Modular Home Annexe Ireland: Garden Annexes for Family Living
Modular home annexes in Ireland — what a garden annexe is, who it's for (granny flat, family annexe, guest annexe), planning, sizes and prices.

Looking for the full picture? Read our guide to granny flats in Ireland.
Modular Home Annexes in Ireland
A modular home annexe is a self-contained modular unit built in the garden of an existing home — for an older relative, a returning adult child, guests or rental. This guide explains what a modular annexe is, who it's for, planning, sizes and prices.
What Is a Modular Home Annexe?
A modular annexe is a factory-built, self-contained living space — typically a studio or 1–2 bed — installed in the garden of a main house. It has its own kitchen, bathroom and living space, and is connected to the main house's services.
Who Is a Modular Annexe For?
- An older relative — a granny flat / family annexe for independent living close to family
- A returning adult child — a young adult who needs their own space
- Guests — a guest annexe for visiting family and friends
- Rental — a garden rental unit (subject to planning and Rent-a-Room rules)
- A home office — a self-contained workspace
Modular Annexe Sizes and Prices
- Studio annexe (15–25m²): from €35,000
- 1-bed annexe (35–55m²): from around €60,000
- 2-bed annexe (36–45m²): from around €80,000
Does a Modular Annexe Need Planning Permission?
A small ancillary garden structure up to 30m² at the rear of your house may be planning-exempt under the general garden-structure exemption. The Class 3A 32–45m² exemption (in force from 27 July 2026) may allow a larger detached auxiliary dwelling without full planning, subject to all applicable conditions. A separately let or self-contained annexe generally needs planning.
See: Planning Permission Ireland and The 45m² Planning Exemption
Modular Annexe vs Extension
| Factor | Modular annexe | Traditional extension | |---|---|---| | Build time | Weeks | 3–6 months | | Disruption | Days on site | Months of dust | | Cost | Fixed-price | Open-ended | | Independence | Self-contained | Part of the house | | Garden placement | Yes | No |
Talk to Us About a Modular Annexe
At New Chapter Homes, we design and install modular annexes for families across Ireland. Book a free consultation to talk through an annexe for your family.
Explore Our Modular Homes
Related Articles
Granny Flats Ireland: Costs, Planning & Rental Income Guide
A practical Irish guide to granny flats and modular granny flats — what they cost, how planning permission works, the realistic rental income potential, energy efficiency and turnkey modular construction from New Chapter Homes.

Outdoor Kitchen Modules & Components: Building Your Garden Kitchen in Ireland
Modular outdoor kitchens let you build the exact layout you want. We break down the core modules and components — from cabinetry and fridges to grills and pizza ovens — and how to configure them for an Irish garden.

How Much Does an Outdoor Kitchen Cost in Ireland? 2026 Pricing Guide
What does an outdoor kitchen cost in Ireland? From a compact BBQ island to a full entertaining suite with pergola, we break down the pricing factors and what to expect in 2026.
Ready to Start?
Talk to Our Team Today
Get expert advice, a free consultation, and a tailored quote for your project.
Get in Touch