Site report · 500 m radius · generated 13 Sept 2026, 00:48

Trimleston Avenue, Merrion

Eircode —Coordinates 53.31142, -6.20344Local authority Dun Laoghaire-Rathdown County Council

What closes soonest 1 open window

Observations close 16 Sept 20264 days left
D26B/0450/WEB — application received — Conversion of existing attic space comprising of modification of existing roof
5 weeks from receipt (12 Aug 2026) · s.34 Planning and Development Act 2000 · art. 29 Regulations 2001 · €20 to the council · 421 m away

Sources: acp, consult, moderngov, npad, rzlt · fetched 12 Sept 2026, 00:05

Source	Licence	Fetched	Link
acp	CC-BY-4.0	12 Sept 2026, 00:05	open
consult	public	12 Sept 2026, 02:04	open
moderngov	public	12 Sept 2026, 21:48	open
npad	CC-BY-4.0	12 Sept 2026, 20:38	open
rzlt	CC-BY-4.0	12 Sept 2026, 00:23	open

Where this is

Townland: Trimleston or Owenstown
Settlement: Dublin city and suburbs
Electoral division: Blackrock-Booterstown
Local electoral area: Blackrock
Local authority: Dun Laoghaire-Rathdown County Council
Parcel: Tailte Éireann 1871165 (freehold), 351 m²

Census 2022, small area 267019014

180

people

households

dwellings

74.4% owner-occupied, 21.8% privately rented, 0% social. Vacancy 4.8%.

Sources: places, parcels · fetched 11 Sept 2026, 21:28

Source	Licence	Fetched	Link
places	CC-BY-4.0	11 Sept 2026, 21:28	open
parcels	CC-BY-4.0	11 Sept 2026, 19:06	open

Zoning evaluated against the point

R2 — Existing residential county development plan 2022 2028 · 1 Apr 2022 – 1 Apr 2028

Objective A: A To provide residential development and improve residential amenity while protecting the existing residential amenities

What that means: An established residential area. The objective is to protect existing residential amenity as well as to provide housing — which is the objective a neighbour's objection to an overbearing extension is usually argued under.

Source: zoning · fetched 12 Sept 2026, 02:04

Source	Licence	Fetched	Link
zoning	CC-BY-4.0	12 Sept 2026, 02:04	open

Designations and constraints within 500 m

An OPW flood extent intersects this area. The OPW's map is licensed CC-BY-NC-ND, so we show a flag only — see the extent at floodinfo.ie.

Designation	Count	Examples
Natural Heritage Area (incl. proposed)	2	South Dublin Bay; Booterstown Marsh
Radon risk area	2	About 1 in 10 homes in this area is likely to have high radon levels; About 1 in 20 homes in this area is likely to have high radon levels
Record of Protected Structures	7	Dornden House; Glena; Saint Michael's
Special Area of Conservation	1	South Dublin Bay SAC
Recorded monument	9	Castle - tower house; House - 18th century; Armorial plaque
Special Protection Area	1	South Dublin Bay and River Tolka Estuary SPA

Sources: constraints, constraints.flood_cfram, constraints.nha, constraints.radon, constraints.rps, constraints.sac, constraints.smr, constraints.spa · fetched 11 Sept 2026, 19:11

Source	Licence	Fetched	Link
constraints	mixed — CC-BY-4.0 except OPW flood (CC-BY-NC-ND-4.0, publishable=false)	11 Sept 2026, 19:11	open
constraints.flood_cfram	CC-BY-NC-ND-4.0 · not redistributable — shown as a flag only	11 Sept 2026, 19:11	open
constraints.nha	CC-BY-4.0	11 Sept 2026, 19:11	open
constraints.radon	CC-BY-4.0	11 Sept 2026, 19:11	open
constraints.rps	CC-BY-4.0 (Fingal); public/attribution, unconfirmed (DLR)	11 Sept 2026, 19:11	open
constraints.sac	CC-BY-4.0	11 Sept 2026, 19:11	open
constraints.smr	CC-BY-4.0	11 Sept 2026, 19:11	open
constraints.spa	CC-BY-4.0	11 Sept 2026, 19:11	open

Residential Zoned Land Tax

This site is on an RZLT map — the draft map 2027 and the final map 2026 (1.4 ha). The owner is liable for an annual 3% tax on market value while it stays there. Submissions on the draft map closed 1 Apr 2026.

Source: rzlt · fetched 12 Sept 2026, 00:23

Source	Licence	Fetched	Link
rzlt	CC-BY-4.0	12 Sept 2026, 00:23	open

Planning applications 116 in 5 years within 500 m

Open for observation

37 Fosterbrook, Booterstown, Blackrock, Co. Dublin observations close 16 Sept 2026 · 4 days left
Conversion of existing attic space comprising of modification of existing roof
D26B/0450/WEBreceived 12 Aug 2026421 m away

Recent decisions and applications

Grant permission

Declare application invalid

Application declared inva

Grant permission for retention

No. 54 St. Helens Road, Booterstown, Blackrock, Co. Dublin, A94 VY04 Assessment Period
• Alterations to existing vehicular entrance to increase in width to 3.5M • Demo
D26A/0545/WEBreceived 17 Jul 2026318 m away
54, Woodbine Road, Booterstown, Co. Dublin, A94WF22 Assessment Period
Permission is sought for the extension and alteration of existing detached two s
D26B/0396/WEBreceived 10 Jul 2026395 m away
89, Trimleston Gardens, Booterstown, Dublin, A94HN73 Grant permission
A 26.5sqm. first floor extension to the side of the existing house requiring a
D26A/0472/WEBreceived 24 Jun 2026decided 14 Aug 2026237 m away
55 Trimleston Gardens, Booterstown, Blackrock, Dublin, A94 A3C3 S5 dec exempt
Installation of single roof window (Velux type) measuring approx 940mm x 1600mm
REF8626received 4 Jun 2026decided 24 Jun 2026244 m away
32, Trimleston Avenue, Merrion, Blackrock, Co. Dublin, A94X089 Refuse permission for retention
A roofed storage area to side and slightly beyond the front facade
D26B/0306/WEBreceived 25 May 2026decided 9 Jul 2026129 m away
55, Trimleston Gardens, Booterstown, DUBLIN, A94A3C3 S5 dec exempt
Proposed development consists of the installation of external wall insulation to
REF5426received 9 Apr 2026decided 29 Apr 2026244 m away
19 Trimleston Avenue, Blackrock, Co. Dublin, A94XD42 Grant permission
The development will consist of:1. Demolition of single storey shed to the rear,
D26B/0209/WEBreceived 7 Apr 2026decided 28 May 20260 m away
34, Woodbine Park, Booterstown, Dublin, A94A997 Grant permission & grant retention
The development for permission will consist of: • Alteration to the front wall a
D26B/0103/WEBreceived 20 Feb 2026decided 13 Apr 2026305 m away
16, Trimleston Gardens, Booterstown, Co. Dublin, A94VH26 Grant permission
a) single storey extension to rear of existing dwelling with rooflights; b) exis
D26A/0074/WEBreceived 9 Feb 2026decided 31 Mar 2026230 m away

`description` is truncated at source (80 chars for DLR, 70 for Fingal) and `applicant` is null nationally — NPAD publishes neither in full.

Source: npad · fetched 12 Sept 2026, 20:38

Source	Licence	Fetched	Link
npad	CC-BY-4.0	12 Sept 2026, 20:38	open

Appeals 19 in 5 years within 500 m

ACP 501691 on WEB1937/26 Pending
received 10 Jul 2026218 m away
ACP 501590 on D26B/0209/WEB Pending
received 22 Jun 20260 m away
ACP 500441 on D25A/0563/WEB Refused
received 9 Dec 2025decided 8 Apr 2026395 m awayinspector's report
ACP 322680 on D25A/0087/WEB Granted with conditions
received 3 Jun 2025decided 6 Oct 2025441 m awayinspector's report
ACP 321290 on D24A/0692/WEB Granted with conditions
received 20 Nov 2024decided 18 Mar 2025493 m awayinspector's report
ACP 321063 on D24A/0561/WEB Refused
received 15 Oct 2024decided 3 Mar 2025369 m awayinspector's report
ACP 321293 on D24A/0703/WEB Withdrawn
received 20 Nov 2024decided 19 Feb 2025493 m away
ACP 319584 on D24B/0043 Granted with conditions
received 23 Apr 2024decided 11 Oct 2024206 m away
ACP 319131 on D23A/0757 Granted with conditions
received 26 Feb 2024decided 24 Sept 2024223 m awayinspector's report
ACP 319250 on D23B/0576/WEB Granted with conditions
received 11 Mar 2024decided 3 Sept 2024265 m awayinspector's report

Source: acp · fetched 12 Sept 2026, 00:05

Source	Licence	Fetched	Link
acp	CC-BY-4.0	12 Sept 2026, 00:05	open

Commencement notices 28 in 3 years within 500 m

13 Castle Court, Booterstown, Dublin, A94T9P3 — Commencement notice
9 Jul 2026CN0144586DRD25B/0606/WEB497 m away
34 Woodbine Park, Blackrock, Dublin, A94 A997 — Opt out commencement notice
4 Jun 2026CN0143052DRD26B/0103/WEB313 m away
5 Bellevue Park, Booterstown, Dún Laoghaire-Rathdown, A94 RD45 — Commencement notice
1 Dec 2025CN0135987DRD24A/0873/WEB385 m away
73 Trimleston Gardens, Booterstown, Dún Laoghaire-Rathdown, A94 N529 — Short commencement notice
18 Nov 2025CN0135695DRD25B/0075214 m away
115 Saint Helen's Road, Blackrock, Dún Laoghaire-Rathdown, A94 FN82 — Opt out commencement notice
17 Sept 2025CN0133168DRD25A/0180/WEB172 m away
81 Trimleston Gardens, Booterstown, Dún Laoghaire-Rathdown, A94 HD45 — Short commencement notice
28 Aug 2025CN0132603DRD23B/0576/WEB276 m away
87 Trimleston Gardens, Blackrock, Dún Laoghaire-Rathdown, A94 P209 — Opt out commencement notice
18 Jun 2025CN0129822DRD24B/0383/WEB259 m away
13 Trimleston Road Booterstown, Blackrock, Dún Laoghaire-Rathdown, A94 F3P6 — Opt out commencement notice
9 Jun 2025CN0129329DRD24B/0519/WEB297 m away
Merrion Road, Dublin 4, D04 FY58 — Seven day notice
26 May 2025SN0012500DC3853/24293 m away
20 Saint Helen's Road, Booterstown, Blackrock, Dún Laoghaire-Rathdown, A94 CP38 — Opt out commencement notice
22 May 2025CN0128750DRD25A/0075/WEB279 m away

One notice can cover many buildings — count notices, never building rows, or a single multi-unit scheme reads as a trend (T11).

Source: bcms · fetched 12 Sept 2026, 23:34

Source	Licence	Fetched	Link
bcms	CC-BY-4.0	12 Sept 2026, 23:34	open

Sales 54 in 36 months within 500 m

€827,500

median price

€7,950/m²

median €/m²

sales

rooftop-geocoded

with listing detail

new builds

€320,000 – €2,060,000, 31 Jan 2024 to 12 Jun 2026.

Address	Sold	Price	Asking	Type	Beds	m²	€/m²	BER	Dist.
59 WOODBINE RD, BLACKROCK, DUBLIN	12 Jun 2026	€1,655,000	€1,495,000	Semi-D	4	190.7	8,679	C3	441 m
11 GROTTO PLACE, BOOTERSTOWN, DUBLIN	30 Apr 2026	€500,000	€495,000	House	1	58	8,621	F	467 m
50 ELM PARK, MERRION ROAD, BALLSBRIDGE	27 Mar 2026	€410,000	€375,000	Apartment	1	—	—	C1	305 m
221 LLANDAFF TERRACE, ELM PARK, MERRION	22 Jan 2026	€790,000	€750,000	Terrace	2	100	7,900	B3	157 m
49 CASTLECOURT, BOOTERSTOWN, DUBLIN	3 Dec 2025	€1,360,000	€1,350,000	Detached	4	170	8,000	D1	469 m
20 TRIMLESTON RD, BOOTERSTOWN, DUBLIN	28 Nov 2025	€1,150,000	€1,195,000	Semi-D	5	186	6,183	D2	353 m
36 DORNDEN PARK, BOOTERSTOWN, DUBLIN	22 Sept 2025	€1,311,000	€1,195,000	Bungalow	4	171	7,667	C3	56 m
43 ST HELENS RD, BOOTERSTOWN, DUBLIN	8 Aug 2025	€2,060,000	€1,900,000	Semi-D	4	261	7,893	B1	396 m
2 GROTTO PLACE, BOOTERSTOWN, DUBLIN	1 Aug 2025	€1,100,000	€825,000	Bungalow	3	105	10,476	D2	478 m
8 THE BAY ELM PARK, MERRION ROAD, BALLSBRIDGE	29 Jul 2025	€387,000	€320,000	Apartment	1	58	6,672	C3	271 m

PPR addresses are geocoded, not surveyed — a sale's position is as good as its address match (`rooftop_n` says how many are address-accurate). Beds, floor area, BER and asking price come from the matched daft.ie advertisement, not from the Register, and only where a match was found (`enriched_n`).

Sources: cara_listings, ppr · fetched 11 Sept 2026, 20:14

Source	Licence	Fetched	Link
cara_listings	Third-party advertisement data captured by Cara from daft.ie. Not open data: internal analysis only, no redistribution of listing content. Business-contact details (licensed PSP name and branch) are retained per Cara DECISIONS 2026-08-19; agent phone numbers and all vendor/buyer identities are dropped.	11 Sept 2026, 20:14	open
ppr	PSI — PSRA re-use terms (psr.ie/re-use-of-public-sector-information). Free re-use in any format provided the source and PSRA copyright are acknowledged, the data is reproduced accurately and not used misleadingly, and it is NOT used 'for the principal purpose of advertising or promoting a particular product or service'. Attribution: 'Contains PSRA Residential Property Price Register data, © Property Services Regulatory Authority.'	12 Sept 2026, 20:31	open

Consultations 2 matched by place

Cruise Passenger Realignment Project, Dun Laoghaire Harbour 38 days left
closes 21 Oct 2026Dún Laoghaire-Rathdown County Councillea-wide
Environment: Green Dog Walkers Pledge 110 days left
closes 31 Dec 2026Dún Laoghaire-Rathdown County Councilcounty-wide

Source: consult · fetched 12 Sept 2026, 02:04

Source	Licence	Fetched	Link
consult	public	12 Sept 2026, 02:04	open

Council items 4 in 24 months

National flag in Blackrock Park
Dún Laoghaire CHEPP Area Committee Meeting7 Sept 202615Dún Laoghaire-Rathdown County Council
Taking in Charge at Proby Place, Blackrock, Co. Dublin
Monthly County Council Meeting11 May 20266Dún Laoghaire-Rathdown County Council
Question in the name of Councillor Clodagh Ní Mhuirí
North Central Area Committee16 Feb 2026Q.46Dublin City Council
Report No. 199/2024 of the A/Assistant Chief Executive (M. Igoe)- With reference to the proposed disposal of the Council's Fee Simple interest at 41 Newtown Avenue, Coolock Industrial Estate, Dublin 17 to E TO INFINITY- For Blacklion Real Estate Fund.
Monthly Council Meeting7 Oct 202416(c)Dublin City Council

Source: moderngov · fetched 12 Sept 2026, 21:48

Source	Licence	Fetched	Link
moderngov	public	12 Sept 2026, 21:48	open

Capacity and public land

No publishable utility-capacity record within the radius. 20 records from Esb substation withheld: source licence forbids redistribution; see the operator's own register.

No site on the LDA register of relevant public lands within 500 m.

Sources: esbn, lda_lands · fetched 11 Sept 2026, 16:42

Source	Licence	Fetched	Link
esbn	all-rights-reserved (esbnetworks.ie disclaimer: personal/non-commercial, no modification or republication without written ESB permission) — permission NOT sought · not redistributable — shown as a flag only	11 Sept 2026, 16:42	open
lda_lands	CC-BY-4.0	11 Sept 2026, 16:43	open

Schools and public transport within 1.0 km

Schools

BOOTERSTOWN BOYS
primary188 pupilsCatholic406 m
St Andrews College
postprimary1011 pupilsPRESBYTERIAN659 m
OUR LADY OF MERCY CONVENT SCHOOL
primary247 pupilsCatholic708 m
Willow Park School
postprimary206 pupilsCATHOLIC805 m
Coláiste Eoin
postprimary517 pupilsCATHOLIC984 m

Stops 23 · routes 116, 118, 133, 181, 2, 4, 46n, 47, 7, 700, 702, 740, 740A, 740X, 7A, 7B, 7D, 7E, 7n, 845, 847, 84n, DART, E1, E2, S6, X1, X2

Bellevue Avenue
4, 7, 702, 7A, 7E177 m
Merrion Road
4, 7, 702, 7A, 7n, 84n178 m
St Helen's Road
4, 7, 7A, 7E234 m
Rock Road
4, 7, 7A, 7n, 84n246 m
Merrion Gates
4, 7, 7A, 7n, 84n443 m
Grotto Avenue
4, 7, 7A, 7E471 m
Merrion Gates
4, 7, 7A, 7E490 m
Booterstown
DART588 m

Sources: gtfs, schools · fetched 11 Sept 2026, 19:16

Source	Licence	Fetched	Link
gtfs	CC-BY-4.0	11 Sept 2026, 19:16	open
schools	CC-BY-4.0	11 Sept 2026, 16:41	open

Sources used in this report

Section	Source	Licence	Fetched
Location	places	CC-BY-4.0	11 Sept 2026, 21:28
Parcel	parcels	CC-BY-4.0	11 Sept 2026, 19:06
Zoning	zoning	CC-BY-4.0	12 Sept 2026, 02:04
Constraints	constraints	mixed — CC-BY-4.0 except OPW flood (CC-BY-NC-ND-4.0, publishable=false)	11 Sept 2026, 19:11
Constraints	constraints.flood_cfram	CC-BY-NC-ND-4.0 · not redistributable, flag only	11 Sept 2026, 19:11
Constraints	constraints.nha	CC-BY-4.0	11 Sept 2026, 19:11
Constraints	constraints.radon	CC-BY-4.0	11 Sept 2026, 19:11
Constraints	constraints.rps	CC-BY-4.0 (Fingal); public/attribution, unconfirmed (DLR)	11 Sept 2026, 19:11
Constraints	constraints.sac	CC-BY-4.0	11 Sept 2026, 19:11
Constraints	constraints.smr	CC-BY-4.0	11 Sept 2026, 19:11
Constraints	constraints.spa	CC-BY-4.0	11 Sept 2026, 19:11
Rzlt	rzlt	CC-BY-4.0	12 Sept 2026, 00:23
Planning	npad	CC-BY-4.0	12 Sept 2026, 20:38
Appeals	acp	CC-BY-4.0	12 Sept 2026, 00:05
Commencements	bcms	CC-BY-4.0	12 Sept 2026, 23:34
Sales	cara_listings	Third-party advertisement data captured by Cara from daft.ie. Not open data: internal analysis only, no redistribution of listing content. Business-contact details (licensed PSP name and branch) are retained per Cara DECISIONS 2026-08-19; agent phone numbers and all vendor/buyer identities are dropped.	11 Sept 2026, 20:14
Sales	ppr	PSI — PSRA re-use terms (psr.ie/re-use-of-public-sector-information). Free re-use in any format provided the source and PSRA copyright are acknowledged, the data is reproduced accurately and not used misleadingly, and it is NOT used 'for the principal purpose of advertising or promoting a particular product or service'. Attribution: 'Contains PSRA Residential Property Price Register data, © Property Services Regulatory Authority.'	12 Sept 2026, 20:31
Consultations	consult	public	12 Sept 2026, 02:04
Council items	moderngov	public	12 Sept 2026, 21:48
Capacity	esbn	all-rights-reserved (esbnetworks.ie disclaimer: personal/non-commercial, no modification or republication without written ESB permission) — permission NOT sought · not redistributable, flag only	11 Sept 2026, 16:42
Public land	lda_lands	CC-BY-4.0	11 Sept 2026, 16:43
Projects	social_housing	CC-BY-SA-4.0	11 Sept 2026, 20:13
Amenities	gtfs	CC-BY-4.0	11 Sept 2026, 19:16
Amenities	schools	CC-BY-4.0	11 Sept 2026, 16:41
Deadlines	acp	CC-BY-4.0	12 Sept 2026, 00:05
Deadlines	consult	public	12 Sept 2026, 02:04
Deadlines	moderngov	public	12 Sept 2026, 21:48
Deadlines	npad	CC-BY-4.0	12 Sept 2026, 20:38
Deadlines	rzlt	CC-BY-4.0	12 Sept 2026, 00:23

Generated 13 Sept 2026, 00:48 from the Planning Register store. Nothing on this page was fetched live: every figure was already in the store with the fetch time shown. Deadlines are derived from published receipt and decision dates under the Planning and Development Act 2000; confirm with the planning authority before relying on them.

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