Two-storey extensions in Grimsby
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Grimsby.
Grimsby at a glance
- Postcode districts
- DN31, DN32, DN33, DN34 and DN37
- Area
- Lincolnshire, England
- Price region
- East Midlands
- Nearest towns
- Cleethorpes (1.8 miles), Immingham (6.7 miles), Hedon (13 miles), Louth (14 miles)
- Distance to Lincoln
- about 30.2 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 DN31, DN32, DN33, DN34 and DN37 in and around Grimsby, along with neighbouring Cleethorpes, Immingham and Hedon.
Extensions available in Grimsby
Two-storey rear extensions
Our East Midlands guide starts at £55,000 for this type.
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Two-storey side extensions
From £84,500 in Grimsby. Free visit to firm it up.
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Two-storey wraparound extensions
Guide from £118,000 in Grimsby, including VAT.
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Part single, part two-storey extensions
Grimsby guide price from £70,500, Standard spec.
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Extensions over a garage
From £31,000 in Grimsby. Free visit to firm it up.
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First-floor extensions
Design, approvals and build for Grimsby homes. Guide from £24,500.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Grimsby homes. Guide from £55,000.
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Two-storey extensions for detached houses
For homes in Grimsby: typical guide from £84,500.
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Kitchen extensions with bedrooms above
Design, approvals and build for Grimsby homes. Guide from £55,000 (before kitchen units).
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Extra bedroom and en-suite extensions
For homes in Grimsby: typical guide from £55,000 (plus en-suite).
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Grimsby we measure distances to every boundary before suggesting a type.
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 Grimsby
Grimsby 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 Grimsby
Do you cover Grimsby?
Yes. We cover Grimsby (DN31, DN32, DN33, DN34 and DN37) and the surrounding area, including Cleethorpes and Immingham. The first site visit is free.
What does a two-storey extension cost in Grimsby?
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 Grimsby do you cover?
Everywhere around it, including Cleethorpes (1.8 miles), Immingham (6.7 miles) and Hedon (13 miles), and the rest of Lincolnshire.