I think that 'rebuilt' should be read as completed or altered (if the additions in 1850 were not on the original 1847 plans). Many churches of this period were built in stages as the monies became available, the usual route being to construct the main body of the church first - so that a roofed building was available for services in the quickest time. St. Margaret's Horsforth is a classic example of this, money being raised to allow the construction of the nave, chancel and aisles in the first instant. Some years later, when the town's people had raised more money, the construction was completed with the addition of the two porches, the tower and steeple, vestry and organ loft.