I would suggest that you book your accommodation as soon as you book your place on a tour.
Some hotels can be very busy in peak season and booking in advance is required.
Llandovery:
Suitable for tours starting in Llandovery.
The Castle Hotel, Llandovery – https://castle-hotel-llandovery.co.uk
The Kings Head, Llandovery – https://kingsheadllandovery.co.uk
The Drovers B&B – https://www.droversllandovery.co.uk/en
Llangammarch Wells
Suitable for tours starting in Llandovery (30 minutes) or Rhayader (35 minutes)
The Lake Country House Hotel and Spa – https://lakecountryhouse.co.uk
Sennybridge:
Suitable for tours starting in Llandovery (35 minutes).
Brecon Beacons Wild Camping – https://www.breconbeaconswildcamping.co.uk
Rhayader:
Suitable for tours starting in Rhayader or Llandovery (45 minutes) or Knighton (35 minutes)
Bryn Derwen B&B – https://www.brynderwenbedandbreakfast.co.uk
Ty Morgans – https://www.croesogrwp.com/tymorgans
The Lamb and Flag – https://www.croesogrwp.com/lambandflag
The Elan Valley Hotel – https://www.elanvalleyhotel.co.uk
Elan Oaks Campsite – https://www.elanoaks.co.uk/
Coco’s Wild Camping – https://www.cocoswildcamp.com
Llandeilo:
Suitable for tours starting in Llandovery (15 minutes) or Carmarthen (20 minutes).
The Plough Boutique Hotel and Restaurant, Rhosmaen – https://www.ploughrhosmaen.com
Aberystwyth:
Suitable for tours starting in Aberystwyth or Machynlleth (45 minutes).
Premier Inn – https://www.premierinn.com
The Starling Cloud – https://www.starlingcloudpubaberystwyth.co.uk
Gwesty Cymru – https://gwestycymru.wales
Tal Y Llyn:
Suitable for tours starting from Machynlleth,
Tyn Y Cornel Hotel, Tal-Y-Llyn – https://tynycornel.com – Dinner, bed and breakfast packages recommended
Knighton:
Suitable for tours starting in Knighton.
The White Horse, Clun – https://www.whitehorseclun.com/en
Ludlow:
Suitable for tours starting in Knighton (30 minutes).
The Clive Arms, Ludlow – https://theclive.co.uk
The Lion at Leintwardine – https://www.thelionleintwardine.co.uk
Porthmadog:
The Golden Fleece, Tremadog – https://goldenfleeceinn.com
Premier Inn, Porthmadog
Travelodge, Porthmadog
Port Merion Hotels and Self Catering – https://portmeirion.wales/stay