Scheduled Monument

Seagate CastleSM320

Status: Designated


Where documents include maps, the use of this data is subject to terms and conditions (

The legal document available for download below constitutes the formal designation of the monument under the Ancient Monuments and Archaeological Areas Act 1979. The additional details provided on this page are provided for information purposes only and do not form part of the designation. Historic Environment Scotland accepts no liability for any loss or damages arising from reliance on any inaccuracies within this additional information.


Date Added
Last Date Amended
Supplementary Information Updated
Secular: castle
Local Authority
North Ayrshire
NS 31930 39157
231930, 639157


The monument consists of the sixteenth century remains of Seagate

Castle and its adjoining courtyard.

The house which faces the Seagate in Irvine is roughly rectangular on plan with three external towers (one triangular and two circular

stair towers) projecting to the E. It has external dimensions of approximately 30m NW-SE by 12m NE-SW and 10m high to the wallhead,

with gables about 12m high. The two storey building is of mortared rubble and has crow-stepped gables. Its ground floor is vaulted throughout. The ground floor vault in the S is covered over with

turf. Only the N portion of the upper storey is intact. At the centre

of the facade is a round-arched doorway with late medieval

decoration. From this entrance, a passage with guard-rooms on either side leads to the rear courtyard. Communication with the upper floor was possible by the S stair towers (the S-most probably ascended to

the hall). The surviving upper rooms open through each other and

contain fine fireplaces and windows with cable and dog-tooth

mouldings. In the N section of the ground floor is the kitchen. Waste from the kitchen and first floor guardrobes drained into a cesspool

in the courtyard. There has been a range of buildings along the N boundary wall.

The area to be scheduled is irregular and measures a maximum of 45m

E-W by 40m N-S to include the castle and rear courtyard, including

the boundary wall which defines the area on all sides except the SE,

as shown in red on the accompanying map.



No Bibliography entries for this designation

About Scheduled Monuments

Historic Environment Scotland is responsible for designating sites and places at the national level. These designations are Scheduled monuments, Listed buildings, Inventory of gardens and designed landscapes and Inventory of historic battlefields.

We make recommendations to the Scottish Government about historic marine protected areas, and the Scottish Ministers decide whether to designate.

Scheduling is the process that identifies, designates and provides statutory protection for monuments and archaeological sites of national importance as set out in the Ancient Monuments and Archaeological Areas Act 1979.

We schedule sites and monuments that are found to be of national importance using the selection guidance published in Designation Policy and Selection Guidance (2019)

Scheduled monument records provide an indication of the national importance of the scheduled monument which has been identified by the description and map. The description and map (see ‘legal documents’ above) showing the scheduled area is the designation of the monument under the Ancient Monuments and Archaeological Areas Act 1979. The statement of national importance and additional information provided are supplementary and provided for general information purposes only. Historic Environment Scotland accepts no liability for any loss or damages arising from reliance on any inaccuracies within the statement of national importance or additional information. These records are not definitive historical or archaeological accounts or a complete description of the monument(s).

The format of scheduled monument records has changed over time. Earlier records will usually be brief. Some information will not have been recorded and the map will not be to current standards. Even if what is described and what is mapped has changed, the monument is still scheduled.

Scheduled monument consent is required to carry out certain work, including repairs, to scheduled monuments. Applications for scheduled monument consent are made to us. We are happy to discuss your proposals with you before you apply and we do not charge for advice or consent. More information about consent and how to apply for it can be found on our website at

Find out more about scheduling and our other designations at You can contact us on 0131 668 8914 or at


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Printed: 25/06/2022 14:59