Garden Annexe Cost Garden Room Pricing Blog

Designed for Independent Living

A safe, warm home at the heart of the garden

This one-bedroom garden annexe in Desborough, Northamptonshire, was built for Lynne’s mother, offering a private space with everything needed to live comfortably. As families look for better solutions to support ageing parents, this kind of setup provides the right balance of independence and togetherness.

Built to Suit the Garden and Lifestyle

This annexe was planned and built in line with full building regulations.

Planning permission was needed due to its use as a permanent home.

  • Location: Desborough, Northamptonshire
  • Planning Authority: Kettering Borough Council
  • Full planning permission secured
  • Utilities connected to mains services
  • Finished in grey-brown fibre cement cladding with oak features

Project Specs:

  • One-bedroom annex
  • Custom hideaway kitchen
  • Bathroom with shower
  • Fully insulated SIPs build
  • Planning & building control included
Granny Annexe Desborough Northamptonshire rooms

What Was Included

All the Comforts of Home

This garden annexe came fully fitted with high quality finishes, bespoke fixtures, and everything needed to move in right away.

Handmade Hideaway Kitchen

Handmade Hideaway Kitchen

A custom-built gloss white kitchen designed to maximise space, with a foldaway layout that keeps everything neat and tidy.

Built-in Appliances

Built-in Appliances

Fitted with a two-ring induction hob, combination microwave-grill, fridge with freezer compartment, and stainless steel sink and drainer.

Fully Fitted Shower Room

Fully Fitted Shower Room

The shower room includes a walk-in cubicle with thermostatic controls, a modern vanity unit and toilet, all fitted to high standards.

Screw Pile Foundations

Screw Pile Foundations

Approved by building control, these foundations give long-term strength and avoid the disruption of traditional trench digging.

Mains Utilities Connection

Mains Utilities Connection

The annexe is connected directly to mains electrics, water and foul drainage. All trenching, pumping and reinstatement were handled by our team.

First & Second Fix Plumbing and Electrics

First & Second Fix Plumbing and Electrics

Professionally installed and certified. This included sockets, switches, lighting and plumbing for kitchen and bathroom appliances.

Thermal Performance

Thermal Performance

Built using structurally insulated panels (SIPs), this annexe is warm, quiet and energy efficient all year round.

LED Lighting

LED Lighting

Energy-saving LED downlights fitted throughout, along with external lights to key entry points for added convenience and security.

Premium Windows & Doors

Premium Windows & Doors

Double-glazed oak-effect windows and doors give the annexe a warm finish and complement the grey-brown fibre cement cladding perfectly.

Bedroom with Fitted Wardrobe

Bedroom with Fitted Wardrobe

The bedroom includes a full-height built-in wardrobe with sliding doors, offering plenty of practical storage without taking up extra space.

Open Plan Living Area

Open Plan Living Area

The light-filled living space is open plan, creating a relaxed layout that connects easily to the kitchen and gives the annexe a spacious feel.

Garnny Annexe Build

Project Timeline

A structured build from start to finish, managed by our expert team

1

Planning Permission

Planning Permission

We secured full planning permission with Kettering Borough Council, including all necessary documentation for a permanent dwelling.

2

Groundworks & Utilities

Groundworks & Utilities

Our team carried out groundwork and trenching for water, foul drainage, and mains electrics. This stage took about a week to complete.

3

Foundations & Base Installation

Foundations & Base Installation

We installed screw pile and concrete pad foundations based on full structural calculations. This was followed by the floor and SIPs wall assembly.

4

Annexe Construction

Annexe Construction

The structure went up quickly over four days. Once watertight, we began internal works including walls, plasterboarding, and internal doors.

5

Plumbing, Electrics & Interiors

Plumbing, Electrics & Interiors

First fix installations were followed by the kitchen and bathroom fit-out, with second fix electrics, flooring, skirting and finishings completed in week two.

6

Testing & Handover

Testing & Handover

Final inspections were carried out by building control and our electrician. A Part P electrical certificate was issued and the annexe was ready to decorate.

Take the Tour

A walkthrough this completed garden annexe.

Granny Annexe - Installed in Desborough, Northamptonshire

A Personal Touch with Room to Grow

Designed for now, ready for the future

The Desborough annexe includes everything needed for independent day-to-day living. Inside, the layout is simple and open, with clear divisions between the kitchen, living area, bedroom and shower room. All fittings and finishes were chosen by the client, including the grey-brown cladding, oak trims, and gloss white kitchen.

A raised patio is planned for spring, which will create an easy connection between the annexe and the garden. The outdoor space has been left clear and level, ready for this next stage.

The building meets full building control approval, including water and mains connections. Planning permission was required and successfully managed through Kettering Borough Council. The process was handled by The Green Room from start to finish.

Interested in something similar? Get a free quote or explore more options on our Granny Annexes page.

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.