A new roof is one of the most significant investments you will make in your home, and getting the installation right is only half the job - what you do in the years afterwards determines how long it performs.
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A full roof replacement means stripping the existing covering back to the bare timbers, checking every rafter, purlin and ridge board for rot or movement, and then building back up with new felt underlay, battens and the chosen covering. Skipping any of those checks is where problems begin. Soft or springy timber under new tiles is a common cause of premature failure, and it is far cheaper to deal with while the roof is open than to revisit it in five years.
The work typically takes two to five days on a standard semi-detached or detached house, depending on pitch, access and the material being laid. Clay plain tiles are one option where a more traditional appearance matters - they are heavier, so the structure needs to be sound, but they weather beautifully and last a very long time when well maintained.
Several materials are used on new pitched roofs. Each has different characteristics, costs and maintenance needs, and the right choice depends on your existing roof structure, your budget and how you want the finished roof to look.
These figures are broadly typical for the UK at the time of writing, but the actual cost of your roof will depend on the size and pitch of the roof, whether there is scaffolding involved, how much timber work is needed underneath, and any details like valleys, hips, dormers or chimneys. A roof with multiple changes of direction costs more per square metre than a simple gable end.
Scaffolding goes up first - on most two-storey houses this is a full perimeter scaffold to allow safe access all the way round. The old covering is then stripped and the waste taken away. At this point the timbers are inspected and any replacements or reinforcements are priced up and agreed before the new underlay goes down.
Breathable underlay has largely replaced traditional felt on new roofs because it allows moisture vapour to escape from the loft space without letting rainwater in. Battens are then fixed over the underlay to create the fixing point for the tiles or slates. Ridge and hip tiles are bedded in mortar or mechanically fixed with a dry-fix system - dry-fix is now standard practice because mortared ridges and hips crack over time as the roof moves with temperature changes.
Lead or code-equivalent flashing is dressed into any abutments, around chimneys and along valleys. The quality of this flashings work matters enormously - most roof leaks trace back to failed or poorly fitted flashings rather than the tiles themselves. When the covering is on, the scaffold comes down and the site is cleared.
A straightforward replacement on a three-bedroom semi-detached house - approximately 50-60 square metres of roof area - typically costs between £6,000 and £10,000 depending on the material chosen and the state of the timbers beneath. A larger detached house with hips, a chimney and a more complex layout could be £12,000 to £20,000 or more. These are realistic current UK ranges, not a quote for your specific property.
Always get a written breakdown that separates the material costs, the labour, the scaffold hire and any timber replacement. That makes it easier to compare quotes like for like. A significantly cheaper quote often means something has been left out, such as the scaffold or the cost of disposing of the old tiles.
A well-installed roof with quality materials should not need any attention for the first several years. But that does not mean ignoring it completely. The difference between a roof that lasts forty years and one that starts causing problems at fifteen is almost always down to simple maintenance that was either done or not done.
This is the part of the job that rarely gets talked about, and it is where most homeowners lose money unnecessarily. The installation creates a sound structure; the maintenance keeps it that way. Getting into a straightforward annual routine is not expensive, and it protects an investment that cost thousands of pounds.
Once a year, ideally in autumn before the worst weather arrives, spend a few minutes looking at the roof from ground level with a pair of binoculars. You are not trying to diagnose every fault - you are looking for obvious changes from last year.
None of these checks require you to go near the roof yourself. If something looks different from last year, or you are not sure, that is the time to call a roofer for a proper look before a small issue becomes a large repair.
A new roof sheds water efficiently, but only if the gutters carry that water away cleanly. Blocked gutters are one of the most avoidable causes of roofing and fascia damage. Leaves and debris from nearby trees build up over autumn and winter, and if the water cannot flow to the downpipe it sits in the gutter and eventually overflows. Persistent overflow against a fascia board causes the timber to rot, and once the fascia goes the gutter loses its fixing point.
Having the gutters cleared every autumn - before the leaves fall fully in October and November - keeps the drainage working and lets you spot any joint that has opened up or a section that has dropped and is no longer pitched towards the downpipe. This is a simple, low-cost job that saves significant money over time. Where deciduous trees grow near houses, gutter clearing is a sensible annual task rather than an optional one.
Some moss growth on tiles is normal, particularly on north-facing slopes or under tree canopy. A modest amount does no immediate harm. Heavy, established moss is a different matter because it holds moisture against the surface of the tile, accelerates the weathering of the material and can work its way under tile edges, lifting them slightly over time.
The correct approach is to have the moss treated chemically - a biocide applied to kill the growth - and then allow the dead material to wash off naturally over several months. Pressure washing is sometimes offered as a quicker solution, but it drives water under tiles, can dislodge granules from mineral felt and risks cracking older or brittle tiles. On a new or recently replaced roof, a periodic biocide treatment is the sensible option. It is not urgent in the first few years, but worth considering before the moss gets established.
Lead flashings around chimneys, at abutments with walls and in valleys are the points where water is most likely to find a way in if they fail. On a new roof the flashings will be in good condition, but they are worth including in your annual check because lead can be lifted by wind, and the mortar or mastic that seals the top edge into a brick chase can eventually work loose.
A flashing that has pulled away from a wall by even a few millimetres can let water track behind it and into the roof space during driving rain. The repair is straightforward - repointing the chase and pressing the lead back in - but it needs to happen before sustained wet weather turns a hairline gap into a water stain on the ceiling below. Catching it early keeps the repair inexpensive.
A new roof is an opportunity to make sure the loft ventilation is correct. Modern breathable underlays help, but ridge vents and eaves vents work together to allow a flow of air through the loft space. Without adequate ventilation, condensation builds up on the underside of the roof deck and on the timbers, causing mould and eventually rot that undermines the very structure that was just renewed.
If your loft is insulated at rafter level rather than joist level - a warm roof - the ventilation requirements are different again, and it is worth discussing this with your roofer at the time of the installation to make sure everything is compliant with current building regulations. Getting it right from the start avoids condensation problems that can be difficult to diagnose later.
After any significant storm, it takes five minutes to go into the loft with a torch and check for daylight or damp spots on the rafters. Daylight visible from inside the loft means a tile or slate is displaced. Damp patches on timber do not always mean an active leak - condensation is sometimes the cause - but they are worth monitoring. If a damp patch is there after a dry spell, condensation is likely; if it appears or worsens after rain, there is a leak to trace.
Catching a displaced tile early - before it lets in a sustained period of rainfall - is the difference between a quick repair and a patch of damaged insulation or plasterboard that needs replacing. That is the value of the loft check: not finding something serious, but finding something small while it is still small.
Most straightforward roof replacements on standard residential properties do not require planning permission - the permitted development rules allow like-for-like replacements without an application. Exceptions include listed buildings and properties in conservation areas, where any change to the external appearance may need consent. It is worth checking with the local planning authority before work starts if you are in any doubt, or if you plan to change the material from what was previously there.
Roof work that involves structural changes, such as raising the ridge or altering the pitch, will almost certainly need both planning permission and building regulations approval. A straightforward replacement of tiles or slates on the existing structure generally falls within permitted development, but it is always the homeowner's responsibility to check.
For a job of this size, it is sensible to get at least two or three written quotes. A reliable roofer will be happy to walk you through the quote line by line and explain what each element covers. If a quote arrives with nothing but a single total figure, ask for the breakdown - you need to know what you are agreeing to before any work starts.
Ask specifically whether the quote includes scaffold hire, waste removal and any timber replacement found during the strip. These are the items most likely to vary between quotes or to appear as extras once work has begun. A roofer who is upfront about these at the quoting stage is being honest about the job; one who mentions them only after the scaffold is up is not.
Check whether the roofer carries public liability insurance - this protects you if something goes wrong on your property. Ask to see evidence of it, not just a verbal assurance. It is a reasonable request and any reputable roofer will have the paperwork to hand.
Dereham Roofers install new roofs across Hethersett and the surrounding villages in mid-Norfolk. If you want to discuss materials, get a realistic idea of cost or book a roof survey before committing to anything, call us directly and we can arrange a time to come and take a proper look at what you have.
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