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Garden Room Installation | How Long Does It Take to Build?

1st December 2025

How Long Does a Garden Room Installation Take?

A Green Retreats garden room typically takes just 2 to 5 days to install. This applies across our Basebox, G-Range and A-Range designs. Because every component is prefabricated in our UK factory, the on-site build is fast, tidy and low disruption. Our in-house teams arrive with everything ready to assemble, bringing your building together quickly and to a consistently high standard.

Garden Room Install Times

Why Green Retreats Garden Rooms are Installed So Quickly?


Prepared and Ready to Assemble.

Every wall panel, roof section and floor piece is made in our Buckinghamshire factory to the exact measurements of your chosen design. Because everything is prepared beforehand, on-site time is dramatically reduced.

 

Complete time and quality control.

We take care of everything ourselves too, and never outsource, meaning we have complete control over timescales and quality.

  • No waiting for external contractors
  • No delays from off-site suppliers
  • No unpredictable schedules

Your building arrives ready to assemble, allowing our teams to complete the main structure in just a few days while keeping your garden clean and disruption to a minimum.

Top 3 Benefits of a Fast On-Site Garden Room Installation


1 –
Less Disruption to Home Life

2 – Your New Space, Ready Sooner

3 – Predictable Timelines, No Hassle

garden room installation team carrying roof panels of a building.

What to Expect During Your Garden Room Installation

Your garden room installation follows a smooth and structured sequence, and each stage has its own typical timeframe. Here are the key steps you can expect during the build.


Day 1:
Base Installation

Your base is installed in around half a day using our patterned base system. This creates a strong, level foundation that is designed and fitted by our own in-house team.


Day 2:
Structure and Weatherproofing

The main structure is assembled and the insulated wall and roof panels are fitted. Once the doors and windows are installed the building becomes fully sealed from the weather.


Day 3:
Decking and Internal Works

Your decking or entrance platform is built, followed by the internal wiring for lighting, sockets and future appliances.


Day 4:
External Detailing and Interior Progress

The final elements of the structure are completed, including flashing, ceiling preparation or internal boarding depending on your design. The building is now structurally complete.


Day 5:
Final Fix and Finishing Touches

After a short settling period the team returns to complete the final fix. This includes small finishing touches to ensure every detail meets our high standards. Once signed off, your garden room is ready to use.

Watch a full garden room installation in just 6 minutes…

If you would like a closer look at the process, our garden room installation video shows the build happening in real time, from the first panel to the final finish. Watch how a Green Retreats garden room is installed from start to finish!

What Factors Affect Garden Room Installation Time?

Your garden room installation follows a simple week by week plan. The main building is completed in the first week, and any upgrades happen afterwards.

Timelines can vary slightly based on size, extra glazing, partitions or upgrades such as plastering, blinds, air conditioning or extended decking. Our Customer Care team schedules each step so you always know what is happening next. Weather rarely causes delays because the building becomes watertight very early on.

Here is the quick week by week version:

Melamine Finish

Week 1: Base fitted
Week 1 or 2: Main building installed
Week 2: Electrics
Week 3: Blinds if chosen
Week 4 or 5: Air conditioning if chosen

Family talking to a garden room installer

Plastered Finish

Week 1: Base fitted
Week 1 or 2: Main building installed
Week 2 or 3: Plastering and drying time
Week 4: Electrics
Week 5 or 6: Final Fix including flooring and skirting
Week 6 or 7: Blinds if chosen
Week 8: Air conditioning if chosen

garden room installation team fitting plasterboards in a garden room

Visit Our Showroom

We recommend that every customer makes a trip to one of our two showroom locations to see the quality of our garden buildings in person. You can take a look around our extensive range of varying designs in order to get a feel for what best suits you, and also discover the versatility of our garden rooms. Our buildings have endless uses, home gyms, office space, artist studio or even a playroom!


Our Showrooms:

Flagship – Buckinghamshire, Westcott: Featuring 21 garden room buildings in a range of designs, sizes and finishes.

Hub – London, Twickenham: Featuring 4 garden room buildings with a range of sample materials on display as well as our Virtual Reality garden room experience.

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Building Measurements

You can get a great idea of how your new garden office will look by using the 360 degree rotating viewer.

Also compatible with mobile and tablet devices

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Design Your Building

Start designing your garden room today using our online Visualiser tool. You’ll be able to choose your style, size, finishes and get an accurate cost.

Design Your Building

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