms

Each and every one of our annexes is designed bespoke to your requirements. Let us be your trusted partner in creating a dream annexe that combines durability, aesthetics, and exceptional value.

FAQs

Do I need planning permission to build a garden annexe?

Yes – unlike our standard garden rooms, most garden annexes require planning permission because they include living accommodation (sleeping, bathing, cooking). They are classified as separate dwellings under planning law, even when built within your own garden.

But don’t worry, Hawksbeck Annexes handles the entire planning process for you, from drawings to submission, ensuring the design meets all local requirements. Our team has an excellent approval rating and years of experience navigating planning policies.

Do I need permitted development rights for a garden annexe?

Permitted Development (PD) typically applies to outbuildings for non-residential use (e.g. a home office or a garden gym). Garden annexes used for living purposes do not qualify under Class E of PD rights – meaning you’ll need full planning permission.

However, we recommend applying for a Certificate of Lawful Use in some cases – for example, if the annexe is used solely as ancillary accommodation for a family member. Hawksbeck will advise on the best route based on your needs.

Do building regulations apply to garden annexes?

Yes, all Hawksbeck annexes must comply with UK Building Regulations, since they are designed for year-round living. We ensure your annexe meets standards for:

Fire safety
Structural integrity
Energy performance
Drainage and plumbing
Accessibility (where relevant)

Our garden annexes are inspected and certified by an approved inspector to give you peace of mind.

How close to my boundary can I build a garden annexe?

Under planning rules, you can build close to boundaries, but height and fire safety restrictions will apply.

If your annexe is within 2 metre of a boundary and over 15m², it must be built using non-combustible materials.

The maximum height is usually 2.5m within 2m of the boundary, unless planning permission allows more.

Our expert design team ensures your garden annexe complies with all spatial and safety limits, even in tight spaces.

Are garden annexes allowed in conservation areas or near listed buildings?

Yes, but they are subject to stricter controls:

In conservation areas, your annexe design must respect the character of the surroundings. You may need to avoid timber cladding or modern materials.

For listed buildings, planning permission and potentially Listed Building Consent will be required – even if the annexe is detached.

We specialise in navigating these sensitive applications, offering bespoke annexe designs that comply with all heritage requirements.

How long does it take to build a Hawksbeck annexe?

A standard Hawksbeck garden annexe can be completed in 4–6 weeks after groundwork, depending on size and specification. We provide a clear timeline during your free survey, and our build team works efficiently to minimise disruption.

What materials and finishes are available for my garden annexe?

We offer fully bespoke finishes for your annexe, including:

Cladding: Cedar, Fraké Noir, composite, or brick
Roofs: Flat, pitched, gable; EPDM, zinc, slate, or green roof options
Windows/Doors: Aluminium, uPVC, Crittall-style, bi-folds, French doors
Flooring: Luxury vinyl, engineered wood, polished concrete, tiles

Every detail is tailored to your taste and the character of your property.

What is the average cost of a garden annexe?

A fully equipped Hawksbeck annexe starts from £65,000 to £95,000+, depending on size, finishes, and included features like kitchens or bathrooms.

We offer a free site survey and tailored quote with no hidden costs. Every quote clearly itemises:

Design & planning support
Construction and groundworks
Utilities, fittings, finishes
Project management and aftercare

Does a garden annexe add value to my property?

Yes, a well-built annexe can significantly increase your property’s value and appeal, especially as:

Independent space for relatives or guests
Rental income opportunity (subject to permission)
Future-proofed home office or accessible accommodation

Do you offer financing for your garden annexes?

While Hawksbeck does not currently offer in-house financing, many clients fund their annexe through:

Personal savings
Home improvement loans
Mortgage extensions or equity release

We’re happy to provide supporting documents to help with any loan or mortgage application.

How much maintenance does a garden annexe require?

Hawksbeck annexes are built for long-term use with minimal upkeep. Basic care includes:

Cleaning windows and cladding annually
Gutter checks and roof inspections
Optional re-oiling of timber (if applicable)

We offer aftercare advice and optional servicing for long-term peace of mind.

What warranties do Hawksbeck annexes come with?

All of our garden annexes come with:

10-year structural warranty (IWA-backed)
Manufacturer warranties on windows, doors, roofing
Optional warranties on flooring and appliances

Your warranty pack is included on completion for total confidence in your investment.

Do you have any other questions?

We’d love to talk. Whether you’re planning a garden annexe for family, work, or rental use, our team is here to help from concept to completion.

For A Free Garden Annexe Site Survey Call Us On 01277 414586



Hawksbeck Annexes

Ground Floor
Kings House
101-135 Kings Road
Brentwood
Essex
CM14 4DR



Essex

01277 414586



Buckinghamshire

01296 926107



info@hawksbeckannexes.co.uk

Call Us

Email Us