Ar fap degwm 1844 o Abergwaun, mae ‘Wallis Street’ wedi’i nodi mewn gwyrdd gyda safle ‘Capel Wallis’ wedi’i nodi gan ddot coch ar ben y stryd ar y dde. Dywedir i lawer o gerrig y capel gwreiddiol gael eu cario i lawr gan yr aelodau i’w hymgorffori yn yr adeilad newydd.

Adeiladwyd y capel presennol ym 1845 mewn arddull Is-Glasurol gyda chynllun mynedfa talcen, to hanner talcennog, deulawr a ffenestri pen gwastad wedi’u gorchuddio â bleindiau. Mae ffenestr wyntyll uwchben y drws canolog ac mae ganddo dalcen o’i amgylch sy’n cynnwys carreg gyda’r arysgrif ‘Tabernacle Independant Chapel 1845′.

Mae’r tu mewn yn dyddio o waith adnewyddu llwyr a ddechreuwyd ym 1925, ond oherwydd y Rhyfel Mawr, ni chafodd ei gwblhau tan 1924. Mae blaen yr oriel wedi’i addurno’n addurniadol â manylion wedi’u gwneud o bren caled a phlastr paris wedi’i fowldio. Ceir pwlpid hanner crwn sy’n sefyll ar sail wythonglog, gyda cholofnau a motiffau clasurol. Ceir mynediad iddo ar y naill ochr a’r llall.

Roedd y gwaith a wnaed ym 1924 yn cynnwys gosod yr organ bib y tu ôl i’r pulpud. Mae’r Tabernacl bellach yn Rhestredig Gradd 2 am ei du mewn hynod addurnedig.

It was decided in the early 1840s that with the increasing size of the congregation and what was felt, a poor location of the existing chapel ( at the top of a steep, rough hill) a new chapel was needed and in 1844, a piece of land was purchased in what is now known as Park Street. The Chapel was built at a cost of £800 which included the adjoining house and the creation of a graveyard to the rear.  It was opened on the 7th May 1845.On the extract of the 1844 Fishguard tithe map – Wallis Street is marked in green with the site of Wallis Chapel marked by a red dot at the top of the street on the right. It is said that many of the stones of the original chapel were carried down by its Members to be incorporated in the new building.

The exterior of the current Chapel in Park Street has altered little since it was built in 1845 however the interior was refurbished and completed in 1924. The building is Grade 2 listed because of its ornate interior.