Composite Decking & Balustrade Installation in Gloucester, Cheltenham & Stroud
- Daniel Halik
- Jul 10
- 8 min read
Updated: 5 days ago
A completed composite decking and balustrade installation, creating a modern outdoor living space that's built to last.
Over the last few years, we have seen more homeowners choosing composite decking instead of traditional timber.
The reason is simple. People want an outdoor space they can enjoy without spending every spring sanding, staining and repairing old wooden boards.
Composite decking offers a modern, durable and low-maintenance alternative. It can be used for simple garden seating areas, raised terraces, sloping gardens and more complex installations over patios or flat roofs.
At Danew Construction Ltd
, we install composite decking and balustrade systems across Gloucester, Cheltenham, Stroud and the surrounding areas. Every project is planned around the property, the ground conditions and the way the client wants to use the space.
Why Are Homeowners Choosing Composite Decking?
Traditional timber decking can look excellent when it is first installed, but it normally requires regular maintenance. Without cleaning, treatment and staining, timber boards can fade, split, become slippery or begin to rot.
Composite decking is designed to reduce many of these problems.
The main benefits include:
No regular painting or staining
Better resistance to moisture, rot and insects
A wide choice of colours and wood-effect finishes
Hidden fixing systems for a cleaner appearance
Less ongoing maintenance than traditional timber
A long expected service life when installed correctly
Composite decking still needs occasional cleaning, particularly in shaded areas where dirt or organic growth may collect. However, it usually requires much less attention than a traditional timber deck.
How Much Does Composite Decking Cost in Gloucestershire?
How Much Does Composite Decking Cost in Gloucestershire?
The cost of composite decking depends on much more than the price of the boards.
The final quotation will be affected by the size of the area, site access, ground conditions, drainage, the height of the deck, the type of supporting frame and whether balustrades, steps or gates are required.
As a general guide:
Standard ground-level composite decking may start from around £120–£180 per m²
Raised decking and more complex structures may cost around £180–£300+ per m²
Composite balustrades may cost approximately £120–£220 per linear metre
Glass balustrade systems may cost approximately £250–£450 per linear metre
These figures are only rough estimates. A small but complicated raised terrace can cost more per square metre than a larger, straightforward ground-level deck.
Removal of old decking, repairs to the existing surface, waterproofing, restricted access and additional structural work can also increase the final cost.
For an accurate quotation, the area should always be inspected and measured properly before work begins.
The original timber decking had deteriorated over time, making it the perfect opportunity to create a safer, stronger and more attractive outdoor space.
Different Composite Decking Installation Methods
Not every deck should be installed in the same way. The correct method depends on the surface below, the required finished height and how water will drain underneath the structure.
Treated Timber Subframe
A treated timber frame is commonly used for domestic garden decking. It provides a strong and practical supporting structure when it is correctly designed, fixed and protected from standing water.
The joist spacing must follow the decking manufacturer’s requirements. Composite boards usually need closer support than traditional timber boards because excessive spacing can allow them to flex.
Aluminium Subframe
Aluminium systems are often selected for premium installations or areas where resistance to moisture is particularly important.
They normally cost more than timber, but they offer excellent stability, do not rot and can provide a long-lasting base for the decking.
Adjustable Pedestal System
Adjustable pedestals are useful for terraces, balconies, rooftops, flat roofs and uneven hard surfaces.
The pedestals support the frame without requiring it to sit directly on the surface below. Their height can be adjusted individually, allowing the installer to create a level deck above a sloping or uneven base.
A pedestal system can also:
Maintain drainage beneath the deck
Reduce direct contact with the waterproof surface
Allow airflow under the structure
Create space for cables, pipes or other services
Make future access beneath the deck easier
The important point is that the supporting system must distribute weight safely without damaging the surface below.
Adjustable pedestal supports provide a perfectly level subframe while protecting the waterproof surface below and allowing effective drainage.
From Our Experience
Over the years, we've found that one of the biggest mistakes homeowners make is focusing only on the decking boards.
While choosing the right colour and finish is important, it's actually the structure underneath that determines how well your decking performs over the next 20 years.
A properly designed subframe, effective drainage, correct joist spacing and careful installation all play a vital role in the long-term performance of any composite decking system.
In many cases, these hidden details make the difference between a deck that lasts for decades and one that starts developing problems after only a few years.
Can Composite Decking Be Installed Over a Flat Roof?
Yes, composite decking can be installed over a flat roof, but the project needs careful planning.
The decking must not prevent rainwater from reaching the outlets, and the frame must not damage the waterproof membrane. There should also be enough space underneath for ventilation and future inspection.
Before installing decking over a flat roof, the waterproofing should be checked carefully. Installing an expensive new deck over a damaged or incomplete roof covering can create serious problems later.
On suitable projects, adjustable pedestals can support the frame while keeping it raised above the waterproof surface. This allows water to continue flowing underneath the structure.
The load of the finished decking, frame, balustrades, furniture and people must also be considered. Complex or heavily loaded structures may require advice from a structural professional.
Every board is carefully installed using hidden fixing clips to achieve clean lines, consistent spacing and a professional finish.
Why Hidden Fixings Matter
Most modern composite decking systems use concealed clips between the boards rather than visible screws through the surface.
This creates a cleaner finish and helps maintain consistent spacing between each board.
The gaps are important because they allow:
Water to drain from the surface
Air to circulate
The boards to expand and contract
Dirt to be washed or brushed away
Composite boards naturally move slightly as temperatures change. The installer must therefore follow the manufacturer’s instructions for board spacing, fixing points and expansion gaps around walls, posts and other fixed objects.
Common Problems We Find on Decking Projects
Decking work can sometimes reveal issues that were not visible before the old boards were removed.
Common problems include:
Rotten or Weak Existing Frames
Old boards may hide a frame that has already started to rot. Reusing a weak structure can shorten the life of the new decking and create a safety risk.
Poor Drainage
Water should never be allowed to sit around timber joists or collect underneath the deck. The finished structure must allow rainwater to drain away naturally.
Uneven or Soft Ground
Soft soil may require proper foundations, concrete pads, ground screws or another suitable support system. Simply placing a frame directly onto unstable soil is unlikely to provide a lasting result.
Incorrect Joist Spacing
Composite decking requires the correct level of support. If joists are spaced too far apart, boards can flex or feel unstable.
Restricted Access
Narrow side passages, steep gardens and properties without direct rear access can affect labour time, waste removal and material delivery.
Insufficient Expansion Gaps
Boards installed too tightly can move, lift or place pressure on surrounding structures when temperatures change.
Good preparation is just as important as the visible finish. A deck may look perfect on the first day, but the quality of the frame and drainage will determine how well it performs in the years ahead.
Installing the balustrade system is one of the final stages, adding both safety and a contemporary finishing touch to the decking.
Choosing the Right Balustrade
Balustrades provide safety around raised decking, steps and changes in level, but they also have a major effect on the finished appearance.
Common options include:
Composite Balustrades
Composite balustrades match the decking well and require less maintenance than traditional painted timber. They are available in a range of colours and styles.
Aluminium Balustrades
Aluminium systems create a clean, modern appearance and are resistant to rot and moisture.
Glass Balustrades
Glass is often chosen where homeowners want to keep an open view across the garden. It can create a premium finish, although it normally costs more and requires more regular cleaning.
The balustrade posts must be fixed into a suitable supporting structure. They should never rely only on the surface decking boards for strength.
Gates, steps and access routes should also be planned at the beginning of the project rather than added as an afterthought.
Attention to detail during installation helps ensure the decking not only looks great but also performs reliably for many years to come.
How Long Does Composite Decking Installation Take?
A straightforward domestic decking project may take approximately three to seven working days.
Larger raised decks, projects with extensive balustrades or installations over flat roofs can take longer.
The programme may include:
Removing the existing decking
Checking the surface and drainage
Completing repairs or waterproofing work
Installing foundations, pedestals or supports
Building the subframe
Installing the composite boards
Fitting steps, balustrades and gates
Completing final checks and cleaning the area
Weather, access and hidden structural problems can affect the schedule.
The finished composite decking transformed this outdoor space into a practical, low-maintenance area that can be enjoyed throughout every season.
This project demonstrates how careful planning, quality materials and professional installation can completely transform an outdoor space while keeping future maintenance to a minimum.
Frequently Asked Questions
Is composite decking slippery?
Good-quality composite decking usually has a textured surface designed to provide grip. However, like any outdoor surface, it can become slippery when covered with algae, leaves, ice or dirt. Regular cleaning is still important.
Does composite decking fade?
Some colour change can occur after installation, particularly during the first few months. The amount depends on the product and manufacturer. Higher-quality capped boards generally offer better resistance to fading and staining.
Can composite decking be installed over concrete?
Yes, provided the concrete base is stable and there is enough height for a suitable frame or support system. Drainage must not be blocked.
Can composite decking be installed on a sloping garden?
Yes. Sloping gardens can often be improved with a raised frame, creating a level and more usable outdoor area. The supporting structure and foundations must be designed for the height and ground conditions.
Can composite decking be pressure washed?
Some products can be cleaned using a pressure washer on a low setting, but the manufacturer’s instructions should always be followed. Excessive pressure or holding the nozzle too close can damage the surface.
How long does composite decking last?
The expected lifespan depends on the product, installation quality and supporting structure. Many manufacturers provide warranties in the region of 20–25 years, although warranty terms vary.
Is composite decking maintenance-free?
No outdoor surface is completely maintenance-free. Composite decking still needs occasional washing and removal of leaves, dirt and organic growth. However, it normally requires far less maintenance than timber decking.
Do I need planning permission?
Many domestic decking projects can be completed without a full planning application, but this depends on the height, location, property and local restrictions. Raised platforms, listed buildings and properties in conservation areas may need additional checks. Planning requirements should be confirmed before work begins.
Final Thoughts
A well-designed composite decking area can completely change the way a garden or terrace is used.
The boards and balustrades are the parts everyone sees, but the long-term performance depends on what is underneath them. Proper foundations, drainage, ventilation, joist spacing and fixing details all matter.
Whether you are replacing an ageing timber deck, creating a new seating area or planning a raised terrace over a flat roof, choosing the right installation method from the beginning can prevent costly problems later.
Danew Construction provides composite decking and balustrade installation across Gloucester, Cheltenham, Stroud and the surrounding areas.
If you are considering a new decking project, we would be happy to visit the property, discuss the available options and prepare a detailed quotation based on the layout and site conditions.
Thinking About Composite Decking?
Whether you're planning a new garden deck, replacing old timber decking or installing a modern composite balustrade system, we'd be happy to help.
Every project starts with a conversation and honest advice.
About the Author
Daniel Halik
Director | Danew Construction Ltd
With years of practical experience in residential construction and property renovations, Daniel shares expert advice based on real projects completed across Gloucestershire. His goal is to help homeowners make informed decisions before starting their next building project.
Continue Reading
Looking for more home improvement advice?
Explore our latest articles covering property renovations, bathroom installations, home extensions, decorating projects and practical building advice for homeowners across Gloucestershire.
Comments