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Bespoke Living AnnexesAward-Winning Designs15 Year WarrantyOver 18 years’ experience5 Star ReviewsFully Bespoke or Straight to SiteFriendly, Flexible and Capable ServiceComplete turnkey service — Design, Planning, BuildingYour Life, Your Choice, Your HomeSafe, Secure and Trusted
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Annexe project · Timeless Garden Rooms

12m x 5m two-bedroom granny annexe

Sixty square metres with a pod on the back for the shower room, a ramp to the veranda and doors already wide enough for a wheelchair that is not needed yet.


Published 22 November 2019 · Updated 30 September 2026 · 3 minute read · Written by The Garden Room & Annexe Guide

12m x 5m two bedroom granny annexe by Timeless Garden Rooms
Timeless Garden Rooms  12m x 5m, two bedrooms

In addition to designing some of the most traditional garden rooms on the market, Timeless Garden Rooms also specialises in self-contained garden annexes.

This spacious granny annexe is a great example. The clients wanted to create a home for an elderly relative who still valued her independence but needed to be close to family.

With no available space in the main house for self-contained accommodation, the family turned to their garden.

At a glance

  • Size: 12m x 5m, with an extra ‘pod’ at the rear holding the shower room so none of the footprint is wasted.
  • Layout: partition walls make four rooms — an open-plan living area, two bedrooms and a shower room.
  • The second bedroom: unusual in an annexe this size; it lets the relative have guests, and doubles as a study or hobby room.
  • Inside: a vaulted ceiling over the main room, a well-equipped kitchen in one corner, and underfloor heating so no wall is taken up by radiators.
  • Futureproofed: wider doors for a wheelchair that is not needed yet, and a ramp up to the covered veranda along the front.
  • Planning: full Planning and Building Control approval; the Local Authority was supportive given it was for an elderly relative.

Part of our two-bedroom annexe guide →

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A self-contained annexe
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No planning permission
required in most cases
Kitchen, bathroom & bedroom
— a home from day one
Fully fitted & insulated,
built in weeks
Based in Brighton & Hove,
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The design

A collaborative design process

Timeless Garden Rooms takes a collaborative approach to design. For this project, the team held several meetings with the mother and daughter to refine the brief and explore design options. Three different plans were drawn up for the family to consider.

The final choice was a 12m x 5m building with an additional ‘pod’ at the rear, designed to house the shower room. This clever use of space ensured that no part of the building footprint was wasted, a benefit of working with a bespoke designer.

The shape of the annexe was designed to maximise the plot
The pod  the shower room, added at the rear
Planning

Planning & Building Control approval

A self-contained living annexe like this requires both Planning and Building Control approval before construction can begin. While this process can seem daunting, Timeless Garden Rooms handled the applications on behalf of their clients.

The structure was designed to meet the building regulations
Built to the regulations

The Local Authority was particularly supportive, as the annexe was intended for an elderly family member, making the planning process straightforward.

In addition to Planning approval, the project needed to be signed off by Building Control. This ensures that the building is structurally sound, energy-efficient, and compliant with fire safety regulations.

Layout

The building was divided to create four rooms

Partition walls were used to divide the building into four rooms: an open-plan living area, two bedrooms, and a shower room.

The annexe was divided into four rooms
Four rooms

It’s a nice feature that this annexe includes a second bedroom, as many similar projects often have just one bedroom or are studio apartments. The second bedroom allows the relative to host guests and doubles as a sewing room. Downsizing doesn’t mean giving up hobbies!

The main living area is spacious and features a vaulted ceiling, creating a bright and airy atmosphere. A well-equipped kitchen has been installed in one corner of the room.

A modern well equipped kitchen has been fitted in the main room
The kitchen  in one corner of the main room

Underfloor heating has been fitted throughout the annexe, allowing the walls to remain free of radiators and offering more flexibility for furniture placement.

The shower room at the rear of the building is generous in size. As part of their comprehensive service, Timeless Garden Rooms managed the connections to the mains supply for both the kitchen and the shower room.

The annexe features a spacious shower room
The shower room
Futureproofing

Futureproofing the design

Consideration has been given to how the annexe might be used in the future. While wheelchair accessibility isn’t needed now, wider doors have been installed to allow for easy access down the line. Planning for such details can significantly extend the building’s long-term functionality.

A ramp has been fitted for easy access into the annexe
The ramp  up to the covered veranda

A ramp has also been built leading up to the annexe, making it easily accessible both now and in the future. The ramp leads to a covered veranda that runs along the front of the annexe, with French doors opening onto it-creating the perfect spot to relax on a summer day.

Planning something similar?

Learn more about Timeless Garden Rooms

To learn more about creating a garden annexe, visit Timeless Garden Rooms’ specialist website. You can also contact the team on 01843 821 851 or email them at sales.timelessgardenrooms@gmail.com.

Visit Timeless Garden Rooms More Timeless Garden Rooms projects
More projects like this Granny annexes Two-bedroom annexes Annexes 55 sqm and above
Read the guides Garden annexes: the complete guide What an annexe costs The Caravan Act route Granny pods

Published 22 November 2019 · Photographs courtesy of Timeless Garden Rooms.

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A self-contained annexe
in your garden
No planning permission
required in most cases
Kitchen, bathroom & bedroom
— a home from day one
Fully fitted & insulated,
built in weeks
Based in Brighton & Hove,
building across England
Explore annexes →
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A self-contained annexe
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Kitchen, bathroom & bedroom
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Fully fitted & insulated,
built in weeks
Based in Brighton & Hove,
building across England
Explore annexes →
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