If you’re thinking about adding a granny annexe to your property in Ireland, you’re not alone. Demand has grown steadily as families look for practical, affordable ways to keep elderly parents close, without the cost or disruption of a full home extension.
This guide covers everything: what a timber granny annexe actually costs in Ireland, what planning permission you need, what’s changing in Irish law in 2026, and which models will work best for your situation.
What Is a Granny Annexe?
A granny annexe is a self-contained living space, typically in the garden or beside the main house, that allows a family member to live independently while remaining close to the rest of the household.
Unlike a standard extension, a granny annexe:
- Has its own entrance
- Is self-contained with a kitchen or kitchenette, bathroom, and sleeping area
- Allows full independent living without sharing the main house
- Can be added without major structural work to the existing property
Timber granny annexes are one of the most popular options in Ireland because they are faster to install, more affordable than block-built extensions, and visually attractive in any garden setting.
How Much Does a Granny Annexe Cost in Ireland in 2026?
| Type | Floor Area | Structure Cost | Best For |
|---|---|---|---|
| Compact 1-bed annexe | 27–36 m² | From €8,200 | One person, independent living |
| Standard 1-bed with terrace | 27–36 m² | From €9,900 | Outdoor living, extra comfort |
| Two-storey timber annexe | 35–36 m² | From €12,000 | Maximum space, small footprint |
| Two-storey, modern cladding | 35 m² | From €18,000 | Contemporary finish, modern homes |
All TimberLodge365 annexe prices include VAT and free delivery across Ireland. The structure price covers the full timber kit, walls, roof, floor, double-glazed windows and doors, and hardware.
Additional costs to budget for:
- Foundation / concrete base: €1,500–€4,000 depending on ground conditions
- Internal fit-out (electrics, plumbing, heating): €5,000–€15,000 depending on specification
- Planning permission (if required): €1,500–€5,000 including architect drawings
- Assembly service: available as an optional add-on, ask us for a quote
Total realistic budget for a fully fitted timber granny annexe in Ireland: €15,000–€40,000 depending on size and specification. This compares very favourably to a traditional block-built extension, which typically starts at €40,000–€60,000 for equivalent space.
Timber Granny Annexe vs Block-Built Extension: Which Is Better?
| Timber Granny Annexe | Block-Built Extension | |
|---|---|---|
| Cost | From €15,000 fully fitted | From €40,000+ |
| Build time | 2–8 weeks | 3–6 months |
| Planning required | Often exempt under 25m² | Almost always required |
| On-site disruption | Minimal | Significant |
Do You Need Planning Permission for a Granny Annexe in Ireland?
Under current Irish planning law, detached structures in the garden can qualify as exempt development if they meet certain criteria, but structures intended for residential living usually still require full planning permission.
Read our full Planning Permission Guide for Log Cabins & Annexes in Ireland 2026.
Our Granny Annexe Models
- IR-011 – 36m² 1-Bedroom Annexe with Veranda, from €8,200. Comfortable, compact, and ideal for one person living independently.
- IR-019 – 27m² Cosy Cabin with 8m² Terrace, from €9,900. Compact interior with a generous terrace.
- IR-004 – 36m² Two-Storey Timber Annexe, from €12,000. Our most popular granny annexe. Maximises usable space without requiring a large garden area.
- IR-004CL – 35m² Two-Storey with Modern Cladding, from €18,000. Designed for homeowners who want an annexe that complements a modern house style.
Browse the full Granny Annexes range.
What’s Included in the Price?
✅ Full timber building kit (walls, floor, roof)
✅ Double-glazed wooden windows and doors
✅ Hardware kit
✅ Free delivery across Ireland
✅ VAT included
✅ 10-year anti-rot warranty
Frequently Asked Questions
Do I need planning permission for a granny annexe in Ireland?
In most cases, yes, if the annexe will be used as permanent residential accommodation. Smaller structures under 25m² have a stronger case for exempt development. Read our full planning guide.
How much does a granny annexe cost in Ireland?
Our timber annexe structures start from €8,200 including VAT. A fully fitted annexe typically costs €15,000–€40,000 depending on specification.
What is the smallest granny annexe available?
Our most compact model suitable for full-time living is the IR-019 at 27m², starting from €9,900.
Ready to Add a Granny Annexe?
Or contact our team, we’ll help you choose the right model and give you a no-obligation quote.
All annexes include free delivery across Ireland and a 10-year anti-rot warranty.
Want to see how our annexes compare in price? Read our Log Cabin Prices Ireland 2026 guide.