Garden Annexe Cost Garden Room Pricing Blog

Our Garden Room Installation Service

Expert Installation. All Included. No Hidden Extras.

At The Green Room, we offer a full installation service for our garden rooms, lodges and granny annexes. Every project is managed from start to finish by our in-house team. We don’t pass you from one contractor to another. We keep things simple, professional and straightforward.

What we quote is what you pay. There are no surprise charges and no missing parts. Just a complete, carefully planned build with everything you need.

Fully Managed. From Delivery to Final Fit.

Once your building is designed and confirmed, we handle it all. Delivery, foundations, build, electrics, heating, flooring, plastering and final clean down.

We also provide all required electrical certification, and manage Building Control inspections if needed.

We’ve installed hundreds of garden rooms and granny annexes in Northamptonshire and across the UK. Whether you’re building a home for a loved one or creating extra space in the garden, you’ll always deal with a team that takes pride in their work.

Grey composite-clad annexe corner with outdoor seating on decking

What Does Our Installation Service Include?

We handle every part of the installation process

Whether you’re building a home office, a garden lodge or a fully fitted granny annexe, our team takes care of everything on site from surveying and planning right through to internal fittings and finishes.

Experienced Installation Team

Your building will be installed by our own fully qualified team. With years of hands-on experience, they’ve completed hundreds of garden rooms, lodges and granny annexes across the UK. Their skill and attention to detail ensure your project runs smoothly from day one.

Free Site Survey

We’ll visit your garden to check the layout, measure access, and assess how we’ll connect to mains electricity, water and drainage. If your build includes a kitchen or bathroom, we’ll plan out the pipework and fall levels. If needed, we can fit a pump station too.

Laying of Foundations

We choose either engineered screw piles or reinforced concrete pads to suit your site’s ground conditions and the structural requirements of your project. Both options create a strong, stable foundation, and we provide structural calculations where required.

Electrical Connection Setup

Our electricians connect your building to your home’s consumer unit using armoured cable. If access is tricky or a trench is needed with no boundary wall or fence, an extra charge may apply. We’ll always explain this in advance.

Heating and Lighting Installation

Our rooms come fitted with Ecostrad iQ ceramic radiators. These are modern, energy-efficient and fully programmable. We also install warm LED downlights inside and stylish up/down PIR lights outside.

Laying of Water Resistant Flooring

We use Quick-Step Impressive Ultra laminate throughout. It’s durable, easy to clean and designed for wet areas. This is one of the most water resistant laminate floors available today.

Free Delivery

Your building is delivered in the style, finish and colour you’ve chosen. Delivery is always included in the price, with no extra charge or added fees.

Professional Interior Finish

All internal walls and ceilings are plaster skimmed for a smooth, modern finish. There are no plastic joiners or silicone seams. The result feels more like a home than an outbuilding.

Backed by Experience and a 10-Year Guarantee

Your building is protected by a 10-year structural guarantee as standard. Materials are carefully chosen for strength, stability and long-term use.

We also offer:

  • Full structural calculations
  • Part P electrical sign-off
  • Optional 10-year insurance-backed warranty (IWA)

Need peace of mind? Just check our customer reviews. Families across the country trust us to deliver safe, warm and high-quality buildings with no corners cut.

Annexe decking with stainless steel balustrade and wicker seating

Installation FAQs

Do you take care of all the groundwork?

Yes. We take care of the groundworks and foundations required for your garden annexe, including trenching and either screw pile or reinforced concrete foundations, depending on the site requirements.

We also manage the agreed water, drainage and electrical connections as part of the project, so you don’t need to arrange separate trades for this work.

Do I need to prepare the garden before you start?

We’ll assess your garden during the free site survey and let you know if anything needs to be prepared before installation begins.

The area where the annexe will be installed will need to be clear and accessible. If sheds, trees, fencing or other obstacles need to be removed, we’ll identify this during the survey so you can arrange the necessary work before your installation date.

We’ll take care of the groundworks and foundations required for your annexe as part of the agreed project.

Are service connections included in the installation?

Yes. We include the agreed utility connections for your garden annexe, including electricity, water and foul drainage connections to the main property.

During your site survey, we assess the location of the existing services and the distance from the house. If your project requires a longer trench run, pump station or additional work, we’ll identify this and include the agreed costs in your fixed-price quotation.

Can you work around tricky access?

Yes. We’ve installed garden annexes on sites with tight or restricted access. During your free site survey, we’ll assess access to the garden and identify any potential issues before the project begins.

Because we build our annexes on site using SIPs panels, materials can often be carried through narrow access points or, where necessary, through the house.

If any additional arrangements are required, we’ll discuss these with you following the survey.

Do you manage all trades during the build?

Yes. We provide a fully managed service and coordinate the different trades required throughout your garden annexe build, including groundworkers, builders, electricians, plumbers and plasterers.

This means you don’t need to organise or manage separate trades yourself. We coordinate the work and keep your project moving from one stage to the next.

Will I need to arrange building control inspections?

No. Where Building Control inspections and approval are required for your project, we arrange and manage them on your behalf.

We’ll deal with the relevant inspections during the build and provide you with the applicable documentation and certificates when your project is complete.

How disruptive is the installation process?

We aim to keep disruption to a minimum throughout your garden annexe installation. Most annexes are completed on site within around 4–6 weeks, depending on their size and layout.

Our team manages site access, deliveries and waste removal throughout the build. We also keep the site as tidy and organised as possible and keep you informed as the work progresses.

Is the annexe or garden lodge usable straight away after installation?

Yes. Once we’ve completed the installation and final checks, your annexe or garden lodge is fully fitted and ready to use.

The internal walls and ceilings are professionally plastered, but the new plaster will need time to dry fully before painting or decorating. We’ll explain what you need to do at handover.

Who will be working on my site?

Your garden annexe will be installed by our own experienced team, giving you consistency throughout the build and a clear point of contact from start to finish.

You’ll know who is working on your project, and our team will keep you updated throughout the installation.

Get in Touch with The Green Room

Our team of down-to-earth experts genuinely care about great garden spaces and excellent customer service. Whether you’re just starting to explore your options or ready to move forward with your project, we’re here to help.