When planning a new build, extension, garage, or garden room, one of the first decisions you’ll face is the construction method. Two of the most popular options for residential buildings in the UK are oak frame and timber frame — and while they may sound similar, they’re fundamentally different in terms of materials, aesthetics, cost, and longevity.
In this guide, we’ll break down exactly how oak frame and timber frame construction compare, so you can make an informed decision for your project.
What Is Oak Frame Construction?
Oak frame construction uses large sections of solid green oak (freshly cut, unseasoned English or European oak) to create the structural skeleton of a building. The frame is assembled using traditional mortise and tenon joinery — joints that are cut by hand or with precision machinery and secured with oak pegs rather than metal fixings.
This method has been used in Britain for over a thousand years. Many medieval halls, barns, and churches that still stand today are testament to the extraordinary durability of oak framing.
At Sussex Oak Structures, we combine these traditional techniques with modern technology, using CAD design and CNC-assisted cutting alongside hand craftsmanship to create precise, beautiful oak frames.
Key Characteristics of Oak Frame
- Material: Solid green oak — typically 150mm x 150mm to 250mm x 300mm sections
- Joinery: Traditional mortise and tenon, pegged joints
- Aesthetic: Exposed beams visible internally — the frame IS the feature
- Insulation: Typically enclosed with SIPs panels (such as Kingspan TEK) or infill panels
- Lifespan: 500+ years
What Is Timber Frame Construction?
Timber frame construction (sometimes called stick-build or platform frame) uses smaller sections of kiln-dried softwood — typically spruce or pine — to create a structural frame. The frame is assembled using metal brackets, nails, and screws, and is then wrapped in sheathing board and insulation.
This is the dominant construction method for new-build housing in Scotland and is increasingly common across the rest of the UK. It’s an efficient, well-proven system that offers good thermal performance and fast build times.
Key Characteristics of Timber Frame
- Material: Kiln-dried softwood — typically 38mm x 89mm to 38mm x 140mm sections
- Joinery: Metal brackets, nails, screws
- Aesthetic: Frame is hidden behind plasterboard — looks like any conventional build
- Insulation: Insulation fitted between and around the frame studs
- Lifespan: 60-100 years with proper maintenance
Head-to-Head Comparison
| Factor | Oak Frame | Timber Frame |
|---|---|---|
| Material | Solid green oak | Kiln-dried softwood |
| Cost (per m²) | £1,800 – £3,000+ | £1,200 – £2,000 |
| Aesthetic | Exposed beams, characterful | Hidden frame, conventional |
| Lifespan | 500+ years | 60-100 years |
| Thermal Performance | Excellent (with SIPs/TEK) | Very good |
| Build Speed | Moderate (frame raising 1-3 days) | Fast (panels erected in days) |
| Design Flexibility | Very high — bespoke designs standard | High — but standardised panels common |
| Sustainability | Very high — low processing, long life | Good — renewable material |
| Property Value | Significant premium | Moderate impact |
| Maintenance | Minimal — oak hardens over time | Moderate — protection from moisture critical |
Cost Comparison: Oak Frame vs Timber Frame
Oak frame construction is typically 20-40% more expensive than standard timber frame when comparing like-for-like building sizes. For a rough comparison:
- A timber frame garage might cost £8,000 – £15,000 for a two-bay structure
- An oak framed garage of equivalent size would be £18,000 – £35,000
- A timber frame house might cost £1,200 – £2,000 per m² for the shell
- An oak framed house would be £1,800 – £3,000+ per m²
The premium reflects the higher material cost of oak, the skilled craftsmanship required, and the bespoke nature of most oak frame projects.
Durability and Longevity
This is where oak frame construction is in a league of its own. Green oak actually gets stronger as it seasons (dries out) in situ. The natural tannins in oak make it highly resistant to fungal decay and insect attack. The large section sizes mean that even if the surface weathers, the structural integrity remains unaffected for centuries.
Softwood timber frames, while perfectly adequate for modern building standards, are far more susceptible to moisture damage, fungal decay, and insect attack if the protective envelope is compromised. They rely on preservative treatments and careful moisture management throughout their life.
There are oak framed barn houses and hall houses in Sussex and Surrey that are 500+ years old and still structurally sound. You won’t find a softwood timber frame building from that era.
Aesthetics and Character
For many people, this is the deciding factor. An oak framed building has an aesthetic quality that no other construction method can replicate:
- Exposed beams, posts, and braces create warmth, character, and a connection to traditional architecture
- The natural grain, colour variation, and gentle movement of green oak as it seasons gives each building a unique personality
- Oak frames complement both contemporary designs and traditional cottages
- The frame becomes the interior design feature — no need for additional finishing to create impact
Timber frame construction, by contrast, produces a building that looks and feels like any conventional brick or rendered property from the outside and inside. The frame is entirely hidden.
Thermal Performance and Energy Efficiency
Both construction methods can achieve excellent thermal performance, though they approach it differently.
Oak frames are typically enclosed with Kingspan TEK panels (Structural Insulated Panels) which provide outstanding insulation with minimal thickness. This combination of oak frame and SIPs delivers U-values that comfortably exceed current Building Regulations requirements.
Timber frames achieve their insulation through mineral wool, PIR boards, or similar insulation fitted between and around the softwood studs. Performance is very good and well-suited to meeting modern energy standards.
Which Is Right for Your Project?
Choose Oak Frame If:
- You want exposed beams and traditional character
- Longevity and heritage are important to you
- You’re building a feature structure — garage, garden room, extension, or house
- You want to maximise property value
- You appreciate traditional craftsmanship and bespoke design
- You’re building in a rural or period-property setting
Choose Timber Frame If:
- Budget is the primary consideration
- You want the fastest possible build time
- The frame’s appearance doesn’t matter (it will be hidden)
- You’re building a standard new-build housing development
- You need a highly standardised, repeatable construction system
Can You Combine Both Methods?
Absolutely. Many of our projects at Sussex Oak Structures combine an oak frame for the main living areas or feature rooms with timber frame for utility areas, bedrooms, or ancillary spaces. This gives you the best of both worlds — the character of exposed oak where it matters most, with the cost efficiency of timber frame elsewhere.
Get Expert Advice
If you’re weighing up oak frame vs timber frame for your next project, we’re happy to talk through the options. Our team has decades of experience in oak frame design and can help you find the right approach for your budget, site, and vision.
Contact Sussex Oak Structures or call us on 01293 851287 for a no-obligation conversation.
Frequently Asked Questions
Is oak frame more expensive than timber frame?
Yes, oak frame construction typically costs 20-40% more than softwood timber frame. However, oak frames have a significantly longer lifespan, require less maintenance, and add more value to a property. Many homeowners find the premium justifiable given the aesthetic and longevity advantages.
How long does an oak frame last compared to timber frame?
Oak framed buildings can last 500+ years — many medieval oak framed structures in the UK are still standing today. Standard softwood timber frames have an expected lifespan of 60-100 years with proper maintenance, though they may require more repair work over time.
Can you see the frame in an oak framed building?
Yes, one of the key aesthetic advantages of oak framing is that the structural beams, posts, and braces are left exposed internally, creating the characteristic warm, characterful look. Softwood timber frames are typically hidden behind plasterboard and are never seen.
Which is better for extensions — oak frame or timber frame?
Both work well for extensions, but oak frame extensions offer a distinctive architectural character that timber frame cannot match. Oak framed extensions are particularly popular for garden rooms, orangeries, and kitchen-dining extensions where the exposed beams become a design feature.
