DIY frame garage made of wood for 2 cars: from foundation to roof

Why a wooden frame garage is the optimal solution for two cars

Building a garage for two cars often becomes a headache: concrete structures require a lot of time and budget, metal structures freeze in winter and heat up in summer. A wooden frame garage solves these problems by combining speed of construction, environmental friendliness and the possibility of year-round use. With the right approach, such a garage will last 20+ years, and its construction will cost 2-3 times less than its brick counterpart.

The main advantage of frame technology is no “wet” processes. You don't have to wait a month for the foundation to harden or hire a crane to install reinforced concrete slabs. All structural elements are assembled like a construction set, and modern wood impregnations (for example, "Senezh Ultra" or "Pinotex") protect it from rotting, fire and insects. In addition, the wooden frame is easy insulate and sheathed with any facade material - from vinyl siding to a log block house.

In this article we will look at a unique layout for assembling a 6x9 m garage with a reinforced frame for two cars (including crossovers or SUVs), which can withstand snow loads of up to 300 kg/m² and wind gusts of up to 25 m/s. All calculations are given for the climatic zones of Russia, Ukraine and Belarus, taking into account standards SP 20.13330.2016.

Project preparation: dimensions, drawings and standards

Before purchasing materials, you need to decide garage dimensions and draw up a working drawing. Standard dimensions for two machines:

• 📏 Length: 8–9 m (for comfortable opening of doors and passage between cars)
• 📏 Width: 6–7 m (minimum 3 m per vehicle + 1 m per aisle)
• 📏 Height: 3–3.5 m (consider the height of the gate + 30 cm for ventilation)

For a 6x9 m garage you will need strip or pile-grillage foundation (depth of occurrence - below the freezing level of the soil). If the soil in the area is heaving, use screw piles with a diameter of 108 mm in increments of 1.5–2 m. For stable soils, a monolithic tape 30 cm wide is suitable.

Please note fire safety standards:

• 🔥 Distance to the neighboring house - at least 6 m (if the garage walls are not fire-resistant)
• 🔥 Inside the garage is required fire partition between cars (can be made of plasterboard GKLO)
• 🔥 Electrical wiring only in corrugated or metal hose, sockets are waterproof (IP54)

⚠️ Attention: If the garage is adjacent to the house, there should be separate wall made of non-combustible materials (brick, aerated concrete) with a thickness of at least 25 cm. In this case, the wooden frame elements are processed fire bioprotection in 2 layers.

Materials and tools: complete list with prices (2026)

To build a 6x9 m garage, you will need the following materials (calculation for frame + sheathing + roof):

Material	Quantity	Approximate price (RUB)	Notes
Beam 150×150 mm (foundation)	0.5 m³	12 000–15 000	For the bottom trim
Board 50×150 mm (wall frame)	3 m³	45 000–55 000	Pitch of racks - 60 cm
OSB-3 (cladding)	25 sheets 1250×2500 mm	30 000–38 000	Thickness 12–18 mm
Insulation (basalt wool)	15 m³	25 000–35 000	Rockwool Light Butts or equivalent
Metal tiles	60 m²	24 000–40 000	Color of your choice, with anti-condensation film

The tools you will definitely need are:

• 🔨 Circular saw (for cutting timber and OSB)
• 🔩 Screwdriver (with an attachment for self-tapping screws 50–70 mm)
• 📐 Laser level (to level the frame)
• 🛠️ Construction stapler (for attaching vapor barrier)

Step-by-step instructions: from foundation to roof

Construction begins with marking the site and preparing the foundation. Let's look at the process using an example strip foundation (the most reliable option for a frame garage).

1. Foundation: strip or pile?

If the soil on the site clayey or loamy, a strip foundation with a depth of 50–70 cm is optimal. Work order:

1. We dig a trench 30 cm wide around the perimeter of the garage + under the internal walls (if any).
2. Laying it down geotextiles and fill it with a sand cushion (15–20 cm) and tamp it down.
3. We install formwork from boards or plywood, install a reinforcement cage (rods ∅12 mm, cell 20×20 cm).
4. Pouring concrete M250–M300 in layers of 20 cm, vibrating each layer.

For peat or marshy soils better to choose screw piles. They are screwed in to a depth of 1.5–2 m in increments of 1.5 m, then tied with a channel or timber 150×150 mm.

2. Assembling the wall frame

After the foundation has hardened (7–10 days), we proceed to the frame:

We assemble the frame according to the diagram:

1. Laying it down bottom trim made of timber 150×150 mm, fastened to the foundation with anchor bolts.
2. Install vertical racks from a 50x150 mm board in 60 cm increments. We fix it with temporary jibs.
3. We mount top harness and check the geometry using a level and tape measure.
4. Strengthening the frame constant jibs (from the same board 50x150 mm) for rigidity.

For a two car garage necessarily strengthen the central part of the frame with additional racks - this will prevent the roof from sagging under the snow. Use metal perforated corners for fastening - they are more reliable than nails.

3. Roof: single-pitch or gable?

For a garage 6x9 m is optimal pitched roof with a slope of 10–15° (enough for snow removal, but easier to install). If you want an attic for storage, choose a gable roof with a slope of 30–45°.

Procedure for installing a pitched roof:

1. Laying it down rafters from a board 50×150 mm in increments of 60 cm, fastened to the top trim.
2. Laying waterproofing membrane (for example, "Tyvek") overlap 10–15 cm.
3. We mount sheathing from a board 25x100 mm (the pitch depends on the roof: for metal tiles - 35 cm).
4. We lay the roofing material, starting from the bottom row.

⚠️ Attention: If more than 1.5 m of snow falls in your region in winter, strengthen the rafter system double rafters or reduce the pitch to 40 cm. Otherwise, the roof may sag.

Insulation and interior decoration: how to make a garage warm

An uninsulated wooden garage freezes in winter, which leads to condensation on cars and corrosion. To avoid this, use three-layer insulation system:

1. Vapor barrier (from inside) - "Izospan B" or similar.
2. Insulation - basalt wool "Rockwool" or "TechnoNIKOL" thickness 100–150 mm.
3. Waterproofing (outside) - "Tyvek" or "Yutavek".

Work order:

1. Secure the vapor barrier to the frame with a stapler and glue the joints butyl rubber tape.
2. Place the insulation spaced between the frame posts (no gaps!).
3. Cover the insulation with waterproofing and secure it with 20x40 mm slats.
4. Cover the walls from the inside OSB or clapboard, outside - siding or professional sheet.

For floor use expanded clay + screed (if the foundation is strip) or insulated slab (if piled). Optimal thickness of the floor pie:

• 🏗️ Compacted soil — 10 cm
• 🏗️ Sand — 5 cm
• 🏗️ Expanded clay — 15 cm
• 🏗️ Screed with reinforcement — 8–10 cm

Gates and ventilation: key nuances

Ideal for a two-car garage sliding or sectional gates 5–6 m wide. Swing gates take up a lot of space when opened and are less reliable. When choosing, consider:

• 🚪 Sliding gates - save space, but require guides and a counterweight.
• 🚪 Sectional doors - sealed, but more expensive and more difficult to install.
• 🚪 Rolling gates — compact, but not suitable for regions with frosts below –20°C.

For ventilation, be sure to provide:

• 💨 Inlet openings - at the bottom of gates or walls (closed with bars).
• 💨 Exhaust pipe - with a diameter of 100–150 mm, extending 50 cm above the roof ridge.
• 💨 Forced ventilation (optional) — duct fan capacity 100–150 m³/h.

⚠️ Attention: If in the garage there will be inspection hole, its walls need to be waterproofed bitumen mastic and insulate expanded polystyrene 50 mm thick. Otherwise, the pit will become damp and moldy.

Electrical wiring and lighting: safety rules

Electricity in a wooden garage requires special attention. Use only hidden wiring in metal pipes or corrugation. Optimal scheme:

• ⚡ Input cable — VVGng-LS 3×6 mm² (from a house or pole).
• ⚡ Distribution panel — with RCD 30 mA and automatic switches.
• ⚡ Sockets - waterproof (IP54), height 1.2 m from the floor.
• ⚡ Lighting — LED panels or explosion-proof lamps (Ex).

Best used for lighting 12 volt systems with a step-down transformer - they are safer in conditions of high humidity. Position the lamps so that they illuminate:

• 💡 The area in front of the cars (for inspection)
• 💡 Workbench (if available)
• 💡 Gate (for night opening)

What to do if the electricity goes out in the garage?

Check the machines in the panel (the RCD may have tripped). If they are not the problem, inspect the cable for damage. A temporary solution is to carry it away from home with a 2.5 mm² cable (maximum 3.5 kW load).

How much does it cost to build a frame garage for 2 cars?

The final cost depends on the selected materials and region. Approximate calculation for a 6x9 m garage (self-assembly):

Stage of work	Cost (RUB)	Deadlines (days)
Foundation (strip)	80 000–120 000	5–7
Frame + roof	150 000–200 000	10–14
Insulation + sheathing	90 000–130 000	7–10
Gate + ventilation	60 000–100 000	3–5
Electrical wiring	20 000–40 000	2–3

Total: RUB 350,000–500,000 (excluding tools). If you hire a crew, the cost will increase by 40–60%. Savings are achieved through:

• 💰 Purchasing materials in bulk (discounts up to 15%).
• 💰 Self-assembly (especially frame and trim).
• 💰 Use of used materials (for example, metal tiles from disassembly).

FAQ: answers to frequently asked questions

Do I need to obtain permission to build a frame garage?

If the garage not adjacent to the house and its area is less than 50 m², no permit is required (according to Art. 51 Civil Code of the Russian Federation). However, if the garage is part of a permanent structure (for example, attached to a house), notification of the start of construction is required.

What insulation is best for a wooden garage?

Optimal choice - basalt wool (Rockwool, TechnoNIKOL) or ecowool. They do not burn, do not rot and retain heat well. Polystyrene foam is cheaper, but it cannot be used without additional protection from rodents (they chew through it within a season).

Is it possible to build a garage without a foundation?

Technically yes, but only if:

1. Soil sandy or gravel (not heaving).
2. Garage in use seasonally (not for year-round car storage).
3. The frame is reinforced diagonal connections and anchors to the ground.

In other cases, a foundation is required - otherwise the garage will warp in 2-3 years.

How to protect a wooden garage from rodents?

Rodents damage insulation and wires. Effective measures:

• 🐭 Process the bottom trim bitumen mastic (mice don't gnaw it).
• 🐭 Lay around the perimeter metal mesh with a cell of 5 mm.
• 🐭 Use ultrasonic repellers (for example, "Tornado OZV.01").

How long does construction take?

When working independently and in good weather:

• 📅 Foundation — 5–7 days (including concrete hardening).
• 📅 Frame + roof — 10–14 days.
• 📅 Insulation + finishing — 7–10 days.

Total: 3–4 weeks (excluding downtime due to rain).