Giving notice to tenants

As you said the important aspect is follow the procedure to the letter of the law and make sure there is no room for the tenant to challenge the validity of the notice. Also whatever the statutory notice is give a few extra days just in case you get delayed delivering the notice etc.

As for informing the tenant in my opinion the best approach is to do it in person. I did that and for the notice i printed a few copies and got the tenants to sign and date them. It will help with the validity of the notice but alas after that you are in the lap of the Gods as to if the tenant will move-out on time or overhold. Best of luck.

What is the reason for the notice? Selling up?

Recorded delivery is better than registered post. They can always refuse to sign for registered post. The important thing is to keep proof of posting.

While they may give some advice, RTB do not provide an advisory service for landlords. They will not do a detailed review of document to ensure that all legal angles are covered. A solicitor is needed for that.

OP, you need to think about what is the best way to manage the relationship with the tenants so they do their best to move out when you want them to, or before. Even if they want to, it will be challenging. You have a LOT to lose if they don't move, so you need to do everything you can to reduce the chance of that happening.

If it were me, I'd do the driving, and talking to them about how I'm open to them moving out as soon as they find somewhere, and promising that they can stop paying rent the day they move out.

A person need not sign for registered post. Many people don't. That means the person who sent registered post only has evidence of posting not of receipt, or delivery.

AN Post do indeed provide a service where they record delivery, The RTB avails of it when sending documentation to parties in cases.

Its all important. Making sure the term is calculated correctly, making sure the notice to tenants and notice to RTB are on the same day, making sure the wording is correct...... its not all about the statutory declaration.