Derreen

28 registered freehold parcels lie mostly in Derreen, from 416 m² to 224,319 m² (22.43 ha, 55.43 acres). The dashed line is the townland's boundary; 13 neighbouring parcels touch it.

Download the townland: DXF, in Irish Transverse Mercator metres, with its boundary, parcels and buildings; GeoJSON or KML.

No zone of a development plan covers Derreen in the national zoning. Outside zoned towns and villages, the county development plan's rural policies apply to each application.

Source: Tailte Éireann and the Department of Housing (MyPlan), national zoning, CC BY 4.0.

• 1 Mar 2026Refused

  Permission to extend and renovate an existing dwelling house. The works will include: 1. The construction of an extension to the rear of the existing dwelling, 2. The demolition of an existing rear extension, 3. The removal of 2 no. existing chimneys, 4. The decommissioning of an existing septic tank serving the existing dwelling house and to replace it with a new wastewater treatment system and percolation area together with all associated site works at

  Permission · Roscommon County Council, 2660085

• 23 Feb 2026N/a

  Planning permission to extend and renovate an existing dwelling house. The works will include: 1. The construction of an extension to the rear of the existing dwelling 2. The demolition of an existing rear extension 3. The removal of 2 no. existing chimneys 4. The decommissioning of an existing septic tank serving the existing dwelling house and to replace it with a new wastewater treatment system and percolation area together with all associated site works at

  Permission · Roscommon County Council, 2660075

Source: National Planning Applications, Department of Housing, Local Government and Heritage, CC BY 4.0. Applicants are not shown.

Designated sites

• Special Area of Conservation: Bellanagare Bog SAC 000592
• Special Protection Area: Bellanagare Bog SPA 004105
• Proposed Natural Heritage Area: Bellanagare Bog 000592

Recorded monuments

• RO015-044 Ringfort - rath
  Description

  Marked as a circular enclosure (diam. c. 35m) on the 1837 ed. of the OS 6-inch map, and situated on a level landscape. It is not visible at ground level in pasture. Compiled by: Michael Moore Date of upload: 24 August 2010

Architectural heritage

No building of the National Inventory of Architectural Heritage stands in the townland of Derreen.

Designated sites: National Parks and Wildlife Service. Recorded monuments: Sites and Monuments Record, National Monuments Service. Buildings: National Inventory of Architectural Heritage. Department of Housing, Local Government and Heritage, CC BY 4.0. Works at or in relation to a recorded monument need two months' written notice to the National Monuments Service (National Monuments (Amendment) Act 1994, section 12).

Radon

About 1 in 20 homes in this area is likely to have high radon levels. Testing a home

Landslides

Susceptibility moderately low, low, on the 1:50,000 map.

Terrain model

No LiDAR survey of the Office of Public Works covers the centre of the townland of Derreen.

Flooding

The flood maps of the Office of Public Works: floodinfo.ie.

Radon Risk Map of Ireland, Environmental Protection Agency; Landslide Susceptibility Classification, Geological Survey Ireland; both CC BY 4.0. LiDAR: contains Irish Public Sector Data (Geological Survey Ireland & the Office of Public Works) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence.

No address of the register names Derreen with five sales or more. The sales of the area are on the page of Co. Roscommon.

Name

Derreen · An Doirín

Area

1,032,315 m² (103.23 ha, 255.09 acres)

Civil parish

Kilcorkey, and its townlands

Barony

Castlereagh

Electoral division

Bellanagare, the unit of the census

Census 2022

Bellanagare electoral division: 693 people in 279 households; 85% of households own their home; 31% of homes were built since 2001; 17% of dwellings stood vacant on census night, and 7% were holiday homes.

Neighbouring townlands

Cashel, Cornamucklagh and Falmore, Knockroe, Leggatinty, Mullen

Placenames

Derreen on logainm.ie, the Placenames Database of Ireland

Townlands, civil parishes, baronies and electoral divisions, National Statutory Boundaries, Tailte Éireann, CC BY 4.0. Census 2022, Small Area Population Statistics by electoral division, Central Statistics Office, CC BY 4.0. A townland is the smallest land division of Ireland, and the unit of a rural address; old registers such as the 1901 and 1911 censuses file it under its civil parish and barony.