Hertfordshire · London and the South East
Knebworth Flat Roof Survey
Flat roof surveys for homes and businesses in Knebworth. We’ve completed more than 5,000 surveys across London and the South East.
- Standing water left after rain
- Gaps at upstands and abutments
- Edge trims that have lifted or split
What happens on the day
Time on site depends on the size and shape of the roof; as a rough guide, the survey takes about 1–2 hours for a small flat roof at home, and longer for a large commercial one. You’re welcome to ask questions while we’re there. Homes around Knebworth often have gardens on more than one side, which gives us room to step back and see the roof. Let us know if any side is fenced off or hard to reach. The loft, where there is safe access, completes the picture.
- We agree the roof to be surveyed, its use and any leaks you know about.
- We look at the roof from the ground, windows and the roof where it’s safe.
- We check the covering for splits, blisters, ponding and wear.
- We photograph and record the outlets, upstands, trims and rooflights.
- The report, with photos and recommendations, comes to you by email.
Before the survey
- Leave a clear route to the loft
- Find any records of previous roof work
- Leave side gates unlocked
How to book
Booking is simple: just call 07833 053749 or use the contact form and give us some details about the property and we will explain which survey suits. The price is agreed up front.
Related advice
About our flat roof survey in Knebworth
Ponding is often the first sign that something on a flat roof isn’t right. It can point to poor falls, a blocked outlet or a deck that is deflecting. The survey notes any ponding, the state of each outlet and any dips that hint at a sagging deck. If the deck itself looks like a structural concern, we will recommend a structural engineer. We survey single-ply membranes, mastic asphalt and GRP fibreglass, and common reasons people get in touch are dips that suggest the deck is deflecting and blocked or damaged outlets.
Around Knebworth, many homes have a garden room, garage or outbuilding with a flat roof. They’re easy to forget, but water through a garage roof can spoil whatever is stored inside. It is worth mentioning them when booking, so the visit can include them. Smaller roofs use the same coverings as bigger ones, from felt to rubber and GRP, and age in the same way.
You can share the report with anyone who needs it: a seller or estate agent, an insurer, a roofer, a builder or a managing agent.
- Where
- Knebworth (SG3)
- Wider area
- Hertfordshire
- Cost
- From £150 inc. VAT
- Your report
- A written report with photos, by email
- Survey days
- Weekdays and weekends
- Insurance
- PI and public liability insurance
- Call
- 07833 053749
- Page updated
- 27 October 2026
Common questions in Knebworth
Do you cover smaller places like Knebworth?
We do. A small place gets exactly the same survey as a big one, with the route planned beforehand.
Does a conservation area affect roof work in Knebworth?
Historic England’s list shows listed buildings, and the local council can tell you about conservation areas. Listed building consent is needed for changes that affect a listed building’s special interest, and conservation areas can limit changes of roofing material.
Is ponding on a flat roof a problem?
Water that lies on a flat roof for days is a sign that something needs attention. The cause may be the outlets, the falls or the deck. We check each of these and record what we find.
Do you look in the loft space?
If it is needed and safe to reach, yes. We look for staining, damp, daylight and signs of movement, as far as the space allows.
Will I get photos?
Yes, every report has them. Pictures sit next to the findings they show, which makes the report easy to follow.
What’s in the survey report?
You get our findings in writing, part by part, with photos, finishing with recommendations. The most urgent items are made clear.
What do I do with the report?
The report arrives by email. With Standard there is a follow-up consultation; with Premium, an in-person consultation.
How we price flat roof surveys
All our prices include VAT. What changes the price is:
- Building height and the viewpoints available
- Chimneys, valleys, parapets and other details
- How many separate roofs there are, such as extensions, dormers and garages
- Whether it is a home or a commercial building
Every price we give includes VAT. Our price is from £150, including VAT. You will know the price for the job before you book.
Getting in touch
You don’t need to know any roofing terms. Just let us know:
- Your timetable, such as an exchange date
- Where water is showing inside, if it is
- The kind of building and roof involved
- What made you get in touch
To get a price for flat roof surveys in Knebworth, ring 07833 053749 or use the contact form. The address, the type of property and what you want to find out help us price the survey accurately.
What happens if roof problems are left?
Caught early, a split or open seam in a flat roof is often a small repair. Left alone, water can soak the insulation and the deck, and the job grows. A survey now shows which you’re dealing with. Around Knebworth, a leak in an older house can soak into timbers and plaster, and that’s a much bigger job than the original defect.
The Premium Survey includes thermal imaging and drone inspection where it applies, from £400 including VAT. We will tell you which package suits the questions you have.
Why us?
- 98% of clients satisfied
- More than 5,000 surveys completed
- Visits on any day of the week
- Independent findings on the roof’s condition
See how roof surveys are priced and what we found on two real jobs.
Nearby places to Knebworth
Also in Knebworth
How the survey changes by roof type
GRP fibreglass
GRP can crack if the deck beneath flexes or if the resin was laid too thin. Our report notes cracks and any sign that the deck is flexing.
Felt and built-up roofs
Many extensions, garages and dormers have a felt roof laid in layers. We look for blistering, cracking, split laps and worn mineral surfacing.
Surveys for landlords and agents in Knebworth
Managing agents and residents’ management companies use roof surveys to plan maintenance. Recommendations are set out in order of urgency where relevant, which helps with budgets and planning.
Landlords, agents and building managers in Knebworth and across Hertfordshire can book any of our surveys. For a price for a let property or a block, ring 07833 053749 or use the contact form.
What you can safely check yourself
The one thing to avoid is getting up close. Slates, tiles, flat roofs and rooflights can give way, and a fall can be serious. That is where a survey comes in, using safe viewpoints and a drone where applicable.
If you have a loft with safe access, take a look inside. Take a torch and only step on boards or joists, and look for staining, damp timber or daylight coming through.
Flat and commercial roofs around Knebworth
Slate and clay tile are the usual coverings on older South East houses, with concrete tiles on many later estates, with flat-roofed extensions, dormers and garages common everywhere. Mixed in with those pitched roofs are lots of flat ones, over rear extensions, dormers, garages and shops. Knebworth House, about 1.3 miles north-west, is one of the historic houses in the wider area around Knebworth. Period homes nearby can have lead valleys, tall chimneys and a patchwork of past repairs, and a listed home or one in a conservation area may need consent for changes of material.
For site and facilities teams at buildings such as Knebworth Primary and Nursery School, large flat roofs, common on schools and other public buildings, need their outlets, upstands and coverings checked regularly. The streets around a church such as Church of St Martin are often among the oldest in a place, and if your house is among the older ones nearby, any flat roof added at the back or on a dormer is likely to be far younger, and less durable, than the main roof. If you let a flat or house near Knebworth station, the flat roof over a let home is worth a look before it becomes a tenant complaint.
Knebworth is about 3 miles south of Stevenage, in Hertfordshire. Knebworth is one of many places we visit across Hertfordshire. Knebworth is one of the towns and villages in Hertfordshire where we work. London is in our area too.
Postcode districts we cover here for flat roof surveys: SG3. You’ll find streets such as London Road, Deanscroft and Lytton Fields, all of which we cover. Other places close to Knebworth include Woolmer Green (1 mile south), Bragbury End (1 mile north-east), Oaklands (2 miles south), Datchworth (2 miles south-east) and Shephall (2 miles north). Within a short drive, we also cover Hemel Hempstead (14 miles south-west), Stevenage (3 miles north), St Albans (10 miles south-west), Bishop's Stortford (15 miles east), Welwyn Garden City (5 miles south) and Harpenden (8 miles south-west).
Landmarks near Knebworth
We work in homes and buildings around Barnwell School and Knebworth Park and the streets around them. There is a railway station in Knebworth itself: Knebworth station. Well-known places in the area include Benington Castle (3.6 miles north-east) and Datchworth Museum (1.7 miles south-east). Green spaces nearby include Mardley Heath.