II*Inns & shops · listed 1991Penallta Colliery Engine Hall and Fan HousePhoto: Kev Griffin · CC BY-SA 2.0
Old Fire Station · Photo: Jaggery · CC BY-SA 2.0B−History Grade
History of Ystrad Mynach · Cadw
15 listed buildings, 3 of them Grade II*
On the Cadw list, all of them stand inside Ystrad Mynach’s built-up area, 13 for every 10,000 residents. 12 of Ystrad Mynach’s listed buildings are Grade II. 29% of its homes were built before 1919. We have photos of 7 of its listed buildings. Ystrad Mynach grades B− for history: #15 of 38 in Gwent.
Listed buildings
15
13 per 10,000 residents
Grade I
0
exceptional interest
Grade II*
3
more than special interest
Scheduled monuments
0
nationally important sites
Homes built before 1919
29%
typical UK town 15%
In pictures
Ystrad Mynach in 7 photos
Nearly every Grade I and II* building, photographed. Tap a photo to step through them full screen.
Penallta Colliery Engine Hall and Fan HouseGrade II* listed
Capel Hengoed (also known as Hengoed Baptist Chapel)Grade II listed
Ystrad Mynach South Signal BoxGrade II listed
Church of Holy TrinityGrade II listed
War MemorialGrade II listed+2See all photosPhotos from Wikimedia Commons and Geograph, copied to our own server, each credited to its photographer with its licence; names open the building’s page or its official list entry.
The map
Where Ystrad Mynach’s history is
Every Grade I and II* building, monument and historic park, over the age of each neighbourhood’s homes.
Grade II*
Homes built before 1919, by neighbourhoodunder 10%10–25%25–50%50%+
1 of 7neighbourhoods have mostly pre-1919 homes; in the oldest, 79% were built before 1919.
Hover a dot for its name; tap one with a photo to open it.
15 listed buildings by grade
0 Grade I3 Grade II*12 Grade II
Cadw lists buildings of special architectural or historic interest in three grades: Grade I for buildings of exceptional interest, Grade II* for particularly important buildings of more than special interest, and Grade II for buildings of special interest. Listing protects the whole building, inside and out.
Every entry on Cadw’s register of listed buildings whose point lies inside the ONS 2022 built-up-area boundary. One list entry can cover a terrace or a group of buildings. Neighbourhood dots: the population-weighted centre of each Census 2021 output area, coloured by its neighbourhood’s (LSOA’s) share of homes built before 1919 (Valuation Office Agency, March 2025).
Grade II*
The 3 Grade II* listed buildings in Ystrad Mynach
Particularly important buildings of more than special interest. 2 are photographed. Each opens its own page, with the official list entry.
II*Inns & shops · listed 1991Penallta Colliery No.2 HeadframePhoto: Jaggery · CC BY-SA 2.0
Inns & shops · listed 1991Penallta Colliery Baths Building
Grade II
12 Grade II listed buildings
Most listed buildings are in this grade, which covers buildings of special interest. Open any building to read its official list entry.
All 12 Grade II listed buildings, A to Z
Conservation areas
2 conservation areas cover 2% of Ystrad Mynach
Areas the council protects as a whole: demolition and changes to how buildings look need consent, and trees are protected.
Tredomen 19936 ha
Maesycwmmer/ Hengoed 19932 ha
8 hain conservation areas, of 379 ha inside the built-up area.
The first, Tredomen and Maesycwmmer/ Hengoed, were designated in 1993; the newest, Maesycwmmer/ Hengoed, in 1993. 1 of the 15 listed buildings stand in one.
Cadw’s conservation areas via DataMapWales. Hectares are the part of each area inside the built-up area.
How the list grew
7 of Ystrad Mynach’s 15 listed buildings were added in 1991
The year each building now on the list was first listed.
1991 · 7
19501960197019801990200020102020
The first 1 entry was listed in 1985. 7 came in 1991. Only 3 have been added in the last 15 years.
History Grade
Ystrad Mynach grades B− for history
Protected heritage and the age of the town’s homes, against all UK towns.
Protected heritage, for its size and in all (18 points, 15 per 10,000 residents)More than 38% of UK towns
Homes built before 1919 (29%)More than 81% of UK towns
Two measures, each ranked against every UK town of 1,000 or more, with protected heritage counting twice as much as the age of homes. Protected heritage counts each listed building by its grade (Grade I three points, II* two, II one), each scheduled monument and battlefield two, and each registered park or garden by its grade; it is ranked both per 10,000 residents and as a total, so a village with one fine church doesn’t outrank a historic city. The second measure is the share of homes built before 1919, from the Valuation Office Agency’s council tax records. History is a character grade: it describes the town and isn’t part of the overall grade.
Homes by age
29% of Ystrad Mynach’s homes were built before 1919
Every home by when it was built, from council tax records, against England & Wales (the dark tick).
11%
Before 1900
17%
1900–18
7.9%
1919–29
0.6%
1930s
6%
1945–54
4.3%
1955–64
8.9%
1965–72
8%
1973–82
1.5%
1983–92
11%
1993–99
13%
2000–08
8.6%
2009–15
2.5%
2016–25
Ystrad MynachEngland & Wales
11% of homes are Victorian or older, against 16% across England and Wales. The busiest period since was 1900–18, which added 17% of today’s homes.
Valuation Office Agency, council tax stock of properties by build period, 31 March 2025, for the neighbourhoods (LSOAs) that make up the town, split by where their residents live. Homes with no recorded build period (0 here) are left out; 1939–44 is not a period in the data.
Neighbours
Listed buildings in the places around Ystrad Mynach
| Town | People | Listed | Grade I | History |
|---|---|---|---|---|
| Ystrad Mynach | 11,856 | 15 | 0 | B− |
| Maesycwmmer | 2,095 | 2 | 0 | C |
| Fleur-de-lis and Pengam | 3,102 | 1 | 0 | C |
| Tir-y-berth and Glan-y-nant | 1,411 | 2 | 0 | C+ |
| Pen-pedair-heol | 3,787 | 1 | 0 | D |
| Gelligaer | 1,436 | 4 | 0 | C |
| Blackwood | 12,621 | 6 | 0 | C |
| Pontllanfraith | 9,363 | 11 | 0 | C |
In brief
Ystrad Mynach in brief
More of Ystrad Mynach’s homes are old than in most places: 29% were built before 1919, against 15% in the typical UK town. In all there are 15 listed buildings, including Penallta Colliery Engine Hall and Fan House. Its older streets lie in 2 conservation areas, the first designated in 1993. The rest is about typical: like most towns its size, it has no Grade I building; and per resident it sits near the middle of UK towns.
Questions about Ystrad Mynach’s history
How many listed buildings are there in Ystrad Mynach?
Cadw lists 15 buildings inside Ystrad Mynach’s built-up area: 0 Grade I, 3 Grade II* and 12 Grade II.
How many conservation areas are there in Ystrad Mynach?
2, covering about 8 hectares of the town. The largest are Tredomen and Maesycwmmer/ Hengoed.
When were Ystrad Mynach’s buildings listed?
The first in 1985; the most, 7, in 1991.
How old are the homes in Ystrad Mynach?
29% of homes were built before 1919 and 37% before 1940, from the Valuation Office Agency’s council tax records (March 2025).
Listed buildings, scheduled monuments and historic parks and gardens: Cadw, © Crown copyright, via DataMapWales.
Sources: Cadw listed buildings, scheduled monuments and registered historic parks and gardens via DataMapWales, October 2026, inside the ONS 2022 built-up-area boundary · Valuation Office Agency, Council Tax: stock of properties by build period (31 March 2025) · TownRatings grades: our own summary of the data, ranked against UK towns only · Cadw conservation areas via DataMapWales (October 2026). All under the Open Government Licence v3.0.
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.