- Upfront cost: Broadly comparable — both typically £80–£150 per m² fully installed depending on specification.
- Maintenance: Render requires repainting every 8–15 years and crack repairs. Naturally durable timber cladding requires little to no maintenance.
- Lifespan: Siberian larch and ThermoWood last 20–40 years with minimal maintenance. Render lasts 20–30 years before full replacement.
- Appearance: Timber offers warmth, natural texture and variation. Render offers clean, crisp lines and a more uniform finish.
- Sustainability: Timber is carbon-storing and renewable. Render has a higher embodied carbon footprint.
- Best for timber: Contemporary extensions, garden rooms, new builds, and projects where natural warmth and low maintenance are priorities.
Timber cladding versus render is one of the most common material decisions on UK house extensions and new builds — and one where the right answer genuinely depends on the project. Both are legitimate, well-proven exterior finishes. Both have significant advantages and real limitations. This guide compares them honestly across every dimension that matters — upfront cost, whole-life cost, maintenance, lifespan, appearance, sustainability, and planning — so you can make the right choice for your specific building rather than following fashion.
Cost Comparison — Upfront and Whole-Life
| Cost element | Timber cladding (larch) | Silicone render | Monocouche render |
|---|---|---|---|
| Materials per m² | £35–£70 | £15–£30 | £25–£45 |
| Battens/substrate per m² | £10–£15 | £5–£15 (beads, mesh) | £5–£15 |
| Installation labour per m² | £25–£45 | £30–£50 | £35–£55 |
| Total installed per m² | £70–£130 | £50–£95 | £65–£115 |
| Repainting / maintenance (30 yrs) | £0–£15 (optional oiling) | £30–£60 (2–3 repaint cycles) | £30–£60 |
| 30-yr whole-life cost per m² | £70–£145 | £80–£155 | £95–£175 |
On a straightforward upfront cost comparison, silicone render is cheaper than timber cladding. However, the whole-life cost gap is much smaller — and favours timber when naturally durable species are specified. The cost of render repainting (scaffolding, labour, paint) every 8–15 years adds up substantially over a 30-year period. Naturally durable timber in Siberian larch or ThermoWood requires no repainting — ever. For a full timber cladding cost breakdown see our timber cladding cost per m² guide.
Maintenance — The Biggest Practical Difference
| Task | Timber (larch / ThermoWood) | Render |
|---|---|---|
| Annual wash-down | Optional — every few years | Recommended — algae and staining |
| Repainting | Never (naturally durable species) | Every 8–15 years — mandatory |
| Crack repair | Not applicable | As needed — particularly at junctions |
| Board replacement | Individual boards replaceable | Patch repairs visible — full render strip often needed |
| Fixing inspection | Every 10 years recommended | Not applicable |
| Scaffolding required for maintenance | Rarely | Yes — for repainting above ground floor |
Maintenance is where naturally durable timber cladding has its clearest advantage over render. Render's repainting cycle is not optional — without it, render becomes stained, cracked, and visually tired within 10–15 years. Each repaint cycle requires scaffolding on buildings above single storey — typically £1,500–£3,500 per scaffold — making even a single repaint cycle a significant expense. Naturally durable timber such as larch and ThermoWood simply does not have this obligation.
Lifespan — Which Lasts Longer?
| Material | Expected service life | Notes |
|---|---|---|
| Siberian larch cladding | 20–35 years | No treatment required — naturally durable |
| ThermoWood cladding | 25–40 years | BRE endorsed 30-year service life — zero maintenance |
| Silicone render | 20–30 years | Requires repainting every 8–15 years during service life |
| Monocouche render | 20–30 years | Through-colour — no repainting but does stain and crack |
| K-render / acrylic render | 15–25 years | Lower-cost render — stains quickly in UK conditions |
Appearance — Natural Warmth vs Clean Geometry
Appearance is the most subjective dimension of this comparison — and where genuine personal preference should drive the decision rather than performance data. The two materials produce fundamentally different visual outcomes that suit different architectural intentions.
- Natural warmth — wood grain, colour variation
- Texture and shadow depth from profiles
- Changes character with weathering — living material
- Wide range of tones — from pale spruce to deep charred black
- Suits contemporary and rural architectural styles
- Each installation is unique — no two buildings identical
- Clean, crisp, smooth surface
- Uniform colour across the elevation
- Wide colour palette — virtually any RAL colour
- Suits minimalist and contemporary styles
- Works well alongside glazing and steel
- More neutral — easier to change colour later
Sustainability — Timber Wins Clearly
Timber cladding from sustainably managed forests is one of the most sustainable exterior building materials available — it is carbon-storing, renewable, biodegradable at end of life, and requires minimal energy to produce compared to cement-based products. FSC and PEFC certified timber from Scandinavian sources — the origin of our Siberian larch and ThermoWood — comes from forests that are independently certified as sustainably managed.
Render is cement-based — its production is energy intensive and has a significantly higher embodied carbon than timber. Acrylic and silicone renders contain synthetic polymers derived from petrochemical sources. At end of life, render is demolition waste — it cannot be recycled and goes to landfill. Timber cladding boards can be repurposed, composted, or used as biomass fuel.
For projects with BREEAM, Passivhaus, or other sustainability credentials to achieve, timber cladding is the stronger specification choice. For architects targeting net zero carbon buildings, the embodied carbon of the external envelope — including cladding material — is an increasingly important calculation. See our sustainability page for full certification details. We also supply Nordic spruce and charred timber for projects where budget or aesthetic requirements differ. Our full cladding range includes profiles from shiplap to triple shadow gap in all naturally durable species.
Planning Permission — Does Material Choice Matter?
For most house extensions and new builds, both timber cladding and render are acceptable external materials and planning permission will be granted for either. The material decision becomes more significant in sensitive locations — conservation areas, national parks, Areas of Outstanding Natural Beauty, and listed building settings — where planning authorities may have specific preferences or policies. In these contexts, traditional render may be preferred for older building types while timber cladding is generally well-received for contemporary insertions and new builds. Always check with your local planning authority at pre-application stage before committing to either material. For full guidance see our planning permission for timber cladding guide and our timber cladding building regulations guide.
Which Should You Choose?
For contemporary UK extensions and new builds where whole-life cost, sustainability, and low maintenance are priorities — naturally durable timber cladding in Siberian larch or ThermoWood is the stronger choice over render. For projects where a clean, smooth, uniform finish is the design intent and upfront cost is the primary driver — silicone render may be the appropriate choice. The two materials are not mutually exclusive — a combination of timber cladding on feature elevations and render on secondary elevations is increasingly popular and produces a strong architectural result at a controlled overall cost.
Is timber cladding cheaper than render in the UK?
Silicone render is cheaper upfront (£50–£95 per m² installed vs £70–£130 for timber) but the whole-life cost gap is much smaller. Render requires repainting every 8–15 years plus scaffolding costs. Naturally durable timber cladding in larch or ThermoWood requires no repainting — making it comparable or cheaper over 30 years.
Which lasts longer — timber cladding or render?
ThermoWood lasts 25–40 years with zero maintenance. Siberian larch lasts 20–35 years. Modern silicone render lasts 20–30 years before full replacement but requires repainting every 8–15 years during that period. On a 30-year whole-life basis, naturally durable timber cladding is generally cheaper and requires less intervention.
Does timber cladding or render need more maintenance?
Render requires significantly more active maintenance — washing every 2–3 years, repainting every 8–15 years, and crack repair as needed. Naturally durable timber cladding in Siberian larch or ThermoWood requires no preservative treatment and minimal maintenance throughout its service life.
Does timber cladding add more value than render?
Both add value when well specified and installed. Timber cladding tends to be more positively received in planning and adds distinctive architectural character. Render is more neutral and widely accepted. The best choice for value addition depends on property type, location, and local market.
Is it easier to get planning permission for timber cladding or render?
In most UK locations both are acceptable and planning is granted for either. In conservation areas and national parks, planning authorities may have preferences for specific materials. Always check with your local planning authority at pre-application stage before committing to either material.
Timber Cladding — All Species from UK Stock
We supply Siberian larch, ThermoWood, Nordic spruce, Douglas Fir, and charred timber cladding from UK stock. FSC and PEFC certified. Nationwide delivery in 7–14 days. Contact our team to discuss your project and get a precise material quantity and price.