Garden paving goes down on a solid sub-base with a gentle fall for drainage, then onto full-bed mortar and tight, sealed joints.
Ready to build a neat patio or path that lasts? This guide walks you through layout, levels, layers, and clean finishing. You’ll set gradients that move water away from the house, choose a base that suits the soil, and bed slabs so they don’t rock or sink. Where exact figures matter—falls, sub-base depth, and movement joints—you’ll see links to trade guidance.
What You’ll Need And Why
Good results start with the right kit. The list below covers tools and materials that keep edges straight, layers dense, and joints tidy. You won’t need every item in every garden, but this loadout covers most patios, paths, and seating areas.
| Item | Use | Notes |
|---|---|---|
| String Line & Pegs | Mark layout and falls | Run diagonal checks for square |
| Spirit Level & 2 m Straightedge | Set gradient and plane | Find humps and dips fast |
| Plate Compactor | Compact sub-base | Several passes in thin layers |
| Spade, Rake, Shovel, Tamper | Excavate and shape | Keep sides neat for haunching |
| Type 1 MOT (Granular Sub-Base) | Foundation layer | Commonly ~100 mm compacted for patios |
| Sharp Sand & Cement | Full-bed mortar and joints | Typical bedding mix 4:1 or 5:1 |
| Slurry Primer/Slab Bond | Improve adhesion | Vital for porcelain and smooth backs |
| Paving Units | Surface | Porcelain, concrete, or natural stone |
| Jointing Compound/Grout | Seal and lock | Pick for joint width and traffic |
| Edge Restraint | Hold layout | Concrete haunch, kerb, or setts |
| Drainage Channel Or Soakaway | Carry water away | Fit where falls alone aren’t enough |
| PPE | Safety | Gloves, glasses, ear and dust protection |
Plan The Layout And Levels
Sketch the area with true sizes. Mark doors, steps, air bricks, manholes, and fence lines. Keep finished paving at least 150–200 mm below indoor floor level and clear of air bricks. Plan a steady gradient that sends water away from the house. A common fall for patios is around 1 in 60 to 1 in 80; riven stone often prefers the steeper end to shed puddles. For a trade explainer on suitable falls and why they differ by surface, see pavingexpert: laying flags.
Work out total drop. If the run is 4 m at 1:60, the difference from high to low is about 67 mm. Set that on pegs and run string lines so every course follows the same plane. Check door swing and any transitions to lawn or gravel. Near thresholds, plan for a discreet channel drain if space is tight.
Site Prep And Dig-Out
Strip turf and soft topsoil until you’re clear of organic material. Depth depends on the build-up: compacted granular base, mortar bed, and slab thickness. Many domestic patios sit well on about 100 mm compacted Type 1, plus a 30–40 mm mortar bed, plus the slab thickness. Heavy clay or high traffic calls for a deeper base and better drainage. Shape the dig-out so water keeps moving in the direction you planned.
Laying Paving For A Small Garden: Step Plan
This workflow suits a typical patio or path on granular base with a full-bed mortar. Adjust joint width, grout, and primer to match your exact product.
1) Set Reference Lines
Drive corner pegs, then run string lines for edges and the fall. Use a long level on a straightedge to confirm the strings match the gradient on your sketch. Pull strings tight so they don’t sag mid-span. Add a few intermediate pegs on longer runs.
2) Install The Sub-Base
Spread Type 1 in layers of about 50 mm and compact after each pass. Keep lifting any soft spots and refill before the next pass. Shape this layer to the same fall you planned, not dead flat. A true base makes bedding faster and keeps water heading in the right direction.
3) Add Edge Restraints
Edges stop spread and keep joints tight. Haunch kerbs or pour a concrete perimeter while the base is still exposed. Keep the top set to your line and fall. Let the haunch cure before bedding slabs that sit against it.
4) Mix And Spread The Bedding
Use a full-bed mortar—no dabs. A common bedding mix is sharp sand to cement at roughly 4:1 or 5:1, mixed stiff so slabs don’t sink. For porcelain and very smooth units, brush on a slurry primer right before they go down so the slab bonds cleanly to the bed. Keep bed thickness in the 30–40 mm zone to make fine level tweaks without starving the slab.
5) Lay The First Course
Start from a straight edge or the corner that’s most visible from the house. Butter the back if the manufacturer specifies it. Drop each unit onto the bed and tap down with a rubber mallet until it hits plane with your string line. Keep even joints. Check square and pattern alignment every few slabs so lines stay crisp.
6) Keep The Plane While You Progress
Work off boards so you don’t mark the fresh mortar. Check the plane with the 2 m straightedge set to your fall. If a unit rocks, lift it now, adjust the bed, and reset. Skim away squeezed mortar before it cures in the joints. Keep waste out of drainage points.
7) Cut Slabs Cleanly
Use a wet saw with a diamond blade or a suitable grinder. Mark the cut, clamp the slab, and cut in one steady pass. Wear eye and ear protection and keep dust down with water where possible. Place cut edges against walls or in less visible runs.
8) Drainage Add-Ons Where Needed
Near door thresholds or on long runs, channel drains help. Form the trench to match the patio fall so water feeds the grate and out to a soakaway or approved discharge. Set the grate edge a touch below the paving surface so water finds it easily. Keep the channel straight, supported, and aligned before you start jointing.
Soil And Base Tweaks That Save Headaches
Free-Draining Ground
Sandy soils compact well and shed water through the base. Stay with the standard granular depth and focus on a clean plane and even compaction. A geotextile under the base helps stop fines migrating into the soil over time.
Sticky Clay
Clay holds water and can pump when trafficked. Go a bit deeper on the base, use well-graded Type 1, and compact in thinner lifts. If the area stays wet, a perforated land drain feeding a soakaway can protect the build-up.
Soft Spots
If your heel sinks in the dig-out, over-excavate that patch, fill with Type 1, and compact until it firms up. Don’t try to hide soft pockets beneath a thicker mortar bed—fix the base first.
Jointing And Movement
Once the bed sets hard, joint the surface. For tight joints on porcelain, a cement-based grout or resin jointing works well. For riven stone with wider gaps, a brush-in compound may suit. Follow the product’s wet-on-wet or dry method as stated on the bag, and clean as you go to avoid stains.
Large bound areas need movement joints so the surface can deal with temperature and moisture swings. A flexible filler and sealant forms a clean break line between bays or where paving meets a fixed wall. Trade guidance explains layout and detailing—see movement joint guidance.
Drainage, Falls, And Threshold Checks
Water shouldn’t sit on the surface or run toward the house. A steady gradient like 1:60 to 1:80 sends it away without feeling steep underfoot. That range matches common trade practice; a clear note on falls sits here: pavingexpert: laying flags. Near doors, keep the top of the paving below the damp-proof course and clear of air bricks. Where a long run meets a tight threshold, a narrow channel drain solves the transition neatly.
Material Choices And Where They Shine
Porcelain: crisp edges, low porosity, stain-resistant. Needs a primer for bond and tight joints. Works well in small gardens where a clean look helps the space feel larger.
Concrete Slabs: steady under foot traffic and easy on the budget. Plenty of finishes and sizes. Joint widths are flexible and cutting is straightforward.
Natural Stone: characterful surfaces and color shifts. Riven stone likes slightly wider joints and a steeper fall to shed water. Sealers can deepen tone and help with stain control.
Pattern Tips That Help The Eye
In compact spaces, run long edges parallel to the main sightline to make the area read wider. Break big rectangles with a contrasting header or soldier course. Keep small offcuts out of prime view. Line up joints with door sills or step nosings so the layout looks intentional.
Measuring Quantities Without Guesswork
Work out sub-base by area and depth, then allow for compaction and a touch of wastage. Mortar volume follows from bed thickness and slab coverage. Order jointing by joint length, width, and depth—most compounds give a coverage chart on the tub. When in doubt, buy an extra bag of Type 1 and one extra grout pack; unopened, they store well and save an emergency dash.
Simple Quantity Planner
Use this table to sketch numbers before ordering. Adjust depths to match your design and soil.
| Layer | Typical Depth | Notes |
|---|---|---|
| Type 1 MOT | ~100 mm compacted | Split into two 50 mm passes |
| Mortar Bed | 30–40 mm | Full bed; fine-tune plane here |
| Paving Thickness | 20–40 mm | Porcelain at the thin end; stone thicker |
Edge Options And Restraints
Concrete Haunch: fast and reliable. Form a low, sloped haunch against the edge course and trowel smooth so water doesn’t sit on it.
Kerb Or Sett Border: adds a visual frame and resists creep. Sit the border on the same base and bed as the field units so the whole edge moves together.
Hidden Steel/Alu Edging: handy for curves and gravel transitions. Fix to the base before bedding the field units, then backfill neatly.
Common Pitfalls And Simple Fixes
Puddles After Rain
Cause: dead-flat spots or humps interrupt the gradient. Fix: lift local slabs, true the bed to the fall, and relay. Near doors, add a slim channel if the threshold limits the drop.
Rocking Slabs
Cause: spot bedding or voids. Fix: reset on a full bed. Butter the back if the product calls for it, then tamp to the line with a mallet and straightedge.
White Bloom
Cause: efflorescence during early cure. Fix: it fades with time; brush when dry. Keep heavy washing off fresh joints in the first weeks.
Loose Joints
Cause: traffic, edge movement, or the wrong product for the joint width. Fix: rake out, re-grout, and check that edges and base are sound before you refill.
Safety, Timing, And Weather Windows
Pick a dry spell with mild temperatures. Stage the work: dig-out and base one day, bedding and laying the next, jointing after the bed has set. Cover fresh areas overnight. Cement products set faster in warm weather and slower in cold, so read the bag for set and cure times and adjust your pace.
Care And Long-Term Tidy Look
Sweep grit so the finish doesn’t scuff. Wash with a soft brush and a mild cleaner. Skip harsh acids on cement-based joints and on calcareous stone. If a joint cracks, rake and refill before water reaches the bed. In shaded corners, an occasional biocide wash keeps algae in check. Reseal stone only when the maker recommends it and the surface is fully clean and dry.
Quick Layout Checklist
- Finished level sits below thresholds and air bricks
- Strings set to a steady fall away from the house
- Sub-base compacted in thin layers, shaped to the same fall
- Full-bed mortar, mixed stiff; primer on smooth backs
- Even joint widths that suit the material and traffic
- Movement joints at bay breaks and abutments
- Water directed to lawn, soakaway, or channel drains
When To Call A Pro
Bring in a contractor if you have steep ground, sticky clay that holds water, lots of cuts around manholes or steps, or drainage rules you’re unsure about. A good installer brings the right compaction gear, plans around weather, and can show a simple drawing that sets out levels, joints, and any drains before work starts.
Wrap-Up And Next Steps
You now have a clear path from sketch to sealed joints. Start with levels and drainage, build a dense base, set a true plane with a full mortar bed, and finish with clean, tight joints. That sequence gives you a patio that sheds water, stays flat, and looks sharp for years. For fall figures and movement-joint detail, the trade pages linked above are handy refreshers while you work.