Gardens are one of the most common sources of renovation budget surprises, and the surprise usually runs in one direction. The patio that seemed like a weekend job becomes a two-week project once ground preparation is factored in. The fencing that was quoted at the fence panel price alone doubles once posts, concrete, and gravel boards are included. The raised bed project that seemed simple suddenly involves soil imported by the tonne. Getting realistic numbers before you start — rather than discovering them midway through — makes the difference between a satisfying project and a stressful one.
Patio and Hard Landscaping
Patio installation is one of the most popular garden projects in the UK, and costs vary enormously based on material choice and ground conditions.
Porcelain paving: £40–£80/m² for materials (large-format porcelain is now the most popular premium choice). Add £30–£50/m² for professional laying on a mortar bed over prepared sub-base. Total installed: £70–£130/m².
Natural stone (Indian sandstone, slate): £25–£60/m² materials; £25–£45/m² laying. Total installed: £50–£105/m².
Concrete flags: £8–£20/m² materials; £20–£35/m² laying. Most economical hard paving; less durable and lower aesthetic quality than stone or porcelain.
Ground preparation is the wildcard. All paving requires a compacted sub-base (typically 100mm of Type 1 MOT stone) and a mortar or sand bed. On well-drained firm ground this is relatively straightforward. On clay soil or where existing hard surfaces need breaking out, excavation and disposal costs can add £10–£30/m² to the project before any paving is laid. Use our concrete calculator to estimate the mortar quantities needed for bedding your chosen paving area.
Decking
Timber decking remains popular for its warmth, flexibility, and DIY accessibility:
Pressure-treated softwood decking: £15–£30/m² materials. Budget option with adequate durability if correctly maintained (annual oiling or staining). Lifespan 10–20 years with care.
Hardwood decking (balau, ipe, composite hardwood): £30–£70/m² materials. Better longevity, reduced maintenance, richer appearance.
Composite decking: £40–£80/m² materials. Low maintenance (no annual treatment required), durable, splinter-free. Higher initial cost recovered in zero maintenance over a 25-year lifespan.
Installation adds £20–£40/m² for professional laying, including subframe and fixings. Decking above 300mm ground clearance requires building regulations notification in some circumstances; check with your local authority if you're planning a raised deck.
Fencing
Fencing is consistently under-estimated because the panel price is only one element of the total cost. A complete fence installation involves: fence posts (typically one per 1.8m bay plus end posts), concrete for post-setting, post spurs or gravel boards if ground conditions are difficult, arris rails, and the fence panels or close-board boards themselves.
Use our fence calculator to work out how many panels, posts, and concrete bags you need for any fence run length. For a 20-metre garden boundary fence at standard 1.8m panel width: approximately 11 bays, 12 posts, 24 bags of post-mix concrete, and 11 panels — the full materials list rather than just the panel count.
Typical total installed cost for close-board timber fencing: £100–£180 per linear metre including all materials and labour. Featherboard panels: £70–£120/m. Concrete post-and-panel system: £80–£140/m.
Raised Beds and Planting Areas
Raised bed construction costs are primarily materials (timber, brick, or stone for sides) plus the fill volume. Use our square footage calculator to find the base area, then calculate fill volume by multiplying area × depth. A 2m × 4m raised bed filled to 400mm depth requires: 2 × 4 × 0.4 = 3.2 cubic metres of growing medium.
Topsoil costs £20–£40/m³ bulk-delivered; compost and soil improver add another £15–£30/m³ for a proper growing mix. For 3.2m³, budget £110–£220 just for the fill material — often significantly more than the timber frame itself.
Lawns: Seed vs Turf
Lawn establishment costs: seed is dramatically cheaper (£3–£8/m² total including soil preparation) but requires 3–6 months to establish and is more vulnerable to weed competition. Turf provides instant results: £8–£15/m² materials plus £3–£8/m² laying. On prepared, level ground, laying turf is a feasible DIY project for a typical garden — on poor soil with significant levelling required, professional preparation is usually worthwhile.
For large plot areas, use our land area calculator to convert between different area units — useful when turf is quoted per pallet (typically 20m² or 28m² per pallet depending on supplier) and your measurements are in square metres.
Lighting and Irrigation
Garden lighting and irrigation are often added as afterthoughts and budgeted as afterthoughts accordingly. Installing cabling for garden lighting before laying paving costs a fraction of retrofitting it afterwards. Similarly, installing irrigation pipework before laying turf or mulch is far simpler than retrofitting. Budget £500–£2,000 for a decent garden lighting scheme and £800–£3,000 for a drip irrigation system depending on garden size and complexity.
The Royal Horticultural Society provides detailed guidance on garden planning and budgeting with project-specific cost guides updated annually for the UK market.
Prioritising Your Garden Spend
If budget requires prioritisation, a useful framework is to address structural and drainage work first (pathways, drainage, retaining walls), then utility features (shed, compost, vegetable growing area), then aesthetic improvements (planting, lighting, water features). Structural elements are expensive to retrofit once soft landscaping is established. Aesthetic improvements can be phased over several years as budget allows.
Hard landscaping (patios, paths, fencing) retains value and reduces ongoing maintenance. Planting schemes appreciate over time as plants mature, but involve upfront cost that primarily delivers aesthetic rather than financial return. If the garden is a selling point for the property, structural hard landscaping typically adds more to property value than equivalent spend on planting.
Getting multiple quotes for all significant groundwork is especially important in the garden trade, where price variation between contractors for identical scope is wider than in many other trades. Membership of the Landscape Institute or the Association of Professional Landscapers provides some quality assurance for larger projects — credentials worth checking before committing significant spend.