- Cost: Timber cladding over timber frame is typically cheaper than brick cavity wall construction — £70–£150 per m² installed versus £120–£200 per m² for brick.
- Lifespan: Brick lasts 100+ years. Naturally durable timber cladding lasts 20–40 years before replacement — but individual boards are replaceable without disturbing the building.
- Maintenance: Brick is near-zero maintenance. Naturally durable timber cladding (larch, ThermoWood) is also near-zero. Treated softwood requires treatment every 2–3 years.
- Sustainability: Timber is significantly more sustainable — lower embodied carbon, renewable, carbon-storing, biodegradable at end of life.
- Speed: Timber frame with cladding is typically 30–40% faster to construct than brick.
- Planning: Brick is easier to match to existing buildings. Timber cladding is more widely accepted for contemporary additions and new builds.
Timber cladding versus brick is the most fundamental external material choice on UK new builds and house extensions — and one that is genuinely more nuanced than most online comparison guides suggest. Brick is not simply "traditional and expensive" and timber is not simply "modern and cheap." Both have real advantages and genuine limitations. The right choice depends on the project type, budget, planning context, sustainability targets, and how long the building will stand. This guide compares the two materials honestly across every dimension that matters for UK projects in 2026.
The Fundamental Difference — Structure vs Cladding
The most important thing to understand about comparing timber cladding and brick is that they are not always equivalent products. Brick can be structural — a load-bearing brick wall carries the building above it. Timber cladding is always non-structural — it is a rainscreen finish over a separate structural frame. When most people compare "timber cladding vs brick" for a house extension, they are actually comparing two different construction systems: a timber frame clad in timber boards versus a masonry cavity wall with brick outer leaf.
This distinction matters because the true cost and performance comparison must include the structural system, not just the exterior finish material. A timber frame with timber cladding competes against a masonry cavity wall — not just brick slips on a timber frame. The cost, speed, thermal performance, and structural behaviour of the whole wall system are the relevant comparators, not just the surface material alone.
Cost Comparison — Materials and Installation
| Construction system | Installed cost per m² | Speed | Notes |
|---|---|---|---|
| Brick cavity wall | £120–£200 | Slower | Includes blockwork inner leaf, cavity insulation, brick outer leaf, wall ties |
| Timber frame + larch cladding | £85–£150 | 30–40% faster | SIP or stud frame, insulation, breather membrane, battens, larch boards |
| Timber frame + ThermoWood | £95–£165 | 30–40% faster | As above with ThermoWood boards — higher material cost, zero maintenance |
| Timber frame + charred timber | £110–£185 | 30–40% faster | Premium finish — comparable to brick on installed cost, longer wow factor |
For most UK house extensions and new builds where a timber frame is appropriate, timber cladding over a timber frame is cheaper than brick cavity wall construction — typically by 15–30% on installed wall cost. The saving comes primarily from faster construction (lower labour hours) and a less materials-intensive structural system. For a full material cost breakdown see our timber cladding cost per m² guide.
Lifespan — Brick Wins, But the Gap Is Smaller Than You Think
| Material | Expected lifespan | Maintenance during lifespan | End of life |
|---|---|---|---|
| Brick (cavity wall) | 100+ years | Near zero — repointing every 50–75 years | Demolition waste — recyclable as aggregate |
| Siberian larch cladding | 20–35 years | Near zero — naturally durable | Biodegradable — repurposed or biomass |
| ThermoWood cladding | 25–40 years | Zero — no treatment ever | Biodegradable — repurposed or biomass |
| Nordic spruce cladding | 15–25 years (maintained) | Treatment every 2–3 years | Biodegradable |
Brick's 100+ year lifespan is a genuine and significant advantage for permanent buildings that will stand indefinitely. However, for most UK house extensions — where 30–50 years is a realistic planning horizon before the building is modified, extended again, or replaced — the lifespan advantage of brick over naturally durable timber cladding is less meaningful in practice. The more relevant question is whether the building will outlast the timber cladding's service life, and whether re-cladding at year 30–40 is an acceptable outcome for the project.
One significant advantage of timber cladding over brick on this point: individual boards can be replaced independently without disturbing the rest of the building. If a section of cladding is damaged, it is repaired at minimal cost. If a section of brick is damaged, repair is more complex and matching can be difficult with aged brickwork.
Maintenance — A More Even Contest Than Expected
Brick is often cited as "maintenance-free" compared to timber — but this is only true when compared to treated softwood. Naturally durable timber cladding in Siberian larch or ThermoWood has maintenance obligations that are comparable to brick — essentially zero during normal service life. The comparison that favours brick is against Nordic spruce or pine cladding that requires treatment every 2–3 years — and that is a fair point.
| Task | Brick | Larch / ThermoWood | Treated spruce |
|---|---|---|---|
| Annual inspection | Recommended | Recommended | Recommended |
| Periodic cleaning | Every 5–10 years | Every few years | Every 2–3 years |
| Repointing / resealing | Every 50–75 years | Not applicable | Not applicable |
| Preservative treatment | Never | Never (naturally durable) | Every 2–3 years |
| Board/element replacement | Difficult — matching old brick | Easy — individual boards | Easy — individual boards |
Sustainability — Timber Wins Decisively
On sustainability, timber cladding from sustainably managed forests has a decisive advantage over brick. Brick manufacturing is energy intensive — firing clay bricks at approximately 1,000°C produces significant CO2 emissions and the process cannot be decarbonised as readily as other building material production. Brick has an embodied carbon of approximately 0.24 kgCO2e per kg. FSC certified timber has a negative embodied carbon — it stores more carbon during growth than is emitted during production and transport.
For projects targeting net zero carbon, BREEAM credits, or low embodied carbon targets, a timber frame with natural timber cladding is significantly more sustainable than masonry construction. At end of life, timber cladding boards can be repurposed, composted, or used as biomass fuel — brick is demolition waste. Visit our sustainability page for full FSC and PEFC certification details. We supply Siberian larch, ThermoWood, Nordic spruce, and charred timber — all FSC and PEFC certified from sustainably managed sources.
Planning — When Each Material Has the Advantage
For planning purposes, brick has an advantage where the planning authority requires the extension to match existing brickwork — common in conservation areas, for listed buildings, and on estates where the local planning authority has strong material policies. In these contexts, timber cladding may be acceptable on a rear or side extension where it is not visible from the street, but not on the principal elevation.
For contemporary new builds, rear extensions, and additions to buildings where no specific material match is required, timber cladding is generally well-received by UK planning authorities — particularly in rural and semi-rural locations where natural materials are encouraged. Many local planning authorities actively prefer natural timber over render or composite materials for agricultural and rural residential buildings. See our planning permission for timber cladding guide for full detail.
Which Should You Choose?
- Timber frame construction is already specified
- Speed of construction is important
- Contemporary design is the intent
- Sustainability credentials are required
- Budget is a constraint — timber frame + cladding is typically cheaper
- The planning context permits contemporary materials
- 30–40 year service life is adequate for the project
- Planning requires matching existing brickwork
- 100+ year absolute lifespan is the requirement
- Masonry structural wall is required by the design
- The project is in a conservation area with brick requirements
- Traditional character is the design intent
- The client strongly prefers the permanence of masonry
For most contemporary UK house extensions and new builds where a timber frame is appropriate — timber cladding over a timber frame is the stronger choice on cost, speed, sustainability, and design flexibility. Brick retains a meaningful advantage for absolute longevity, planning compliance in sensitive locations, and projects where matching existing masonry is the brief. The two materials are not mutually exclusive — many of the most successful contemporary UK buildings combine brick structure with timber cladding on feature elevations. If you are unsure which is right for your project, our team can provide specification guidance and sample boards to support your planning and building control application. See also our self build cladding guide and our timber cladding building regulations guide.
Is timber cladding cheaper than brick in the UK?
Timber cladding over a timber frame (£85–£165 per m² installed) is typically cheaper than brick cavity wall construction (£120–£200 per m² installed). The saving comes from faster construction and a less materials-intensive structural system. The saving is 15–30% on typical UK extension projects.
Does brick or timber cladding last longer?
Brick lasts 100+ years. Naturally durable timber cladding in Siberian larch or ThermoWood lasts 20–40 years. For permanent buildings with indefinite planning horizons, brick's longevity is a real advantage. For most extensions with a 30–50 year planning horizon, naturally durable timber cladding covers the realistic service life comfortably.
Is timber cladding better than brick for a house extension?
For contemporary UK house extensions on timber frames, timber cladding is often better — cheaper, faster, more sustainable, and more design-flexible. Brick is better where matching existing brickwork is required by planning, where 100+ year lifespan is the requirement, or where a masonry structural wall is needed.
Which is more sustainable — timber cladding or brick?
Timber cladding from sustainably managed forests is significantly more sustainable than brick — lower embodied carbon, renewable, carbon-storing during growth, and biodegradable at end of life. Brick manufacturing is energy intensive and produces significant CO2. For net zero carbon and BREEAM targets, timber over timber frame is the stronger specification.
Do I need planning permission to use timber cladding instead of brick?
If approved drawings specify brick, submit a non-material amendment to change to timber cladding before ordering. In conservation areas and national parks, material changes require full planning consideration. In standard residential zones, timber cladding is generally well-received by planning authorities for contemporary additions.
Timber Cladding for UK Extensions & New Builds — Specification Support
We supply ThermoWood, Siberian larch, Nordic spruce, Douglas Fir, and charred timber cladding for UK new builds and extensions. FSC and PEFC certified. NBS product data and sample boards available for planning submissions. Nationwide delivery in 7–14 days.