Extension cost per m² in Glasgow
Extension cost by size in Glasgow
Each row multiplies the current £1,800–£3,000 per m² national benchmark by floor area and then applies the same Scotland factor.
What can change a real Glasgow quote?
- Floor area and number of storeys
- London and regional labour rates
- Steelwork and structural changes
- Kitchen or bathroom installation
- Glazing and door specification
- Finish level, access and contingency
Local planning considerations
Scottish projects can have different regulatory and grant contexts, so check current official rules alongside the cost estimate where relevant.
- Scottish building standards and scheme rules should be checked separately from any England-and-Wales guidance linked elsewhere on the site.
- Tenement or managed-flat work can add common-property, access and approval considerations beyond the physical installation cost.
- Traditional masonry and older fabric may need specialist repair specifications that are not represented by a simple regional multiplier.
How the regional model works
The 0.95× factor places this planning estimate 5% below the national planning baseline. We keep that modelling assumption separate from the dated national benchmark so users can see exactly which part comes from an external source and which part is UK Home Costs modelling.
Sources
House Extension: Cost Breakdown 2026
Published / checked: June 2026
Used for: Extension cost-per-m² benchmarks and common add-on costs
Construction output price indices
Published / checked: 13 August 2026
Used for: Construction price trend and update checks
Frequently asked questions
How much does a house extension cost in Glasgow in 2026?
Our modelled Glasgow planning rate is about £1,700–£2,850 / m², based on the current national £1,800–£3,000 per m² benchmark and the Scotland regional factor. This is not an observed city-wide quote average.
How much is a 20m² extension in Glasgow?
Applying the same regional model to the current national benchmark gives about £34,200–£57,000 before VAT for a straight-line 20m² example. Structural work, glazing, kitchens, bathrooms and access can move a real quote outside that range.
Why is the Glasgow estimate different from the UK benchmark?
UK Home Costs applies a 0.95× Scotland planning factor, which places the model 5% below the national planning baseline. The factor is our modelling assumption rather than an external city price index.
Does the extension figure include VAT and professional fees?
The national benchmark used here is stated before VAT. Do not assume architect, structural engineer, planning, building-control, party-wall or specialist survey fees are included unless a contractor quote says so explicitly.