Hampshire · South East
Home Extension Costs in Portsmouth
Portsmouth's island geography and dense Victorian housing make home extensions a popular way to add space. Costs are above the national average, typical for the South East, with loft conversions being especially popular.
Extension Types Available in Portsmouth
Single Storey Extension
A single storey rear or side extension is one of the most popular home improvements in the UK, adding valuable living space without the complexity of multi-level construction.
Estimated cost in Portsmouth
£32,200 – £50,600
Typical 20m² project
Double Storey Extension
A double storey extension adds significant space on two levels, making it cost-effective per square metre compared to two separate single storey extensions.
Estimated cost in Portsmouth
£55,200 – £87,400
Typical 40m² project
Loft Conversion
A loft conversion transforms unused attic space into a habitable room, offering one of the best returns on investment of any home improvement project.
Estimated cost in Portsmouth
£31,625 – £50,313
Typical 25m² project
Kitchen Extension
A kitchen extension creates a modern, open-plan living and dining space, typically extending the rear of the property to accommodate a larger kitchen area.
Estimated cost in Portsmouth
£32,085 – £51,750
Typical 18m² project
Garage Conversion
A garage conversion transforms an existing garage into a habitable room, offering one of the most affordable ways to add living space without building an extension.
Estimated cost in Portsmouth
£11,213 – £21,563
Typical 15m² project