Costello Windows or Costello Cowboys The Facts Six windows installed. Six windows leaking. Windowsills damaged during installation. Two windows cannot be opened as the windows. Draughts strong enough to quench a naked flame. Water ingress is ongoing and is damaging walls, carpets, ceilings & floorboards. No on site follow up to review the situation when I first reported the problem. Phone calls ignored. Emails also being ignored. Solicitor's letter ignored. Arbitration seems to be the first port of call when it comes to resolving issues with customers - see boards.ie. Salesman informed that this was phase one of the renovation, and that I would be installing another 14-16 windows (approx.), two patio doors and 1 back door in the new extension. One would think that this would have been incentive enough to ensure that the initial works were completed to a satisfactory standard. Eventally, a representative was sent out to assess the issues with the leaks. A feeble attempt was made to repair the windows. The windows are still leaking. Silicon was used on the bottom of the windows. This is not a standard practice. An email sent on 25/01/2025 to the directors of Costello Windows informing them that the windows are still leaking has been ignored, yet again! Unprofessional and rude to say the least. Second Opinion A second opinion was sought from 2 parties involved the construction business. Both were singing from the same hymn sheet, practically word for word. 1. The old window should have been removed and remedial works completed. This was not done. 2. Window measurements should have been taken after the remedial works were completed. This was not done. The windows were measured with the old windows still in place. 3. One party feels some windows may not even be the correct size. It was clear from the comments that Costello Winows lack the experience and expertise required for this profession or that they are indeed cowboys. Their approach to resolving issues of this nature lacks urgency, sincerity and is without question unprofessional. Plan of Action While the cost of reinstalling the windows is most definitely an issue, the bigger issue now is the principle of the matter i.e. that of an injustice. Going forward the plan is to. 1. Develop a dedicated page to "Costello Window or Costello Cowboys" on Facebook. All images from parties who have had similar experiences will be loaded to this page. 2. Form a collective for those who have had similar experiences and hire a solicitor to represent the group. 3. Lodge a complaint to the Competition and Consumer Protection Commission on behalf of the collective. 4. Initiate an Internet campaign using Trust Pilot, Google Review, Boards.ie, LinkedIn etc read more

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AVOID AT ALL COSTS!! Save yourself time, stress & money and look elsewhere. Awful finish on the inside of the windows which Costellos were made aware of after installation. Never did anything about it. See pictures. The window boards were installed in such an awful way. After asking Costellos to redo them, they were still dreadful. For a finish we had to get another windows company to complete this job. We eventually had the windows assessed in relation to air tightness. The porch, back door and all but 2 windows are leaking air and in need of serious remediation works. Costellos are refusing to carry out such works. See pictures. An employee of Costellos drilled into the frame of the porch window. This was done without any prior discussion and again Costellos refused to remedy the issue. See pictures. Their contract is solely to protect themselves when issues arise. They happily take your money but don't want to know beyond that. I've added pictures as proof so feel free to look. read more

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Absolutely do not use this company, I had windows and door fitted, substandard, leaking door, windows fitted so badly that is major condensation, rusting hinges, letter box and door knocker, seal around door leaking, appalling finish on all. Customer service not existent and so difficult to get anyone to help DO NOT USE I can send photos of the fitting of my windows and door to any one who needs to be sure to stay away from this company read more

First class service from Costello Windows. Ordered 1 front door, composite, and a french door for the back of house. Everything easy, from girls in the office to fitting. Products look and perform great. Top class. read more

For me Costello Windows was a great experience. Everybody in the office was so easy to deal with. My windows and one door were fitted perfectly and look great. Very Happy John read more

please keep clear of this company they are cowboys and are horrible to deal with. They used to be Costello windows and have left bad workmanship behind them. Same staff nothing has changed only they added one new word to their name. We have their windows 6 years now and are still fixing problems has they would not come and fix mistake they made. Just to let you know they love using silicone to fill the in the gaps between windows and walls. You have been warned. read more