Two-storey extensions in Boston
Homeowners in Boston can use us for the whole project or just the drawings and approvals. Start with a free visit.
Boston at a glance
- Postcode districts
- PE20, PE21 and PE22
- Area
- Lincolnshire, England
- Price region
- East Midlands
- Nearest towns
- Spalding (14.1 miles), Sleaford (16 miles), Skegness (19 miles), Bourne (20.8 miles)
- Distance to Lincoln
- about 27.4 miles
- Approvals
- Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission.
We cover postcode districts PE20, PE21 and PE22 in and around Boston, along with neighbouring Spalding, Sleaford and Skegness.
Extensions available in Boston
Two-storey rear extensions
Our East Midlands guide starts at £55,000 for this type.
Learn more
Two-storey side extensions
Guide from £84,500 in Boston, including VAT.
Learn more
Two-storey wraparound extensions
For homes in Boston: typical guide from £118,000.
Learn more
Part single, part two-storey extensions
Boston guide price from £70,500, Standard spec.
Learn more
Extensions over a garage
For homes in Boston: typical guide from £31,000.
Learn more
First-floor extensions
Design, approvals and build for Boston homes. Guide from £24,500.
Learn more
Two-storey extensions for semi-detached houses
Our East Midlands guide starts at £55,000 for this type.
Learn more
Two-storey extensions for detached houses
Guide from £84,500 in Boston, including VAT.
Learn more
Kitchen extensions with bedrooms above
Boston guide price from £55,000 (before kitchen units), Standard spec.
Learn more
Extra bedroom and en-suite extensions
Our East Midlands guide starts at £55,000 (plus en-suite) for this type.
Learn moreWhich type suits your house?
Which type suits your house in Boston depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
Also available in Lincolnshire
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Party wall notices for extensions
- Design and build two-storey extensions
Rules for Boston
Boston is in England. Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission. Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
The full England rules explained
Questions about extensions in Boston
Do you cover Boston?
Yes. We cover Boston (PE20, PE21 and PE22) and the surrounding area, including Spalding and Sleaford. The first site visit is free.
What does a two-storey extension cost in Boston?
Using our East Midlands guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £55,000–£74,000 including VAT. An extension over a garage is about £31,000–£45,000.
Which other places near Boston do you cover?
Everywhere around it, including Spalding (14.1 miles), Sleaford (16 miles) and Skegness (19 miles), and the rest of Lincolnshire.