Worthing, West Sussex
Two-storey rear extension in Worthing
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. If you live in Worthing and want to know what a two-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Worthing is covered from our West Sussex round, including BN11, BN12, BN13 and BN14. Two-storey rear extensions suit semi-detached houses in Worthing best, where the extra bedroom matters as much as the bigger kitchen.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a two-storey rear extension cost in Worthing?
Guide prices for a two-storey rear extension in Worthing start from our South East England rate of £2,020–£3,020 per square metre, including VAT. South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £60,500–£90,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £97,000–£145,000 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a two-storey rear extension in Worthing?
The planning route for a two-storey rear extension in Worthing is set by England's householder rules and your council.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Worthing like to extend?
Around Worthing the housing ranges from inter-war semis to 1960s and 1970s estates with good-sized gardens. Many of the newer estates had permitted development rights removed by condition, so we check the planning history before anything is drawn.
How a two-storey rear extension in Worthing comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Two-storey rear extensions near Worthing
From Worthing, the nearest places we also cover are Lancing (2.4 miles) and Shoreham-by-Sea (4.6 miles).
- Two-storey rear extension in Lancing
- Two-storey rear extension in Shoreham-by-Sea
- Two-storey rear extension in Rustington
- Two-storey rear extension in Portslade
- Two-storey rear extension in Littlehampton
Other work in Worthing:
FAQ
Two-storey rear extension questions in Worthing
Do I need planning permission for a rear extension in Worthing?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
How much does a two-storey rear extension cost in Worthing?
As a guide, £2,020–£3,020 per square metre including VAT for a standard specification. For example, 3 m × 5 m footprint, two floors (30 m²): about £60,500–£90,500 at that rate. Your written price follows the survey.
Will we need to move out?
Rarely. The first-floor opening is made late in the job and sealed with temporary screens.
Can you match the brick or stone on my Worthing house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
What postcode areas do you cover around Worthing?
Including BN11, BN12, BN13 and BN14, and the surrounding West Sussex area.