Summary - The Roundhouse, Park Lane, Old Knebworth SG3 6PP
5 bed 5 bath Detached
Extensive sustainably designed living — solar, battery, biomass and rainwater collection
Almost 5,000 sq ft: five bedrooms, flexible lower-level entertaining spaces
Secluded countryside setting with gated drive and several off-street parking spaces
Principal suite with natural clay-plaster ensuite and private garden access
Operable largely off-grid; clear-water septic tank in place
Main heating uses wood logs — substantial log store and workshop provided
Slow broadband despite being wired for high-speed internet
Council Tax Band H — very expensive, plus bespoke maintenance needs
Sited in open countryside near Knebworth, The Roundhouse is an exceptional five-bedroom detached home offering almost 5,000 sq ft of striking, sustainably minded living. Its circular plan and dramatic central core create generous, light-filled spaces over three levels, with a top-floor open-plan reception and extensive glazing providing panoramic treetop views. Handcrafted local materials and reclaimed finishes give the house strong character while underfloor heating, solar, battery storage and a biomass boiler significantly reduce conventional energy reliance.
The accommodation suits a family seeking privacy and flexible living: five bedrooms, a large principal suite with natural-clay-plaster ensuite, playroom, mezzanine study and a lower level arranged for entertainment, gym/studio and utility. Outside, landscaped gardens, terraced seating and a wide balcony extend living outdoors; a gated drive provides generous off-street parking and a log store and workshop support the wood-fuelled heating system.
Practicalities are equally important: the property can operate largely off-grid with rainwater collection, rooftop solar and a clear-water septic system. Note the home is designed to use solid fuel (wood logs) alongside the boiler and electric range, so ongoing fuel storage and handling are part of the running costs. Broadband is reported as slow despite wiring for high-speed connection.
Considerations: council tax is very expensive (Band H), and the home’s unusual form and specialist materials mean maintenance may be more bespoke and costlier than a conventional house. The main entrance sits on the first floor with an external staircase, which may affect accessibility for some buyers. Overall, The Roundhouse will appeal to buyers who value architectural individuality, sustainability and rural seclusion within commuting reach of London.
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