They want local government to find a solution to the problem.
Three heritage sites in Offaly are among the most at-risk in the country, according to An Taisce.
The house and outbuildings at Durrow Abbey, mill buildings and industrial structures from the old sawmills in Clara, and the original stable block at Charleville Castle have all been listed as problem areas.
An Taisce's National Advocacy Manager, Ian Lumley, says they're highlighting the issue in the hope local development groups and the County Council can come together to find a solution.
He says they are three impressive 19th century landmarks, and should be maintained for heritage and safety purposes:
Midlands Beautician Turned Tarmac Layer Sing Trades Praises
Laois Company Wishes Rose Of Tralee Luck For DWTS Final
Regional March For Gaza Taking Place In Offaly Tomorrow
Digital Career Skills Platform Launches For Midlands
Canadian Ambassador To Ireland Visits Offaly
Laois Council Moves To Acquire Derelict Building On Main Street
Offaly TD Demands Stronger Ticket Touting Laws As Six Nations Prices Hit €3k
Offaly Hotel Manager Highlights Lack Of HSE Staff To Register Marriages In County
Threshold Express Concern Over Excessive Short Term Lets
New Highly Skilled Midlands Jobs Announced
Wind Chill Expected To Bring Back Winter Feeling
Pieta House Expected To Close Midlands Services
Westmeath Hotel Applies For New Wellness Centre
Midlands MEP Demands Stronger Disability Access Laws
Tullamore Lions Club Named All Ireland Club Of The Year
€366k In Compensation Paid Last Year For Pothole Damage To Motorists
Offaly Councillor Expresses Concern On 'Nearest School' Rule For Online Admission
High Court Hears Moving Enoch Burke To Castlerea Prison Was 'Lawful'
IFA Welcome Plan To Dredge Parts Of River Shannon In Offaly
Regional Enforcement Authority To Prevent Illegal Peat Extraction Still Being Formed