Old adhesive, nails and paint can affect removal and surrounding finishes. Show the condition before work is agreed. Some local making-good may need separate scope; replacing a run should not be sold as guaranteed damage-free removal from every existing wall.
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.
Internal corners, external corners and returns affect the cutting and joining plan. Rooms are not assumed perfectly square from a sketch. The aim is suitable ordinary decorative joints, with any existing wall irregularity discussed before promising a flawless straight line.
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.