William Street - NP12 1NU
Key Postcode Insights
NP12 1NU is a residential postcode situated on William Street, Hollybush, Blackwood, NP12 with 30 addresses.
It ranks as the 1067th largest and 809th most expensive of the 1,371 postcodes in the NP12 area. The most common property type is a period house built between 1800 and 1911.
The postcode contains a total of 30 properties: 29 houses and 1 flat.
- Ave. Sale Price
- £216,782
- 10 Year change
- up 72.6%
- Ave. Rental Price
- £1,093pcm
- 10 Year change
- up 68.3%
- Ave. £ per ft²
- £178/ft²
- Ave. Gross Yield
- 6.1%/year/yr
Key Postcode Insights
NP12 1NU is a residential postcode situated on William Street, Hollybush, Blackwood, NP12 with 30 addresses.
It ranks as the 1067th largest and 809th most expensive of the 1,371 postcodes in the NP12 area. The most common property type is a period house built between 1800 and 1911.
The postcode contains a total of 30 properties: 29 houses and 1 flat.
- Ave. Sale Price
- £216,782
- 10 Year change
- up 72.6%
- Ave. Rental Price
- £1,093pcm
- 10 Year change
- up 68.3%
- Ave. £ per ft²
- £178/ft²
- Ave. Gross Yield
- 6.1%/year/yr
Explore Propertiesin NP12 1NU
- The Old Court
Building  |  2 Flats
- 48 William Street
Unknown
- 50 William Street
3 Bed Period House
- 52 William Street
3 Bed Period House
- 54 William Street
3 Bed Period House
Sales Market Trends
The last sale in NP12 1NU sold for £185,000 on 19th December 2025. Since then prices are up an average of 3.6%.
The current average value in the postcode is £216,782.
The NP12 1NU Sales Market has increased by 72.6% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| June 2026 | 2.9% | £216,782 |
| June 2025 | 2.5% | £210,732 |
| June 2024 | 0.4% | £205,540 |
| June 2023 | 4.4% | £204,774 |
| June 2022 | 15.8% | £196,108 |
| June 2021 | 10% | £169,383 |
| June 2020 | 4.3% | £153,968 |
| June 2019 | 8.8% | £147,573 |
| June 2018 | 5% | £135,676 |
| June 2017 | 2.9% | £129,258 |
| June 2016 | 0.6% | £125,600 |
| June 2015 | 2.4% | £124,813 |
| June 2014 | 6.6% | £121,927 |
| June 2013 | -3.2% | £114,373 |
| June 2012 | -0.4% | £118,143 |
| June 2011 | -1.7% | £118,631 |
| June 2010 | 1.4% | £120,706 |
| June 2009 | -14.1% | £119,070 |
| June 2008 | 2.2% | £138,646 |
| June 2007 | 0% | £135,624 |
Rental Market Trends
The current average rental value in the postcode is £1,093.
The NP12 1NU Rental Market has increased by 68.3% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| June 2026 | 1.6% | £1,093pcm |
| June 2025 | 4.3% | £1,076pcm |
| June 2024 | 5.8% | £1,032pcm |
| June 2023 | 6.7% | £975pcm |
| June 2022 | 13.3% | £914pcm |
| June 2021 | 9.3% | £807pcm |
| June 2020 | 4.7% | £738pcm |
| June 2019 | 2.7% | £705pcm |
| June 2018 | 2.3% | £687pcm |
| June 2017 | 3.4% | £671pcm |
| June 2016 | 3.1% | £649pcm |
| June 2015 | 0.4% | £630pcm |
| June 2014 | 2% | £627pcm |
| June 2013 | -1.4% | £615pcm |
| June 2012 | -0.9% | £624pcm |
| June 2011 | 2.6% | £629pcm |
| June 2010 | 3.4% | £614pcm |
| June 2009 | -3.6% | £594pcm |
| June 2008 | 0.3% | £616pcm |
| June 2007 | 0% | £614pcm |
Sales History
The last sale was on 19th December 2025 for £185,000 and since then the market in the area has increased by 3.6%. The postcode has had a total of 39 sales since 1995.
NP12 1NU has seen 7 sales in the last three years and 4 sales in the last twelve months.
- Sold Dec 2025£185,000 | 3 Bed House69, William Street, Blackwood, NP12 1NU69, William Street, Blackwood, NP12 1NU
- Sold Dec 2025£165,000 | 3 Bed House61, William Street, Blackwood, NP12 1NU61, William Street, Blackwood, NP12 1NU
- Sold Sep 2025£187,500 | 3 Bed House65, William Street, Blackwood, NP12 1NU65, William Street, Blackwood, NP12 1NU
- Sold Aug 2025£335,000 | 5 Bed Flat2 The Old Court, William Street, Blackwood, NP12 1NU2 The Old Court, William Street, Blackwood, NP12 1NU
- Sold Apr 2025£187,500 | 3 Bed House82, William Street, Blackwood, NP12 1NU82, William Street, Blackwood, NP12 1NU
Nearby Postcodes
NP12 1NU is the 1067th largest and the 809th most expensive postcode out of the 1,371 postcodes in the NP12 area.
- NP12 1NY, Hall Street, Blackwood, NP12NP12 1NY28 Addresses|75 m away
- NP12 1AB, High Street, Fleur De Lis, Blackwood, NP12NP12 1AB8 Addresses|94 m away
- NP12 1NW, William Street, Hollybush, Blackwood, NP12NP12 1NW27 Addresses|94 m away
- NP12 1NR, Hall Street, Blackwood, NP12NP12 1NR3 Addresses|113 m away
- NP12 1AF, High Street, Fleur De Lis, Blackwood, NP12NP12 1AF7 Addresses|115 m away
Property Types
- 20 period houses built between 1800 and 1911
- 2 modern houses built after 1980
- 8 other addresses of unknown type
- period house (20)
- modern house (2)
- Unknown (8)
Energy Efficiency
- Energy Performance Certificate (EPC) surveys conducted for 22 properties.
- The most common rating is D.
- A (0)
- E (5)
- B (1)
- F (0)
- C (6)
- G (0)
- D (10)
- No EPC (8)
Top 3 Most Expensive Sales
- Sold Aug 2025£335,000 | 5 Bed Flat2 The Old Court, William Street, Blackwood, NP12 1NU2 The Old Court, William Street, Blackwood, NP12 1NU
- Sold Jun 2025£188,000 | 4 Bed House46, William Street, Blackwood, NP12 1NW46, William Street, Blackwood, NP12 1NW
- Sold Apr 2025£187,500 | 3 Bed House82, William Street, Blackwood, NP12 1NU82, William Street, Blackwood, NP12 1NU
Schools Nearby
Public Transport Nearby
The closest station to NP12 1NU is Pengam station, which is 2.5 kilometres away.
- Pengam|2.5 km away
- Gilfach Fargoed|3.0 km away
- Hengoed|3.0 km away
- Newbridge|3.6 km away
