Spotted when a home's energy certificate shows at least 15 m² (and 15%) more floor area than an earlier one. Only homes with two certificates show up, so the real number is higher. A busy street suggests extensions get permission here; check the council's planning register for the details.
Storm overflows within 2 km
No monitored sewer storm overflows within 2 km (England only).
44 planned, approved or being built and 11 running (72 MW between them). Those within 5 km are on the map above.
Rooftop solar
Southampton General Hospital, Tremona Road - Solar PanelsApproved, not yet built · 250 kW
Feb 2024 1.7 km away
Rooftop solar
Spire Hospital, Chalybeate Close - Solar PanelsApproved, not yet built · 230 kW
May 2024 1.9 km away
Rooftop solar
Grosvenor House & Belmont House, Portswood Road - Solar PanelsApproved, not yet built · 160 kW
Apr 2025 1.9 km away
Rooftop solar
Airways Distribution Park, Wide Lane - Solar PanelsApproved, not yet built · 340 kW
Jun 2023 3.1 km away
Rooftop solar
Airways Distribution Park, Wide Lane, Unit 1 - Solar PanelsApproved, not yet built · 450 kW
Jan 2025 3.1 km away
Rooftop solar
Chandlers Ford - Solar panelsApproved, not yet built · 200 kW
Jun 2022 3.4 km away
Rooftop solar
Saxon House, Lower York Street - Solar Photovoltaic PanelsApproved, not yet built
May 2021 3.4 km away
Rooftop solar
Pei Genesis UK Limited, George Curl Way - Solar PanelsApproved, not yet built · 270 kW
Jan 2023 3.4 km away
Rooftop solar
Harbour Parade - Solar PhotovoltaicsApproved, not yet built
Jul 2025 3.8 km away
Rooftop solar
West Quay Retail Park, Harbour Parade - Solar PanelsApproved, not yet built
Dec 2025 3.8 km away
Road and street works within 1 km
13 permitted works running now or planned, 9 of them major.
Major
Bassett Gardens, SouthamptonUtility repair and maintenance works · SOUTHERN GAS NETWORKS PLC · Give and take
Oct 2026 to Oct 2026 100 m away
Major
Bassett Crescent West, SouthamptonUtility repair and maintenance works · SOUTHERN GAS NETWORKS PLC · Give and take
Sept 2026 to Nov 2026 100 m away
Major, planned
Bassett Crescent West, SouthamptonUtility repair and maintenance works · SOUTHERN GAS NETWORKS PLC · Give and take
Sept 2026 to Dec 2026 150 m away
Major
Bassett Crescent West, SouthamptonUtility repair and maintenance works · SOUTHERN GAS NETWORKS PLC · Give and take
Sept 2026 to Dec 2026 150 m away
Major, planned
Butterfield Road, SouthamptonHighway improvement works · SOUTHAMPTON CITY COUNCIL · Road closure
Oct 2026 to Dec 2026 200 m away
Major
Winchester Road, SouthamptonHighway improvement works · SOUTHAMPTON CITY COUNCIL · Road closure
Oct 2026 to Dec 2026 300 m away
Major
Redhill, SouthamptonHighway repair and maintenance works · SOUTHAMPTON CITY COUNCIL · Road closure
Oct 2026 to Oct 2026 350 m away
Major, planned
Bassett Crescent West, SouthamptonHighway improvement works · SOUTHAMPTON CITY COUNCIL · Road closure
Oct 2026 to Dec 2026 350 m away
Major
Glen Eyre Road, SouthamptonHighway improvement works · SOUTHAMPTON CITY COUNCIL · Road closure
Sept 2026 to Oct 2026750 m away
Major infrastructure projects within 30 km
Decided
M3 Junction 9 ImprovementHighways · Adjacent to Winnal industrial estate, Winchester, north of Alresford Road B3404
decided May 2024 17.0 km away
Pre-examination
Hampshire Water Transfer and Water Recycling ProjectDams and Reservoirs · The project is located in Hampshire, South East England, extending from Havant on the south coast, to Otterbourne near Winchester. The proposed Water Recycling Plant would be located off Harts Farm Way in Havant.
application due in May 2026 19.6 km away
Decision
AQUIND InterconnectorElectric Lines · From the UK seaward limit in the English Channel to Lovedean Substation.
application due Q4 2019 26.0 km away
Planning Inspectorate list of nationally significant infrastructure projects (roads, railways, energy, water, waste), October 2026 (OGL). Each is placed at one point, usually the middle of the site; long schemes run well beyond it.
Transport schemes within 20 km
None on our list yet. We're starting with recently opened and under-construction rail schemes.
The longer view
Like-for-like prices in Hollybrook: +17% over five years (2020 → 2025).
Council tax list: 0 homes added in the neighbourhood since April 2024.
Population (GP registrations): -1.0% in two years.
Asquith Nursery, David Lloyd Leisure - Solar PanelsApproved, not yet built · 300 kW
Jan 2024 3.8 km away
Rooftop solar
Buildings J K And Z Tesla Centre, Herbert Walker Avenue - Solar PanelsApproved, not yet built · 840 kW
Jan 2023 4.0 km away
Running nearest: Marchwood ERF (energy from waste, 5.5 km); Grove Solar Park (Phase 1) (solar farm, 5.7 km); Grove Solar Park (Phase 2) (solar farm, 5.7 km); Tavells Lane Solar Farm (solar farm, 6.0 km); Testwood Water Supply Works (solar farm, 6.3 km).
DESNZ Renewable Energy Planning Database, April to June 2026 (OGL). Projects of 150 kW and over; refused, withdrawn and abandoned ones are left out.
Standard
Bassett Crescent East, SouthamptonUtility asset works · SCOTTISH AND SOUTHERN POWER DISTRIBUTION (SSEPD) · Two-way signals
Dec 2026 to Dec 2026 300 m away
Minor
Bassett Meadow, SouthamptonUtility repair and maintenance works · SOUTHERN WATER · Some carriageway incursion
Oct 2026 to Oct 2026 100 m away
Minor
Bassett Avenue, SouthamptonHighway repair and maintenance works · SOUTHAMPTON CITY COUNCIL · Lane closure
Oct 2026 to Oct 2026 300 m away
DfT Street Manager permits (OGL), England. Dates are the planned ones; works often finish early or overrun.