Looking to maximise the space in your home while adding value? Boarding your loft is the perfect solution. By converting your dusty and unused loft into a functional and accessible area, you can fully utilise every square inch of space. Whether it's for storing seasonal items, creating a cosy reading nook or even having an extra bedroom, boarding your loft offers endless possibilities.
Not only does boarding a loft enhance your living experience, but it also adds value to your home. With soaring house prices, utilising your loft by creating usable space benefits you personally and increases the market value should you decide to sell in the future. It's a cost-effective way to boost both functionality and value.
Quick Answers: Loft Boarding FAQs
How do you board a loft?
To board a loft, first install loft legs to raise the floor above existing insulation (typically around 270mm). Lay chipboard or OSB boards perpendicular to the joists and secure them to the loft legs with screws. Leave expansion gaps between boards to allow for movement.
How to lay loft boards?
Install loft legs at regular centres along each joist. Lay boards perpendicular to the joists and secure them with screws into each support point. Continue laying boards across the loft, leaving expansion gaps between boards.
Can you board a loft without loft legs?
Yes, but only if insulation depth is minimal. Boarding directly onto joists compresses insulation and reduces its thermal effectiveness. Loft legs help preserve insulation performance.
How to board a loft with insulation?
Install loft legs tall enough to accommodate your insulation depth. Lay insulation between joists, then attach loft boards on top of the legs to create a raised storage floor.
How much does it cost to board a loft?
DIY loft boarding typically costs between £400 and £800 for materials. Professional installation generally costs £800 to £1,500 depending on the loft size and materials used.
Why Board Your Loft?
Create Valuable Storage Space
The average UK home loft offers 30–50m² of storage space that often goes unused. Boarding your loft transforms this wasted space into practical storage for seasonal items, suitcases and household equipment.
Add Property Value
A boarded loft can add £1,000–£3,000 to a property's value because buyers appreciate additional storage space and the potential for future loft conversion.
Improve Energy Efficiency
Boarding your loft allows you to upgrade insulation to modern standards. Proper insulation helps reduce heat loss through the roof and can lower heating bills significantly.
Enable Future Loft Conversion
A boarded loft is often the first step toward converting the space into a bedroom, office or living area in the future.
Before You Start: Is Your Loft Suitable for Boarding?
Joist Strength and Spacing
Most modern homes have joists capable of supporting light storage loads once boarded. Older properties may require inspection before boarding.
Headroom and Access
Adequate headroom and a practical loft hatch or ladder make accessing a boarded loft much easier and safer.
Roof Condition
Check for leaks, damp or structural issues before installing loft boards. Fix any roof problems first.
Services and Cables
Ensure electrical cables are safely clipped above boarding level and that water tanks or services remain accessible.
Building Regulations
Simple loft boarding for storage usually does not require Building Regulations approval. However, converting the loft into a habitable room will require approval.
Materials and Tools You'll Need
Loft Boarding Materials
Loft Legs
- Plastic supports that raise the boarding above insulation
- Available in various heights depending on insulation depth
- Usually 6–8 legs required per square metre
Loft Boards
- 18mm or 22mm chipboard tongue-and-groove boards
- OSB boards
- Purpose-made loft boards for easier handling
Fixings and Accessories
- Screws for loft legs
- Chipboard board screws
- Joist tape to protect cables
Tools Required
- Electric drill or driver
- Jigsaw or handsaw
- Tape measure
- Pencil and straight edge
- Spirit level
- Safety equipment such as gloves and dust mask
Step-by-Step: How to Board a Loft
Step 1: Measure and Plan
Measure your loft area and calculate the number of boards and loft legs needed. Create a simple plan showing joist direction and obstacles.
Step 2: Clear the Loft Space
Remove stored items and clean the area to create a safe working environment.
Step 3: Protect Cables and Services
Ensure cables are clipped above the boarding level and clearly marked for future access.
Step 4: Install Loft Insulation
Upgrade insulation to the recommended depth of approximately 270mm before installing boards.
Step 5: Install Loft Legs
Attach loft legs to the joists at regular intervals to create a raised framework above the insulation.
Step 6: Lay the Loft Boards
Lay boards perpendicular to the joists and screw them into the loft legs, leaving expansion gaps between boards.
Step 7: Cut Boards for Obstacles
Measure carefully around water tanks, pipes and structural elements before cutting boards.
Step 8: Create Access Panels
Leave removable boards above services that may require future maintenance.
Step 9: Final Checks
Walk across the floor, tighten screws if necessary and ensure access to important services remains clear.
Boarding a Loft Without Loft Legs
You can board directly onto joists without loft legs, but this approach has significant limitations.
When direct boarding works:
- You have no insulation (though this means poor energy efficiency)
- Your insulation is very thin (less than 100mm)
- You're willing to sacrifice insulation effectiveness
- The loft is in an unheated building (garage or shed)
Why direct boarding is problematic:
Compressing insulation dramatically reduces its effectiveness. Insulation works by trapping air. Compressed insulation contains less air and provides much less thermal resistance. Boarding directly onto joists with 270mm insulation beneath can compress it to 50–100mm, losing most of its insulating value.
If you must board directly:
- Lay boards perpendicular to the joists
- Secure each board to every joist it crosses
- Leave 10mm expansion gaps
- Accept that thermal performance will be reduced
A better solution is to use loft legs or raise the floor level with additional timber framework.
Loft Boarding Over Existing Insulation
If you have existing insulation and want to add boarding, loft legs are essential.
- Check insulation depth: Measure your current insulation.
- Top up if needed: If insulation is less than 270mm, add more before boarding.
- Select the correct loft leg height: Choose legs tall enough to sit above the insulation depth.
- Install as normal: Follow the standard loft leg and boarding process.
This maintains insulation effectiveness while providing a usable storage floor.
Common Loft Boarding Mistakes to Avoid
Compressing Insulation
The most common mistake is boarding directly onto joists and compressing the insulation beneath. This destroys the insulation’s effectiveness. Always use loft legs to raise boards above insulation.
Inadequate Expansion Gaps
Chipboard expands when it absorbs moisture from the air. Without expansion gaps boards may buckle. Leave approximately 10mm gaps between boards and walls.
Blocking Ventilation
Lofts require ventilation to prevent condensation. Do not block eaves vents or soffit ventilation when installing loft boards.
Ignoring Cables
Electrical cables should not be buried beneath boards. Ensure cables are clipped above the boarding level or safely secured along joists.
Overloading Weak Joists
Not all loft joists are designed for heavy loads. If storing heavy items, check joist strength or consult a structural engineer.
Poor Access Planning
A boarded loft is far more useful with proper access. Ensure your loft hatch is large enough and consider installing a loft ladder.
How Much Weight Can a Boarded Loft Hold?
Standard loft joists in modern UK homes are designed for light storage when properly boarded.
Typical safe loading:
- Light storage (boxes, suitcases): 25–50 kg/m²
- General storage: up to 100 kg/m²
- Heavy storage: requires structural assessment
If you plan heavy storage or a loft conversion, consult a structural engineer to assess joist capacity and recommend reinforcement if required.
Final Thoughts
Boarding your loft is one of the easiest ways to create valuable storage space and improve your home's efficiency. By installing loft legs and maintaining proper insulation depth, you can create a safe and practical storage area without compromising energy performance.
With the right planning, materials and installation approach, most homeowners can successfully board their loft and unlock unused space in their home.
