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Planning permissions running out in Dún Laoghaire-Rathdown expiring and lapsed grants, s.40

Housing permissions that expire within a year with no sign of a start, and ones that lapsed recently unbuilt. Soonest first.

12 sites with a housing permission running out or recently lapsed, and no start

None new this week · tracked since 24 Sept 2026

  • 18 ha in all
  • 1,727 homes
  • checked 25 Sept 2026

Running out soonest

  1. Frankfort CastlePermission running out

    Frankfort Castle, Old Frankfort, Dundrum, Dublin 14. (www.frankfortcastleshd.com) · Dundrum · 0.90 ha · 115 homes · runs out 20 Dec 2026 · source

    115 homes granted 20 Dec 2021, expires 20 Dec 2026

  2. Lands adjoining Clonkeen CollegePermission running out

    Lands adjoining Clonkeen College, Clonkeen Road, Blackrock, Co. Dublin. (www.clonkeenshd.com) · Dún Laoghaire · 3.36 ha · 299 homes · runs out 23 Dec 2026 · source

    299 homes granted 23 Dec 2021, expires 23 Dec 2026

  3. RocklawnPermission running out

    Rocklawn, Leopardstown Road, Dublin 18. (www.rocklawnshd.ie) · Glencullen-Sandyford · 0.84 ha · 112 homes · runs out 10 Feb 2027 · source

    112 homes granted 10 Feb 2022, expires 10 Feb 2027

  4. Barn Elms EstatePermission running out

    Barn Elms Estate, 68 Churchtown Road Upper, Churchtown, Dublin 14 · Dundrum · 0.77 ha · 10 homes · runs out 16 Mar 2027 · source

    10 homes granted 16 Mar 2022, expires 16 Mar 2027

  5. Brewery Road and Leopardstown RoadPermission running out

    Lands at 'St. Joseph's House' and adjoining properties at Brewery Road and Leopardstown Road, Dublin 18. (www.sjhshd.ie) · Stillorgan · 2.71 ha · 463 homes · runs out 13 Apr 2027 · source

    463 homes granted 13 Apr 2022, expires 13 Apr 2027

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7 more of 12

  1. 'Fairholme', & 'St. Benedict's'Brighton RdPermission running out

    1.27 Ha site rear of 'Craughwell', 'Fairholme', & 'St. Benedict's'Brighton Rd, Foxrock, D18, access/egress & works to 'Craughwell' Brighton Rd, Foxrock D18, Harcourt Street tramline & Leopardstown Racecourse to south Brighton Wood, north by 'Goleen' · Glencullen-Sandyford · 1.29 ha · 37 homes · runs out 19 May 2027 · source

  2. 'The Grange'Permission running out

    Lands adjacent to 'The Grange', Brewery Road and Stillorgan Road, Stillorgan, Blackrock, Co. Dublin. (www.grangephase1shd.ie) · Stillorgan · 1.84 ha · 102 homes · runs out 2 Jun 2027 · source

  3. Fey YerraPermission running out

    Fey Yerra, Leopardstown Road, Dublin 18 · Stillorgan · 0.50 ha · 12 homes · runs out 16 Sept 2027 · source

  4. Mount Saint Mary's and Saint Joseph'sPermission expired

    Mount Saint Mary's and Saint Joseph's, Dundrum Road, Dundrum, Dublin 14. (www.msmshd.ie) · Stillorgan · 1.60 ha · 231 homes · lapsed 25 Aug 2026 · source

  5. Dalguise House . Monkstown RoadPermission expired

    Dalguise House (a protected structure). Monkstown Road, Monkstown, Blackrock, Co. Dublin. (www.dalguiseshd.com) · Dún Laoghaire · 3.66 ha · 298 homes · lapsed 25 Aug 2025 · source

  6. KillartPermission expired

    Killart, Clonkeen Road, off the Old Bray Road & bounded by the N11 to the North, Cornelscourt, Dublin 18 · Stillorgan · 0.42 ha · 19 homes · lapsed 26 May 2025 · source

  7. 62 & 63 (Innisfree), Stepaside LanePermission expired

    0.4939ha site at nos. 60 (Cois Cnoc), 61, 62 & 63 (Innisfree), Stepaside Lane, Stepaside, Dublin 18 · Glencullen-Sandyford · 0.50 ha · 29 homes · lapsed 10 Oct 2024 · source

Where they are

Source: Planning applications (Department of Housing national planning data), checked 25 Sept 2026. Each row links to the record it came from.

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What this means for a buyer

A planning permission lasts five years from the grant unless it says otherwise (section 40 of the Planning and Development Act 2000). It can be extended under section 42, but only if substantial works were done before it expires, which rules out a site where nothing has started. An owner facing expiry must build, apply again or sell. The old permission is then a precedent for the next application.

How long planning permission lasts, and extending it (Planning Register)

Questions people ask

How long does planning permission last?

Five years from the date of the grant (s.40 of the Planning and Development Act 2000), unless the permission sets a longer period.

Can an expiring permission be extended?

Yes, under s.42, by up to five years in total, if you apply before expiry and substantial works have been done. A 2025 route for unstarted permissions closed to new applications in February 2026.

What happens when a permission lapses?

Any part not built becomes unauthorised. The owner needs a new permission; the lapsed grant is still a useful precedent for it.

What counts as "running out" on this list of sites in Dún Laoghaire-Rathdown?

A permission for homes that expires within twelve months with no commencement notice lodged, or one that lapsed recently without a start.

Are these sites for sale?

Not necessarily. None is advertised here. These owners have a deadline, which is when many decide to sell.