What's planned in Dublin 15 — the register within 4 km of Blanchardstown

Within 4 km of the point at 53.393, −6.395, which is Dublin 15 from Castleknock village to Tyrrelstown and from Corduff to Ongar, the register holds 909 planning applications lodged in the 24 months to 14 September 2026, with 572 of the 665 decided granted, an 86% rate. There are 112 appeals to An Coimisiún Pleanála, 385 commencement notices, 18 council consultations, 984 hectares in 1,160 parcels on the residential zoned land tax map, and 1,470 Property Price Register sales in the last year at a median of €428,500. Eight applications are inside their observation window today. Dublin 15 is one of the most populous postal districts in the country and the register reads like it: a built suburb doing its extensions, with three large schemes on its remaining land.

The large schemes

Fingal's register does not state unit counts, so the sizes here are from the files. The Phoenix Park Racecourse lands at Castleknock are the biggest: a large-scale residential development lodged on 23 June 2025 (LRD0051/S3E) and granted, the latest phase of a site that has been coming through the register since the racecourse closed. At Porterstown, the lands front and rear of the Clonsilla Inn hold a granted LRD whose amendments were granted on 1 September 2025 (LRD0076/S3E). North of Tyrrelstown Plaza, two apartment buildings were granted in late 2024 (FW24A/0406E), and on the Clonsilla Road the site of "The Lodge" has an amended apartment scheme lodged on 14 July 2026 (FW26A/0284E) and undecided. Each of these is decided by Fingal under the LRD procedure, with a five-week submission window and an appeal, and the apartments guide sets out how that procedure shaped the schemes before they were lodged.

The infill and the refusals

Most of the 93 refusals are the suburb's ordinary arguments. Castleknock generates the infill cases: four apartments on 0.13 hectares at The Elms, College Road, were granted in 2026 (FW26A/0090E) and then appealed on 25 August 2026, which is the typical Castleknock file, a small scheme on a large garden that the neighbours take to the Commission. Ongar produced a refusal of retention for six apartments made from three office units on Main Street (FW26A/0081E), refused in 2026. Around Sheepmoor, Roselawn and Castlefield the appeals lodged in August 2026 are on single houses: a rear extension, a side garage, a first-floor addition. Of the 112 appeals in the circle, the great majority are of that kind, and the appeals guide explains what the Commission does with them.

Two things push the numbers about. Fingal's register conventions mark a file "Invalid Application" quickly, often within days, where the notices and drawings do not match, and the same address appears twice or three times before a valid file is decided; 16 Orchard Grove, Blanchardstown was invalidated in December 2025 and again in April 2026 on the same extension. And the 70-character description means a keyword search of this register misses what a map search finds, which is why this guide is drawn as a circle.

The council's own works and the consultations

Eighteen consultations sit inside the circle in the window. Two Fingal Safer Schools schemes, at St Mochta's National School on Porterstown Road and at Hansfield Educate Together on Barnwell Road, take submissions to 15 September 2026, and a section 38 consultation on safe routes to school at Scoil Bhríde closed in November 2025. A Part 8 for demolition and council works closed on 5 January 2026, a notice to extinguish a public right of way at Corduff closed on 7 August 2026, and the rest are temporary road closures for events in Castleknock and Clonsilla. None of these is on the planning register; the Part 8 guide and the active-travel guide explain the two procedures and who may make a submission.

The line, the tax map and the prices

DART+ West electrifies the Maynooth line through Coolmine, Clonsilla and Castleknock under the railway order granted in July 2024, and the Phoenix Park Racecourse and Clonsilla schemes are priced on it. The RZLT map puts 984 hectares in 1,160 parcels inside the circle, much of it the undeveloped zoned land north of the N3 and the racecourse lands, taxed at 3% a year until built. The 385 commencement notices in 12 months are the extensions and the first phases of the schemes above, and the map's commencements layer places each. Fourteen hundred and seventy sales in a year at a median of €428,500 is the highest volume of any circle in these guides, which is what a district this size turns over, and the Explorer lists each sale beside the permission it was built under.

Frequently asked questions

What is being built in Dublin 15?

Within 4 km of Blanchardstown the register holds 909 applications lodged in 24 months, and the large ones are the Phoenix Park Racecourse LRD at Castleknock, the Clonsilla Inn lands at Porterstown, the apartments north of Tyrrelstown Plaza and the amended scheme on the Clonsilla Road. The rest are extensions, garages and infill houses.

Can I object to a development in Dublin 15?

Yes. A written submission to Fingal County Council with the €20 fee within five weeks of the council receiving the application, on planning grounds. Making the submission is what gives you the right to appeal the decision to An Coimisiún Pleanála. Eight applications inside the circle are within their window today; the Explorer link below lists them.

Which council decides applications in Dublin 15?

Fingal County Council for almost all of it, through the Castleknock, Blanchardstown-Mulhuddart and Ongar electoral areas. The Clonee edge of the district is in County Meath and decided by Meath County Council.

Why is Dublin 15 drawn as a circle?

There is no published boundary for a Dublin postal district; An Post's routing keys are not released as shapes. A 4 km circle from the centre of the district is the nearest honest proxy, and the facts box says what it takes in and misses.

The Hansfield guide covers the western edge of the district in more detail; the apartments guide has the LRD procedure the large schemes use. See everything in the circle on the Explorer, or open the Castleknock, Blanchardstown-Mulhuddart and Ongar electoral area pages.

Figures from the register on 14 September 2026 (live callouts refresh hourly); law checked 14 September 2026. Check with the council or a planning consultant before relying on this.