Frequently Asked Questions

Frequently Asked Questions on Tailte Éireann – Surveying.

Still Need Help?

Where is Tailte Éireann - Surveying located?

At present, the headquarters of Tailte Éireann - Surveying is located in the Phoenix Park, Dublin D08 F6E4. The office is closest to the Castleknock Gate entrance of the park, near Farmleigh House. To see a map of our location please click here.

How do I get to your office by public transport?

Dublin Bus

See Dublin Bus Route 37 Here.

Take the number 37 Bus originating in Baggot Street/Wilton Terrace as far as the Castleknock, Phoenix Park Main Gate bus stop. Alight the bus and walk through the park gates and keep going until you come to a roundabout. Turn right at the roundabout, and Tailte Éireann - Surveying is about 400 metres down Ordnance Survey Road.


See the Irish Rail timetable Here.

Departing from Connolly Station in Dublin City Centre, go to Ashtown Station, the nearest train station to Ordnance Survey Ireland. Exiting the station go towards the Navan Road, and cross the Navan Road at the Halfway House Roundabout. After 100m you will see the Ashtown gate of Phoenix Park. Enter the park, turn right after about 150m and continue on this road (the North Road) for about 500m. Go straight through the small roundabout and continue for about 400m; Tailte Éireann - Surveying is on the right hand side.

Map of our location

What is the most recent edition of the Dublin Street Guide?

The Dublin Street Guide, as with all of our Tourist and Leisure products, are updated regularly. The Dublin City and District Street Guide was updated in 2019. For more precise information on publication dates, prices, and ordering, see our online store Here.

Are Tailte Eireann - Surveying maps available to purchase online?

Tailte Éireann - Surveying has quite a large number of products available to purchase online.

Land Registry Compliant maps, Ortho Photography and Environmental Reports are available to download straight to your PC from our online store.

Historic maps, including the first edition Ordnance Survey dating from the 1830’s is available to view here.

Paper products, like the Dublin Street Guide, the Discovery Series and Adventure Series, and our extensive range of Tourism and Leisure products can be purchased from our online store.

Can I copy or reproduce an Tailte Éireann- Surveying map?

Topographic maps produced by Tailte Éireann - Surveying are protected under the terms of the Copyright Acts. Anyone wishing to reproduce this material, or use it as a basis for their own publications, must obtain a licence for which a fee may be payable.

For more information on our copyright policy please see here.

Historic Maps – Missing Sections

The historic map layers in GeoHive (6” and 25”) were scanned from the original series of County Maps, geo-referenced, put into one National Historic Dataset and is now publicly accessible in GeoHive. In part due to the original scanning process there may be some gaps in the overall coverage of the maps. If you find such a gap you may inform our Customer Service Team at The gap will be repaired by our team as soon as possible, and the update will appear in GeoHive when that service receives its regular update.

There is a mistake in one of your publications

Please contact us via the Data Quality Submission Form. Your observation will be forwarded for the attention of the production team in our mapping department where it will be investigated thoroughly. Should a correction or addition be required it will be applied to our mapping database. However, as this is a printed product, it is our policy to apply the change or correction to the next published edition of the map. We appreciate your comments and interest in Tailte Éireann and our products.

What if my Street Name is not correct on a map?

If the name of a street is incorrect on one of our maps we will correct it as quickly as possible. However, the process of correcting any omissions or errors usually involves the deployment of field staff to survey the road or area in question. It may also involve correspondence with the relevant local authority to confirm the particular name in question. For this reason the process of updating street names can be lengthy. Also if the street name is incorrect on a printed map it will be corrected in the next edition. If the matter is urgent please state the reason for the urgency to our customer services team and we will deal with the matter appropriately.

What if a Building is omitted or incorrectly placed?

Should you identify a building that has been omitted or misplaced on one of our Maps please report it Here.

The process of correcting any omissions or errors usually involves the deployment of field staff to survey the road or area in question. In some cases this work may fall under our normal update schedule for that area and hence may take up to a year to appear in our mapping. If the matter is urgent please state the reason for the urgency and we will deal with the matter appropriately.

My building is not correctly shaped?

The depiction of a building is a cartographic representation of what is on the ground. The actual shape of the building may not be depicted on our map as it seems on the ground. However, as buildings are now usually plotted from aerial imagery, particularly in rural areas, and our aerial imagery is regularly improving in quality, the detail on new buildings will become more accurate.

Can an your map indicate where my legal boundary is?

No. Topographic mapping produced by Tailte Éireann- Surveying does not depict legal property boundaries nor do we show property ownership on our mapping.

We only show the existence of physical features on the ground at the time of survey, which are surveyed to our specifications and accuracy standards. Although some property boundaries may be coincident with surveyed map features, no assumptions should be made in these instances.

Physical features on the ground change over time, and for this reason, We have a continuous mapping revision programme. In the event that there are changes to the physical features on the ground, this may involve our surveyors visiting your property so that the mapping can be updated and amended. However, such revision will not affect legal land ownership and title deeds of a property and registered title will not change unless authorised by Tailte Éireann - Registration. 

I feel that a feature is incorrectly shown on the your map; can you tell me why it is represented this way?

We do not keep records or surveyors’ notes of site visits. The map becomes the only record kept.

I require an Expert Witness to comment on the mapping, does you offer this service?

In property disputes i.e. land which both parties claim ownership, the courts look to Tailte Éireann to help. In all cases the signed 6” Boundary Sheet is accepted in court as a legal map. We have been subpoenaed to court on numerous occasions to comment on our mapping.

The Society of Chartered Surveyors Ireland (SCSI) provides a searchable database of Land Surveyors who can act as Expert Witnesses and prepare evidence for court. More information available here.

When were the Historic maps surveyed?

PRE 1824

One of the earliest known maps of Ireland was produced by Baptista Boazio in 1599. This predates the establishment of the Ordnance Survey by more than 200 years. At the end of the Cromwellian Wars in Ireland, the victorious soldiers had to be paid, so it was decided to pay them with the land confiscated from the native Irish. William Petty undertook a survey of the forfeited land; this became known as the “Down Survey” because it was plotted down and reproduced on paper.

Grand Juries, who were the forerunners of today’s County Councils, also commissioned maps of their areas. So, it can be seen that Ireland was very well mapped before the establishment of the Ordnance Survey.

Historic 6” (1:10,560) 1824 – 1846

Early in the nineteenth century it became obvious that the local taxes which were based on townland units in Ireland were inequitable. On the recommendation of the Spring Rice Committee, a survey of all Ireland at a scale of six inches to one mile was authorised by Parliament in 1824.

Historic 25” (1:2,500) 1888 – 1913

After the Great Famine 1845-49, many Irish landlords were forced by economic pressure to sell their properties and an “Encumbered Estates Court” was established in 1849 to deal with the flood of land transactions. The Judges found the six inch map too small for the precise area calculations required and eventually the Ordnance Survey was asked to supply estate maps which were replotted at 1:2,500 from the six inch field books and then field revised.

Post Independence

With the outbreak of the First World War in 1914, and the uprising in 1916 followed by the War of Independence, little mapping was carried out until the 1960’s, due to limited financial and human resources. Advances in technology from 1960’s on allowed OSi to engage with confidence in countrywide remapping programs again.

1:1,000 mapping was started in the early 1960’s. Statutory and administrative boundaries were transferred on to it from the 25” county series.

Rural areas were remapped by photogrammetry at 1:5,000, starting in the early 1990’s. Statutory and administrative boundaries were transferred on to it from the 25” county series.

For users particularly interested in Tailte Éireann - Surveying Historic Mapping, please visit our Historic Maps and Townland Viewer here.

The National Historic Maps dashboard shows our historic mapping services in a single view, and allows users to pan and zoom to their area of interest.

The National Aerial Imagery Dashboard shows our national imagery in a single view, and allows users to pan and zoom to their area of interest.

How often are maps updated?

Our single mapping database that feeds into The National Map and to all our digital and paper products is updated by theme; currently, the development of houses and buildings trigger localised and regional updates. Also, queries from customers are often resolved by updating the mapping in any particular area.

Ask On Support

If you have any questions and can’t find an answer in our FAQ’s, you can email our Customer Service team who will be very happy to help you.