Watford Granny Annexe  and Garden Rooms

Granny annexes made from SIP panels (Structural Insulated Panels) are a popular and cost-effective solution for providing additional living space on a property. SIP panels are a type of building material that consists of an insulating foam core sandwiched between two structural facings, usually made of oriented strand board (OSB). This construction technique offers excellent thermal insulation, making SIP panels ideal for creating energy-efficient living spaces.

Granny annexes made from SIP panels can be designed to meet a wide range of requirements, from a simple self-contained living space to a fully equipped and fitted out apartment. The flexibility of SIP panels allows for easy customization, with options for adding additional features such as bathrooms, kitchens, and living areas.

One of the key advantages of using SIP panels for building granny annexes is their speed of construction. SIP panels are pre-fabricated in a factory and delivered to the site ready for installation. This means that construction time is reduced, making the process quicker and less disruptive to the surrounding environment.

Additionally, SIP panels are lightweight but structurally strong, providing a durable and long-lasting building solution. They are also highly resistant to moisture, mold, and pests, making them a low-maintenance option for a granny annex.

Overall, SIP panels offer an excellent solution for creating granny annexes, providing a highly insulated, energy-efficient, and customizable living space that can be built quickly and with minimal disruption.

Hampstead granny annexe

  The government is happy with this trend. That is why, around the country, they are cutting paperwork to make it easier for homeowners to install granny-flats, thereby increasing housing and promoting family living arrangements.     When it has never been easier to get building approval for new structures on existing residential properties, it is no surprise that personal investors choose to capitalise on their own home than buy another. And when you can spend more time with your family and have independence at the same time, granny flats make the perfect compromise for the young and old alike. Adding value to your home and family means that granny flats are becoming very popular indeed. There are many reasons to consider the construction of a granny flat or other separate residence on your property. The name itself comes from the idea of offering a retreat for the elderly so that they may pass on the family home to their children but still maintain a close contact with them. In the same vein, they make a wonderful stepping stone as children reach adulthood but wish to take advantage of living rent free while they engage in tertiary studies or save for their own home. Granny flats can also make wonderful guest houses and creative studios.


You will have a project manager to speak to at every stage of the design and build.

A granny annexe is a self-contained living space that is typically built on the grounds of a family home and used to provide independent living for an elderly relative. The term "granny annexe" is derived from the fact that these living spaces are often used by grandparents or other elderly family members who want to maintain their independence while still being close to their loved ones.

Granny annexes are typically small, self-contained units that include a bedroom, bathroom, living room, and kitchenette. They may also include features like ramps, grab bars, and other accessibility features to make them more suitable for elderly residents.

In many cases, granny annexes are built as an extension to an existing home or in a separate building on the same property. They are often designed to blend in with the surrounding architecture and landscaping, and may be subject to local building codes and regulations. Building your granny annexe is a process that takes place with minimum disruption to your daily routine. We hope the following will give you peace of mind.  In as little as 4-6 weeks, your annexe will be built, decorated and finished, with all the finishes touches applied and is ready to move in. We take care of all the painting and decorating, any last minute tweaks and everything is thoroughly cleaned before we hand over the keys to you. We promise to start and finish on the agreed date and make any necessary final adjustments, and every granny annexe is inspected   by Government approved building inspectors throughout the build. We can make these satisfaction guarantees because we’re the most experienced builder of granny annexe homes in the country.

Included in the price

• Individually designed to your exact specifications

• Spacious open plan living and dining area

• Separate bedroom with en-suite shower room

• Modern kitchenette including sink and taps, built-in stainless steel electric single oven, hob with extractor fan

• Fully building control compliant

• Plastered walls and ceiling

• Latest Structural Insulated Panel System (SIPS) – providing extremely good insulation

• Pitched roof with slate roof tiles of flat roof

• Low maintenance PVCu French doors and casement windows in colour that you chose

• All integral electrics and lighting

• Spacious vaulted ceiling (for pitched roof systems )

We’ll visit you to discuss all the options and prices, then send you floor plans, 3D models and fully inclusive prices. Our designer will recommend the best space in your garden for your new granny annexe. They will perform a technical survey to accurately measure the plot and check the soil conditions, drainage systems and the specifications for the foundations of your new home. You will have ample opportunity to view some of the granny annexe homes we have recently built for our customers. 

  We will then design your Granny Annexe incorporating all your needs for the shape and size of your living room, dining area, kitchen and bathroom. We will then brief our technical designers to create the finished drawings, floorplans and 3D models. Your project manager will calculate the price for all the options and we will send you a fully inclusive price quotation. Please contact us to book your free site survey so we can start designing your brand new Granny Annexe.

From concept to completion, each Granny Annexe is designed to your exact specification

What are garden rooms or granny annexe?

Garden rooms and granny annexes are both types of self-contained living spaces that are typically built in the garden or backyard of a main house. They are designed to provide extra living space for a variety of purposes, including accommodating guests, providing space for hobbies or home offices, or serving as a separate living space for family members or renters.

A garden room is a standalone structure that is usually designed as an extension of the main house, although it is physically separate from it. Garden rooms are typically used as additional living space, and can be used as a home office, gym, or even as a self-contained guest suite.

A granny annexe is a type of garden room that is specifically designed to provide a separate living space for an elderly family member or as a rental income property. Granny annexes are typically designed to be self-contained, with their own kitchen, bathroom, and living space.

Both garden rooms and granny annexes can be customized to meet the specific needs and preferences of the homeowner. They are often constructed using sustainable materials and eco-friendly design principles, and can be a cost-effective way to increase the living space of a home without the need for a full-scale renovation or extension. 

If you’re looking to add extra space to your garden, then a Garden Office could be the perfect solution. Trj construction Garden Offices are available in various designs and sizes, so you can find exactly what you need for your garden.

Types of garden buildings 

SIP panels (Structural Insulated Panels) are an increasingly popular building material for creating garden buildings due to their high levels of insulation, energy efficiency, and strength. Here are some of the types of garden buildings that can be created using SIP panels:

  1. Garden offices: SIP panels are perfect for creating garden offices as they provide excellent insulation, making them warm in winter and cool in summer. SIP panels are also quick and easy to install, making them ideal for creating a functional workspace in your garden.
  2. Garden studios: SIP panels can be used to create garden studios, providing a peaceful and inspiring environment for artistic or creative pursuits. These garden buildings can be designed with plenty of natural light, ensuring a bright and airy space.
  3. Garden gyms: SIP panels are perfect for creating garden gyms as they provide a strong and durable structure that can withstand the weight of fitness equipment. SIP panels also provide excellent insulation, ensuring a comfortable and energy-efficient space to work out in.
  4. Garden annexes: SIP panels are ideal for creating garden annexes as they provide a fully insulated and self-contained living space that can be used as an extra bedroom, home office, or as a rental income property.
  5. Garden cabins: SIP panels can be used to create garden cabins, providing a comfortable and cosy space for relaxing or entertaining. SIP panels are strong and durable, ensuring that garden cabins can be used year-round.
  6. Garden storage sheds: SIP panels can be used to create garden storage sheds that provide excellent insulation and are strong enough to withstand heavy loads. These garden buildings can be designed to meet your specific storage needs, ensuring that your outdoor equipment and tools are kept safe and secure.

Overall, SIP panels offer a versatile and practical solution for creating a wide range of garden buildings that are both energy-efficient and cost-effective.

What are the benefits of garden rooms?

Garden rooms are a great way to expand your home without expanding your footprint. They’re like a mini-greenhouse that you can take with you wherever you go, and they’re an excellent way to spend time with family, friends, and even pets. 

They are also great for people who enjoy gardening but don’t have the space or expertise to grow plants in their backyard. Finally, they are perfect for those who want to be able to enjoy the outdoors without having to go outside. 

Who is constructing the best garden rooms in the UK?

Trj construction provides you with all the services in place. And it is the best place for garden room services. They provide all kinds of services. They will provide you with bespoke garden rooms, Garden offices, Man caves, and many other things.

They can build your dream house on your own budget with our professional team. They are also providing products like school buildings, commercial buildings, exhibitions, and play areas. So you can add dimensions to your garden. Their bespoke buildings are a great way to add more space to your garden or to create a brand-new function. You could even have a playhouse or studio in the garden too.

Final Words 

All these garden room services are available with trj construction at affordable prices. Read the post mentioned above to know more about garden rooms.

Granny annex and Granny Flats are quickly becoming a simple investment option that increases the value of your home, provides more flexible living arrangements and can produce regularly passive income from your family home. More people are working from home than ever before, and more young renters looking for small places near high-growth business areas. It is little wonder, then, that so many people are buying and constructing granny flats all over UK .

The Garden Room is a great option if you want to add extra space to your house. It's easy to install and doesn't require any planning permissions. You can choose between a lodge, a cottage or even a granny annexe. All of these options will give you extra space and make your home look better than ever before.


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