Show the finished floor and any planned change to flooring. The new skirting needs an agreed position at that junction. Decorative trim is not a way to conceal unresolved floor movement, and flooring alteration is not automatically part of a skirting replacement quote.
Height, thickness and shape affect the match with adjoining trim. Send a profile sample or product specification before ordering lengths. A close front-view resemblance may still leave a different projection at door surrounds or corners, so compatibility needs review.
Suitable fixings depend on the sound wall and trim material. Hidden services and uncertain substrate need care before drilling. This ordinary decorative task does not include structural wall repairs or permission to attach trim wherever a fixing happens to hold.
Remove the agreed decorative runs, fit compatible replacement skirting with suitable joints and fixings, and prepare the agreed finish. Scope limits: Complete ordinary decorative runs only. No structural wall work, hazardous materials, concealed-service alterations or repair of underlying floor movement.