Driveway Advice
How long should a tarmac driveway last?
Tarmac says a properly installed asphalt driveway should generally last up to 20 years. That is a manufacturer benchmark, not a guarantee for every driveway: service life depends on the asphalt product, installation quality, vehicle type and frequency, turning loads, drainage, weather and maintenance. A Portsmouth quote should identify the asphalt specification, base construction, drainage and workmanship cover so the expected performance can be judged from the whole build-up rather than the black surface alone.
Twenty years is a benchmark, not an automatic outcome
Tarmac's homeowner guidance says a properly installed asphalt driveway should generally last up to 20 years. It also says lifespan varies with the product, traffic, vehicle type, turning, weather and installation quality. Treat the figure as a useful comparison point when reviewing a quote, not as proof that any unitemised tarmac job will achieve it.
The base carries the vehicle load
The asphalt surface distributes loads, but the compacted construction below it prevents rutting and settlement. A quote should state what will be excavated, the sub-base material and compacted depth, any regulating or binder course, and the finished surface course. If the base is unknown or weak, resurfacing alone may leave the cause of dips and cracks in place.
Turning and heavier vehicles increase stress
Tarmac specifically lists vehicle type, traffic and turning as service-life factors. Repeated steering while stationary can scuff or deform a young or overheated surface, while vans, motorhomes and delivery vehicles create different loads from an occasional family car. Tell the installer how the driveway will actually be used so the construction can be specified for it.
Drainage protects the construction
Standing water and water entering weak joints can accelerate deterioration and expose poor falls. Government guidance says permeable driveways need a permeable sub-base, while an impermeable surface should direct water to an appropriate permeable area or drainage solution. The quote should show finished levels, falls and where runoff will go without sending it onto the highway or a neighbour's land.
Written scope makes guarantees comparable
A headline guarantee is only useful when its coverage and exclusions are clear. Ask for the asphalt product or mix description, layer thicknesses, base and drainage scope, curing or reopening instructions, and separate workmanship terms. Those details make it possible to compare two quotes that might otherwise both say only new tarmac driveway.
What to ask before accepting a tarmac quote
- Which asphalt product or mix is proposed for the surface and lower course?
- What will be excavated and what compacted base depths are included?
- Has the construction been designed for the vehicles and turning movements expected?
- Where will rainwater go and will the surface be porous or impermeable?
- What workmanship guarantee applies and what maintenance is required?
| Factor | Why it matters | Evidence to request |
|---|---|---|
| Asphalt product | Different mixes suit different loads and finishes | Named mix or written performance specification |
| Base construction | Weak or poorly compacted layers can rut and settle | Materials, compacted depths and preparation scope |
| Vehicles and turning | Heavy loads and stationary steering increase surface stress | Design use recorded in the quote |
| Drainage and falls | Water should not pond or run onto the highway | Finished levels and runoff destination |
| Workmanship cover | Installation quality is one of Tarmac's lifespan factors | Written terms, exclusions and claim process |
Frequently asked questions
- Does every tarmac driveway last 20 years?
- No. Tarmac says a properly installed asphalt driveway should generally last up to 20 years, while also listing product, traffic, vehicle type, turning, weather and installation quality as factors that change the outcome.
- Can new tarmac be laid over an old driveway?
- Sometimes, but only after the existing surface and base have been assessed for stability, levels, cracking and drainage. Covering an unresolved base failure can allow the defect to return through the new surface.
- Will vans shorten a tarmac driveway's life?
- Vehicle weight, frequency and turning all influence stress. Regular vans or motorhomes should be declared before quoting so the base and asphalt build-up can be designed for the actual use.
- Is porous asphalt available for driveways?
- Yes. Tarmac says it offers porous asphalt products, but permeability depends on the complete construction, including a suitable open-graded base and lawful runoff design.
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