Extension cost in Solihull (2026): local prices by postcode
Quick answerA 20m² single storey rear extension in Solihull typically costs £57,000 to £65,500 including VAT. Solihull is one of the dearest places in the West Midlands to extend, with Knowle, Dorridge and Hockley Heath at the very top, because homes are larger and owners usually choose higher spec finishes.
Typical prices in Solihull
Solihull B91, West Midlandsindex 1.06- Single storey rear extension20 m² (5m × 4m)£57,000 to £65,500£3,040/m²
- Kitchen extension with bifolds24 m² (6m × 4m), mid spec£76,000 to £87,000£3,360/m²
- Double storey rear extension40 m² over two floors£92,000 to £105,500£2,440/m²
- Dormer loft conversion2 bedrooms + en-suite£51,500 to £60,000
- Velux loft conversion2 rooms£37,000 to £43,000
- Garage conversion15 m² single garage£21,000 to £24,000£1,490/m²
All prices include 20% VAT, professional fees and statutory planning fees. Kitchen extension includes a mid-range kitchen, bifolds and a roof lantern.
Price my exact projectBuilding in Solihull
Solihull is largely suburban, with interwar and post-war semis in Shirley and Olton, large detached homes around the town centre, and the villages of Knowle, Dorridge and Hockley Heath surrounded by green belt. Big kitchen and family room extensions with wide glazing, double storey side extensions and loft conversions are the common projects. Many homes have space at the side and rear, so projects here are often larger than in the inner conurbation.
What moves the price in Solihull
Higher spec as standard
Solihull homeowners often choose aluminium bifolds or sliders, roof lanterns, underfloor heating and quality kitchens. Those choices add up quickly, so a like-for-like comparison with Birmingham is not just about day rates.
Green belt villages
Knowle, Dorridge, Hockley Heath and much of rural Solihull are washed over by or surrounded by green belt. Extensions that are large compared with the original house may struggle in planning, so the design needs to be proportionate.
Busy builders
Demand from the area's larger homes keeps good builders booked well ahead. Expect to wait for a start date, and get quotes early if you have a deadline.
Planning in Solihull
Planning and building control here are handled by Solihull Metropolitan Borough Council. Many single storey rear extensions and loft conversions in England fall under permitted development, but conservation areas and Article 4 directions remove some of those rights, so check with the council before you commit to drawings.
Prices by postcode district in Solihull
A 20m² single storey rear extension and a two-bedroom dormer loft with an en-suite, priced for each district. All figures include VAT and fees.
| Postcode | Area | Single storey, 20m² | Dormer loft | Index |
|---|---|---|---|---|
| B90 | Shirley | £55,500 to £64,000 | £50,000 to £58,500 | 1.03 |
| B91 | Solihull | £57,000 to £65,500 | £51,500 to £60,000 | 1.06 |
| B92 | Olton | £56,000 to £64,500 | £50,500 to £59,000 | 1.04 |
| B93 | Knowle and Dorridge | £58,000 to £67,000 | £52,000 to £61,000 | 1.08 |
| B94 | Hockley Heath | £58,000 to £67,000 | £52,000 to £61,000 | 1.08 |
Solihull: common questions
How much does an extension cost in Solihull?
A 20m² single storey rear extension in Solihull typically costs £57,000 to £65,500 including VAT, about £3,040 per square metre. A mid-spec 24m² kitchen extension with bifolds and a lantern is around £76,000 to £87,000.
Do I need planning permission for an extension in Solihull?
Single storey rear extensions within the permitted development limits often don't, but green belt, conservation areas and estate conditions can change that. Solihull Metropolitan Borough Council can confirm, or you can apply for a lawful development certificate.
How much is a double storey extension in Solihull?
A double storey rear extension with 40m² over two floors typically costs £92,000 to £105,500 including VAT in Solihull. Side double storey extensions on semis are also common and usually need planning permission.
Why is Solihull more expensive than Birmingham?
Day rates are similar, but Solihull projects tend to be larger and higher spec, and builders price to the local market. That is why our index adds a premium for B91, B93 and B94.