House with 15m underground tunnels for sale for 300k
A Reading, UK bungalow has gone up for auction with an extensive hand-dug tunnel network and underground rooms reaching 15 meters below ground, initially causing confusion over whether the listing meant meters, miles, or “15M” tunnels. Commenters weigh the appeal of such whimsical, hobbyist engineering against worries about safety, structural integrity, radon, planning permission, and mortgageability, which likely contribute to the relatively low £300k guide price. The thread branches into broader examples of hobby tunneling, underground expansions in cities, and how unconventional features can both enhance a home’s character and turn it into a financial or legal liability.
Measurement confusion & tunnel extent
- Many initially misread “15m” as 15 million or 15 miles of tunnels; clarified as 15 meters depth.
- The network is about 1,300 sq ft underground, across multiple levels, not a single 15 m–long corridor.
- Some note UK-typical mixing of metric (depth) and imperial (area), which added to confusion.
Property, price & market context
- A detached bungalow with a pool and large workshop/tunnel complex starting at £300k in Reading is seen as unusually cheap.
- Several point out it’s an auction guide price; expectation is it will sell significantly higher.
- Comparisons to other listings suggest a discount likely tied to complexity, risk, and financing difficulty.
- It’s unclear whether what’s for sale is a full house plus tunnels, or mainly outbuildings/land with planning permission for a new house.
Permissions, liability & financing
- Concern that many tunnels may be unpermitted, making mortgages hard or impossible; banks avoid properties with adverse surveys or unresolved legal questions.
- Discussion of UK planning rules: older unchallenged works can sometimes be “regularised,” but authorities can also demand remediation or infill.
- Even with permissions, owners shoulder structural, flooding, and subsidence risks; uniqueness is seen as both a selling point and a liability.
Geology, safety & health
- Local ground reported as sand/gravel over chalk, with a deep water table; chalk can be stable but not everyone would trust unshored ceilings.
- Comparisons to London basements on clay, where over-digging has caused collapses.
- Radon risk in the area is debated: not a hotspot like granite regions, but some argue testing and ventilation are still prudent for deep basements.
Whimsy vs practicality
- Many are charmed by the eccentric hobby-tunneling and secret entrances (e.g. rocket by the pool).
- Others find the spaces creepy or “dungeon-like” and doubt their usability versus a conventional basement or garage.
- Broader debate emerges: homes as personal playgrounds versus financial assets constrained by resale value and regulatory scrutiny.