Patio Extensions & Resurfacing Questions

Yes. A poor sub-base means excavating deeper, adding compacted hardcore and sharp sand, and re-establishing correct falls before any new surface goes down. This adds time and material cost. Skipping it and laying over a bad base guarantees the same problems return within a couple of seasons, so it is not a step that can be cut.

Yes, in most cases. Slabs are lifted, the sub-base is re-compacted or rebuilt, and the surface is re-laid to the correct falls. If the ground beneath is soft clay or has been disturbed by roots, that underlying issue needs addressing first. The survey can assess whether re-levelling alone is sufficient or whether deeper groundwork is needed. See also Patio Drainage & Levelling.

Resurfacing costs vary with area size, material choice and base condition. Most jobs come in at £900-£2,000, with porcelain at the higher end and concrete or block paving at the lower. A survey gives you an accurate figure once the base has been assessed.

Extension costs depend on the size of the new area, the material specified and how much groundwork is needed. Most extensions are priced at £900-£2,000, with excavation depth and drainage requirements the main variables. Tell us the dimensions and we will quote properly.

The most common surprises are a failed or shallow sub-base that needs rebuilding, poor drainage requiring extra falls or a channel drain, and tree roots or buried rubble that need clearing. These are only visible once the old surface is up, which is why a survey beforehand reduces but does not always eliminate unexpected costs.

Concrete block paving and reconstituted stone are generally the most cost-effective resurfacing materials. Keeping the existing sub-base where it is sound also reduces labour. Costs still vary with area and access, so the cheapest overall route depends on your specific site rather than material choice alone.

Yes, sections in good condition can often stay. If part of the base is sound and levels are consistent, the work can extend or resurface only what needs attention. A survey confirms which sections are worth keeping before any lifting begins.

Small areas can be resurfaced by a competent DIYer if the base is flat and stable. However, getting levels, falls for drainage, and mortar mix right is harder than it looks, and mistakes on even a small area can mean relaying the whole thing. A quote is available so you can weigh the cost against the risk.

Leaving a sunken or cracked patio through wet winters usually makes it worse. Water gets under loose slabs, freeze-thaw cycles widen cracks, and a soft sub-base continues to settle. A patio that needs resurfacing now may need full base replacement by next spring if left untreated.

Yes. Indian sandstone and limestone work well alongside Victorian and Edwardian brickwork, while period-style concrete flags suit inter-war semis. The survey can advise on which of the available materials, porcelain, sandstone, limestone or block paving, best suits the age and character of the property.

Resurfacing works when the base is solid and level but the surface is worn, stained or cracked. If slabs have shifted, the sub-base has failed, or drainage is poor, a full replacement is the right call. A survey will confirm which applies, the base condition is the deciding factor, not the surface appearance alone.

An exact match is rarely possible, since existing slabs weather and fade over time. The most reliable approach is choosing a complementary material or running a defined edge detail between old and new. The survey can advise on porcelain, sandstone, limestone or block paving options that sit well alongside what you already have.

Check whether the base is still level and compact, whether drainage is working, and whether the movement is isolated or widespread. Patching one or two slabs makes sense when the rest is sound. If more than a third of the surface has shifted or the sub-base is soft, repair costs often approach replacement costs without fixing the root cause.

Patching buys time if the damage is isolated and the base is sound. If the surface has widespread cracking, staining or movement, patching looks inconsistent and rarely lasts more than a season before more patches are needed. Resurfacing the whole area costs more upfront but removes the cycle of repeated small repairs.

Replacing one or two loose slabs is within reach for a careful DIYer with the right tools. Getting consistent levels, correct mortar mix and adequate drainage falls across a larger area is harder and errors are difficult to reverse. For anything beyond a couple of slabs, a quoted job will produce a more durable result.

Not on its own. If the patio has moved, the sub-base has shifted and laying new slabs over it will produce the same result within a season or two. The base needs to be lifted, re-compacted and re-levelled before resurfacing. Resurfacing without addressing base movement is the most common reason patios fail again quickly.

A straightforward extension to an existing patio typically takes one to three days, depending on the area and how much groundwork is required. Larger extensions or those needing significant sub-base work will take longer. Mortar and jointing compounds then need 24 to 48 hours to cure before the surface is walked on.

Resurfacing a typical garden patio usually takes one to two days once the old surface is lifted. If the base needs rebuilding, add another day. Allow 24 to 48 hours after laying before using the surface, and longer if resin or specialist jointing is specified.

Lifting old slabs and excavating generates rubble, dust and spoil. Waste is removed and the finished area is left clean, but expect the surrounding garden to need tidying after access routes are used. Confirm waste removal is included in your quote before work starts.

Falls for surface drainage are set as standard during laying, water needs to run away from the house. Edge restraints and channel drains can be included where needed. Confirm the scope with your installer at survey stage so drainage and edging are priced into the job from the start.

Late spring through early autumn is ideal, mortar and jointing compounds cure best above 5°C with low moisture. Winter laying is possible but requires frost protection and longer curing times. Avoid laying during heavy rain or when ground frost is forecast within 48 hours of completion.

Clay shrinks and swells with moisture, which is the main cause of paving movement in Cambridgeshire gardens. The fix is to excavate to a sufficient depth, lay a compacted hardcore sub-base thick enough to bridge the clay movement, and set correct drainage falls so water does not pool and saturate the ground beneath. See Patio Drainage & Levelling for more detail.

Many extensions do not require permission, but size, drainage impact, boundary proximity and conservation area status all affect this. Cambridge has several protected streets and listed settings where external ground works need a check before levels are altered. The installer flags this at survey stage.

Rocking slabs accelerate joint failure and allow water to undercut the bedding layer further. What starts as a repointing job can become a full lift-and-relay if the base deteriorates through a wet winter. Catching it early keeps the scope, and the cost, smaller.

Often yes, particularly with concrete and natural stone. Where an exact match is not available, a contrasting border course is agreed before work starts so the join reads as a deliberate design detail rather than a visible repair.

Surface water must drain away from the house and not increase run-off to neighbouring land or the highway. The drainage check at survey confirms fall direction and outlet position. Where the existing fall cannot be corrected by re-bedding, a drainage channel is specified to meet the requirement.

Yes, if the sub-base and overall structure are still sound. Pressure washing, repointing, levelling individual slabs and resurfacing can all refresh the area without a full rebuild. The site assessment determines which combination of these is appropriate for the condition found.

Most patio extensions at ground level fall under permitted development and need no planning permission. The exception is if you are in a conservation area, the patio drains onto the ground rather than a soakaway or drainage system, or the area exceeds certain thresholds. Check with your local planning authority if you are unsure about your specific plot.

Raise any concerns with the contractor named on your estimate before the job is signed off. Workmanship defects are addressed on request. If there is a problem with the finished work, contact us and we will help you reach a resolution.

Guarantee and insurance terms vary by contractor. Ask the contractor named on your estimate to confirm their public liability cover and any workmanship guarantee before work starts, and get the specific terms in writing as part of your quote acceptance.