NL-40B · 1 bed · Exempt*
The Slaney — 40 m² 1 bed granny flat floor plan
The slimmest full one-bed in the range, for long narrow gardens where a 5 m-wide unit will not fit. A king-size bedroom sits at the quiet end behind the bathroom and a storage hall.
Compare this layout with our granny flat floor plans in Ireland or explore the granny flat sizes and prices.
The PDF is an A4 landscape sheet drawn at 1:50. Print it at 100 % (no “fit to page”) and 1 mm on paper is 50 mm in your garden; the 2 m scale bar measures 40 mm. Drawing NL-40B-P01, revision A.
Key facts
- External size
- 9.5 × 4.2 m
- Gross external area
- 39.9 m²
- Internal area
- 30.8 m²
- Planning
- Exempt*
- Walls & doors
- 350 mm ICF · 1000 mm entrance · 900 mm internal
- Closest standard size
- Between our 33 m² and 45 m² sizes — priced for your site
Why this layout works
- Only 4.2 m wide externally
- King-size bedroom with full-width wardrobe
- Glazed gable with patio doors
- Utility run in the hall keeps the kitchen clear
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Room schedule
| Room | Internal area | Internal size |
|---|---|---|
| Living / kitchen | 14.0 m² | 4.0 × 3.5 m |
| Bath | 3.1 m² | 1.7 × 1.8 m |
| Hall | 2.9 m² | 1.8 × 1.6 m |
| BedroomCompact double — below the 11.4 m² / 2.8 m apartment guideline | 10.2 m² | 2.9 × 3.5 m |
| Total internal | 30.8 m² | includes partitions |
Checked against
Every plan is checked automatically against the rules below before it is published. “Note” means the plan meets the rule with a qualification worth knowing.
- pass
Class 3A size band 32–45 m² (S.I. No. 340/2026)
39.9 m² gross external (30.8 m² internal). The band is measured on the external footprint.
- note
Bedroom sizes (Design Standards for New Apartments, Appendix 1)
Bedroom: 10.2 m² — Compact double — below the 11.4 m² / 2.8 m apartment guideline. Guideline: single ≥ 7.1 m² / 2.1 m wide (met by every bedroom); double ≥ 11.4 m² / 2.8 m.
- pass
Escape window in every bedroom (TGD B, Vol. 2)
Each bedroom has a window on an external wall, to be sized ≥ 0.33 m² clear, ≥ 450 mm each way, cill 0.8–1.1 m.
- pass
Entrance door ≥ 800 mm clear opening (TGD M 2010, Section 3)
1 entrance door drawn with a 1000 mm structural opening (926 mm leaf); internal doors 900 mm openings (838 mm leaves).
- pass
Sanitary activity spaces (BS 6465-2)
WC 800 × 600 mm, basin 700 mm and shower 700 mm access spaces are clear of other fixtures and walls in every bathroom.
- pass
Bed access
≥ 600 mm clear along at least one long side of every bed.
- pass
Kitchen working clearance
≥ 1000 mm clear in front of every run (NKBA recommends 1070 mm for one cook; CEUD 1500 mm between opposing surfaces for wheelchair use).
- note
Floor-to-ceiling height
2.4 m minimum (TGD F guidance); Class 3A limits overall height to 3.0 m (4.0 m with a tiled or slated pitched roof).
At 39.9 m² gross external this plan sits inside the 32–45 m² Class 3A band under S.I. No. 340/2026, subject to all conditions and site eligibility. The band is measured on the external footprint, so the external size on the sheet is the figure that counts.
Concept plan for review, not for construction. Furniture is indicative. *Exempt-class size under S.I. No. 340/2026, subject to site eligibility. *Subject to site eligibility under S.I. No. 340/2026, Class 3A (32–45 m² in the rear garden, owner living in the main house, at least 25 m² of garden remaining, own access within the garden, 14-day notice to the council) — confirmed at your free site visit. Build time refers to the on-site structural build once foundations are ready; excludes design, planning and connections lead-time. Prices exclude site works, connections and professional fees. †Garden Studio: Class 3, Part 1, Schedule 2, Planning and Development Regulations 2001, as substituted by S.I. No. 338/2026. Not forward of the front wall; finishes to match the house if built to the side; not for human habitation. May not apply where planning conditions restrict exempt development. Counts towards the 45 m² Class 3A limit if you later add a garden home. Confirmed at your free site visit.