\rWood flooring repairs may cost between £30 and £45 per square foot, if you need floor joist replacement. If you want to sister your floor joists, it may cost around £80 to £100 per joist. \r \rWhen it comes to minimal replacements, the price ranges from £1,600 to £4,000 on average. If you want your entire room’s flooring replaced, you can expect to pay around £4,000 to £8,000. \r