The next alteration took place about 1220, and was the erection of a new south transept in place of the Norman one, which, as has been said, almost certainly had no aisle; then followed in about twenty years the north transept and the chapter-house, with its vestibule, all these buildings being in the Early English style, though the difference in their times of erection is clearly marked in their details. Two royal licences to dig Hopwas stone for "the new fabric of the church at Lichfield" in 1235 and 1238 are evidence that work was going on about this time; and the desire of Henry III. (which is more fully set out in the description of the interior of the transept) to have a roof at Windsor like that of Lichfield gives an almost documental certainty to the architectural theory that the transepts were built at the time above stated.

No historical document exists that can apply to the building of the nave; but that must have come next, and have been in progress almost before the north transept could have been finished. The west front was commenced somewhere about the beginning of the last quarter of the thirteenth century, and, including the two towers which form such an important part of it, must have taken a very long time to complete. From the thorough examination made when the recent restorations were in progress, it was decided that these towers were built in three distinct stages—the lowest, which just included the row of kings, being assigned to about 1280; the next stage to 1300; and the upper part, including the belfry windows, to about 1330, while the spires were not finished till some time after.

Walter de Langton became bishop in 1296, and of him it is distinctly recorded that he commenced the Lady Chapel. From an old register in the Salt Library at Stafford, it appears that Langton left £80, 13s. 3d. for the building of the chapel. He died in 1321. And, in 1323, there is another entry showing that the chapter came to some agreement with his executor by which each party should pay half the cost of finding a quarry for the stone; so that it does not appear that building operations had proceeded very far at his death. It is interesting to note, as the same source shows us, that the money left by the bishop was partly on loan to King Edward II. for the expenses of his wars with Scotland, which wars had ended so disastrously at Bannockburn. In the following reign, Edward III. was asked by the chapter to repay what was still owing of this money.

The Lady Chapel was probably erected beyond the eastern end of the church as it then stood; and while this was being done, the Early English presbytery was taken down and rebuilt in the Decorated style to match the new Lady Chapel, and the old clerestory of the choir was also rebuilt in the same style. The main idea was to obtain uniformity; but as it apparently was not proposed to take down the sacristy on the south, nor the chapter-house on the north, it was not considered necessary to pull down the choir—i.e. the last three western bays—any lower than the triforium; for the lower parts would be hidden by these buildings from the outside, and inside various shifts were resorted to to obtain uniformity. The work almost certainly grew from east to west gradually, as the clerestory of the choir end is lighter than that of the eastern or presbytery end; so that no doubt the pulling down of the old choir clerestory was only done after the building of the eastern end made it seem better to alter the rest into uniformity. With regard to the inside effect, Professor Willis says: "The front half of their pier arches (those belonging to the three western bays), however was removed and mouldings given them corresponding to those of the new presbytery. Their piers also were slightly altered, although partially concealed by the choir stalls. By these arrangements the aspect of the whole interior of the choir and presbytery was made uniform." How far this theory is sound will be seen when the alterations early in the present century are considered in their place.

Bishop Langton also erected the shrine of St. Chad at an expense of £2000. This shrine stood behind the high altar in the most eastern bay of the retro-choir, and, as was usual, had on its western side an altar dedicated to the saint. A similar arrangement can still be seen in Westminster Abbey, where the shrine of Edward the Confessor stands behind the reredos. The space behind the reredos, with the corresponding bays of the aisles, were in the past called the lady choir. This portion was separated from the rest of the choir by the reredos in the centre, and by screens in a line with the reredos in the aisles; there was a chapel in the lady choir at the end of each aisle, but to whom they were dedicated is doubtful. Stukeley, writing in 1715, says: "In St. Peter's Chapel, which is now a place to lay scaffolding and ladders, etc., was painted upon the wall St. Peter crucified with his head downwards, and two other apostles, etc. And in this place is the noted St. Chad's tomb, though defaced, removed from the lady choir to be put here since the Restoration." The same writer also tells us that: "Over across the middle of the said choir was a rood loft, finely carved and gilded, and St. Chad's shrine, but destroyed in time of war."

Professor Willis has pointed out the singular parallelism between the development of this cathedral and that of York. "The Norman Cathedral of York was built in 1080, and that of Lichfield at an uncertain date. Between 1154-1181, Archbishop Roger substituted for the original chancel at York a long, square-ended choir, with the aisle carried behind the end. At Lichfield, during the same period, the large chapel was built at the end of the Norman apse; and about the beginning of the thirteenth century the whole Norman eastern termination was, as at York, replaced by a long, square-ended choir with the low aisles behind. Next, at York the Norman transepts were rebuilt in Early English: the south transept, 1230-1241; followed by the north transept, 1241-1260. Also at Lichfield the Norman transepts were rebuilt in Early English, beginning with the south and ending with the north. The Early English work of this cathedral is shown by the licences to dig stone to have been in progress in 1235 and 1238. York nave and Lichfield were next rebuilt in Early Decorated—the first in 1291-1324. Lastly, at Lichfield, the elongation of the eastern part was begun at the extreme east, beyond the existing choir by the Lady Chapel, in late Decorated under Bishop Langton, 1296-1321, and followed by taking down the choir, and continuing the same work on its site westward. The works at York followed in the same order, but forty or fifty years later, by first erecting the presbytery outside the existing choir, and then taking down the latter and continuing the work of the presbytery to form the new choir. The plans of the two cathedrals rival each other in the simplicity of their proportions."

One other important thing which Bishop Langton did was to fortify, or at any rate to add greatly to the fortifications of the cathedral. He surrounded the close with a high stone wall and constructed "two beautiful gates" on the west and south sides of the close. Truly, had he been able to see the result of his fortification, he might have said with the Preacher: "All is vanity and vexation of spirit"; for if there was one thing which brought down on the cathedral the extremities of hatred and violence in the Civil Wars, it was that it proved able to be held as a fortress against those who came up against it.

Bishop Langton built also the palace, which for so long, with its towers and turrets, stood in the north-east corner of the close. It must have been a magnificent building, and we know that its hall was decorated with frescoes of scenes in the recent wars. It was destroyed after the siege of the close in 1643, and Fuller, writing about that time, speaks of it as the "invisible castle now vanished out of sight."

Roger de Norburg completed the Lady Chapel and the new presbytery, and was succeeded by Robert de Stretton, who (as we discover from a document dated 1390, four years after his death) completed St. Chad's shrine; for that is the only meaning which can be given to the wording of the bond, that the vicar's choral should offer prayers for, amongst others, "Robert Stretton, bishop, for making St. Chadd's shrine, and for giving them £24 to continue amongst them."

There has recently been discovered among the muniments of the chapter, an indenture dated in 1345 or 1346, and made between the sacrist on the one hand, and the dean and chapter on the other, for the safe custody of the goods in the sacristy. The "goods" are too numerous for a list of them to be given, but they include "the head of Blessed Chad, in a certain painted wooden case; also an arm of Blessed Chad; also bones of the said saint in a certain portable shrine." Then follows a list of the bones and relics of a large number of saints, including part of the sepulchre of Our Lord, and part of St. Peter's cross. There were also crosses, gold, and silver, and jewelled—a large number of many kinds, all set out separately—mitres, jewels, chalices, copes, and every kind of vestment of the most gorgeous description. Bishops and kings and queens had apparently showered their wealth and valuables upon the cathedral; and with the subscriptions of the diocese, known as Chad's Pennies, and the offerings of pilgrims, the riches of the cathedral seem to have been enormous. These "goods," in many cases with their donors' names, are all set out in the roll, which, it is interesting to notice, is dated in the year of the Black Death; possibly the enormous mortality of the time may have made it seem necessary that the mere memory of man should not be depended upon when so few seemed likely to survive. To read the list is to get some notion of the magnificence of the services; and it is no wonder that pilgrims came from all parts of the diocese, and of England, to worship where so many relics were collected. The mid-Sunday in Lent was originally the time, afterwards Whitsuntide, for the crowds to attend the cathedral. They were shown the head of St. Chad, probably from the little gallery in the south aisle of the choir, and then they laid their offerings at the great shrine, on which were lying the other relics of the saint.