In the year 1812 we meet with the following remark from Mr Thomas in his notebook - "For six weeks after the 10th of May I did not preach at all being much indisposed in my body. During this period the excellt. Mr. Fuller paid us a visit. He preached in our place May 31st at 11 o'clock, forenoon. His text was Ps. 86.17 Shew me a token for good."
June 1st, he preached in Trosnant at 2.30 pm from Acts 12.24; June 3rd, he preached at the Association at Hengoed from Isaiah 9.7 the last clause; June 4th, he preached at Zion Chapel Merthyr at 6 o'clock in the evening from John 3.35; June 7th, he preached in the Back-lane meeting house at Swansea at 3 o'clock from John 17.20, 21; June 8th, he preached at Carmarthen in the Tabernacle at 7 o'clock from Phil. 3.8; June 10th, he preached at the Association at Cwm Felin Monach (Cwmfelin Mynach) in Carmarthenshire from John 17.(20), 21. Afterwards he returned to Bristol. June 21st, returned to my work and preached in Abergavenny."
For many years Mr Thomas and the church met in the old building in Heol Tydur, which belongs to the Welsh Brthren of Llanwenarth, but with the increase of the church and the hearers growing, they had to look for a more spacious and convenient place. As a consequence they built a bigger place of worship; this one had a gallery and there was also a vestry and a burial ground at the back. The building stands at the bottom of Frogmore Street. The foundation stone was laid by Mr Thomas himself on July 6th, 1815. The building, an oblong square, measures 60 feet in length and in 36 feet in width and is big enough to take comfortably 500 or 600 people. A Sunday School was established at the same time and it still co-exists and co-operates with the church.
March 17, 1815, Mr Thomas preached his last sermon in the old building from Isaiah 53:10 and at the end of the service excitedly said this "I hope it is the prosperity of God's good pleasure in the hand of Christ that has rendered it needful for us to erect a larger place than this in which now for the last time we meet. The prophet says in the next chapter viz Isa 54.1-4 Enlarge your tent, etc. Permit me to run over just some of the circumstances with regard to the cause amongst us since the 8th of January, 1807, when I preached for the first time in this pulpit, down to the present time, that is 17th of March, 1816; and is it arrogant for me to say surely the pleasure of the Lord has prospered in the hand of Christ here? May it be made to prosper among our brethren that will continue to worship here from Sabbath to Sabbath. And may it increasingly prosper among us in the laceto which we go." March 24th, Mr Thomas preached his first sermon in the new building from 1 Kings 9:3; this was an appropriate text. And the Lord said unto him, I have heard thy prayer and thy supplication, that thou hast made before me: I have hallowed this house, which thou hast built, to put my name there for ever; and mine eyes and mine heart shall be there perpetually.
