Decking & Outdoor Structures · Liverpool & Merseyside

Decking, Pergolas & Garden RoomsBuilt to Last in the British Climate,Across Liverpool & Merseyside

Hardwood and composite decks, pergolas, carports and timber garden rooms — built on engineered sub-frames that don't sink, warp or rot. Designed to look intentional for 20+ years.

Sub-frame in pressure-treated C24 — guaranteed 15 years.

16 yrs joinery experienceFireQual certifiedFully insured (£5m PL)Companies House #15212735Surveys booked in 5–7 days
Service Overview

Decking & Outdoor Structures — what's actually involved

What it is

Outdoor structures are the timber framing, decking and joinery work that transforms a garden — raised and ground-level decks, pergolas, carports, garden offices and storage, planters, screens and gates. Built on engineered foundations (concrete pads, ground screws or paving slabs) with pressure-treated sub-frames and decking boards in composite, softwood or hardwood.

Who it's for

Homeowners turning a patchy back garden into a usable entertaining space, landlords adding value to outdoor space at re-let, hospitality clients building decking for pubs and outdoor dining, and anyone who wants more use of their garden across more months of the year.

When you need it

Spring through autumn is the obvious build window, but pressure-treated structures can be installed year-round in Merseyside's climate. The best time to build a deck is the spring before the summer you want to use it — book 8–12 weeks ahead.

Why professional matters

Most decks fail at the sub-frame, not the boards. Posts set in soil rot in 3–5 years; joists without adequate ventilation underneath rot in 8; decking boards laid without a 3mm expansion gap cup and split. Done properly — concrete-set posts or ground screws, ventilated sub-frame, correct fastener spec — a deck or pergola lasts 20+ years.

What happens if it's ignored

The cost of leaving it — or getting it wrong

Posts set in soil that rot in 5 years

The classic shortcut. Posts must be concrete-set or fixed to galvanised post saddles above ground, never buried in soil. Almost every failing deck we replace failed here.

Sub-frames trapped against damp ground

Without 100–150mm of clear ventilation under the joists, the sub-frame stays damp and rots. We always raise off ground level with pads or screws and leave clear air space.

Boards laid butt-tight and then cupping

Timber expands across the grain when wet. Boards laid with no expansion gap warp upward and split. We lay with 3–5mm gaps so they breathe.

Cheap fasteners that streak the deck

Mild-steel screws bleed rust streaks down hardwood boards in one winter. We use stainless or coated decking screws as standard.

Our Process

A defined system — so you know exactly what happens next

  1. Step 1

    Design & site survey

    Site visit, sketched design, materials options (composite vs hardwood vs softwood), and an honest view on whether what you want is going to work in your soil and aspect.

  2. Step 2

    Sub-frame & foundations

    Concrete pads, ground screws or paving slabs set out to a tight tolerance. Pressure-treated C24 joists at 400mm centres for composite, 450mm for timber. Cross-bracing on raised decks.

  3. Step 3

    Decking installation

    Boards laid with consistent expansion gaps using a spacer. Stainless or coated screws. End-cuts treated with end-grain preserver. Hidden fixings available on premium composite and hardwood schemes.

  4. Step 4

    Structures (pergolas, garden rooms, gates)

    Posts concrete-set or galvanised-saddle fixed. Beams and rafters bolted with structural fasteners. Roofing in EPDM, polycarbonate or shingles per design. Fully insulated for garden offices.

  5. Step 5

    Finish & sign-off

    Decking and timber finished with oil or stain per client choice. Snag walked with you. Care notes left for maintenance — usually a single annual clean and re-oil.

The benefits

What you get when D2 delivers the job

Sub-frame guaranteed 15 years

Pressure-treated C24, ventilated, with proper post detailing. Decking boards carry the manufacturer's warranty separately.

Designed for British weather

Drainage falls built in, expansion gaps respected, fasteners chosen for wet conditions. No surprises in February.

Tight tolerances

Boards laid to consistent gaps, edges bull-nosed or trimmed flush, fascia boards mitred at corners. Looks designed, not bolted together.

Composite or timber — your choice

Composite for zero-maintenance, hardwood for warmth and patina, softwood for budget. We carry samples and explain the trade-offs.

Garden rooms fully insulated

Timber-frame, breathable membrane, mineral wool insulation, weatherboarded or rendered finish. Useable year-round.

Adds real value to outdoor space

A well-built deck and pergola measurably lifts perceived value and resale — outdoor space matters now in a way it didn't 10 years ago.

In Detail

Materials, methods and the situations they suit

Outdoor structures look simple but failure modes are unforgiving. The Merseyside climate is wet, the soils are clay-heavy, and the wind off the Mersey is no joke. Below is what we build, in the detail that determines whether it lasts 5 years or 25.

Composite decking (Trex, Millboard, Ecodek)

Composite boards eliminate the annual oil-and-stain maintenance of timber, with a 25–30 year manufacturer warranty against fade and decay. Higher upfront cost, much lower lifetime cost. Hidden fixing systems give a clean finish with no visible screws. We install to the manufacturer's joist-spacing and fastener specs so the warranty stays valid.

Hardwood decking (Yellow Balau, Ipe, Garapa)

Hardwood has warmth and a long patina life. Properly installed with stainless fixings and end-grain treatment, hardwood lasts 25+ years in our climate with annual oiling. We pre-drill all fixings to avoid splitting and chamfer board edges for a furniture-grade finish.

Pergolas, gazebos and carports

Pergolas in pressure-treated softwood or oak — posts concrete-set 600mm into ground, beams bolted with M12 coach bolts, rafters housed into beams. Adjustable louvre roofs available for shade control. Carports built to take vehicle weights with appropriate post and beam sizing.

Garden rooms and outdoor offices

Timber-frame structures on engineered foundations (concrete pads or ground screws), insulated to current Approved Doc L guidance, weatherboarded externally and plasterboarded internally. Electrics first-fixed and certificated. Most stay under permitted development (no planning) provided they meet specific height and use rules. We confirm at the survey.

Gates, fences and screens

Driveway and side gates in softwood, hardwood or steel-framed timber. Hung on heavy-duty pintles and concrete-set posts. Automated gate motors fitted by partner specialists. Screens for hot tubs, bins and air conditioners built to match existing fencing or as a feature.

Frequently Asked

Decking & Outdoor Structures — your questions answered

Pressure-treated softwood: £140–£190/m² fitted. Hardwood: £220–£310/m². Composite: £240–£340/m². Pricing includes sub-frame, boards, fasteners and labour. Steps, balustrades and pergolas extra.
D2 Joinery FireQual-certified fire doors and bespoke joinery services across Liverpool and Merseyside

Get a fixed quote for your outdoor build.

Free site visit across Liverpool & Merseyside. Sketch, materials samples and indicative budget within 7 days.

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