How to Choose a
Guttering Contractor
A practical checklist to separate qualified specialists from cowboy traders — and the exact questions to ask before any money changes hands.
What every qualified guttering contractor should provide, without being asked
- 1BBA or equivalent product certification
- 2Public liability insurance (min. £2m)
- 3Insurance-backed installation guarantee
- 4Verifiable references or portfolio
- 5Written, fixed-price, itemised quote
- 6On-site fabrication capability
- 7No large upfront deposit required
A poorly installed guttering system can cause damp, structural damage, and voided building warranties — and by the time you notice, the contractor is long gone. Each point in the checklist above is explained below, along with the red flags that should make you walk away.
1Does the contractor hold BBA certification?
BBA certification — issued by the British Board of Agréement — is the UK's most rigorous independent accreditation for construction products and installation systems. For guttering, it means the product has been independently tested for performance, durability, and weather resistance to a defined standard. Not every guttering contractor works with BBA-certified products. Most don't.
A BBA certificate gives you independent proof that the system installed on your property has been tested and verified by a third party — not just the manufacturer's own claims. It is also a prerequisite for most insurance-backed guarantees, and increasingly required on new-build and commercial projects.
Ask this: "Is the guttering system you're installing BBA certified? Can you provide the certificate number?" Any qualified specialist will answer immediately. Vagueness here is disqualifying.
2Is the contractor properly insured?
A guttering installation involves working at height, on scaffolding, adjacent to your roof and fascia boards. Two insurance types are non-negotiable before any work begins.
- Public liability insurance covers damage to your property caused by the contractor. The minimum acceptable level for residential work is £2 million. Ask to see the certificate — not just a verbal confirmation.
- Employers' liability insurance is a legal requirement if the contractor employs anyone, including subcontractors. If a worker is injured on your property and this cover is absent, you may face civil exposure.
A reputable contractor will produce both certificates without hesitation. If they delay, make excuses, or say the paperwork is "in the van" — treat this as a hard stop.
3What guarantee does the installation come with?
There are two types of guarantee in the guttering industry, and the difference matters significantly.
Manufacturer's product warranty covers the guttering material against defect. It does not cover the installation. If the guttering fails because it was fitted at the wrong fall, a product warranty offers you nothing.
An insurance-backed guarantee (IBG) covers both the product and the installation workmanship — and crucially, remains valid even if the contractor ceases trading. This is the standard you should insist on. For seamless aluminium guttering, a 30-year insurance-backed guarantee is achievable and should be your benchmark. A one-year workmanship guarantee is inadequate; anything less than ten years warrants scrutiny.
Ask this: "Is the guarantee on the product only, or does it cover the installation workmanship too? Is it backed by an independent insurer? What is the duration?"
4Can they show you verified references and past work?
Any established guttering contractor should be able to point you to completed installations — photographs, Google reviews with responses, or direct client references for commercial projects. The key word is verified: reviews on Google Business Profile are harder to manipulate than testimonials printed on a contractor's own website.
For residential work, check:
- Google Business Profile — volume, recency, and whether the contractor responds to reviews
- Checkatrade or Trustatrader profiles where applicable
- Photographs of actual completed jobs, not stock imagery
For commercial or larger-scale projects, ask for a client reference you can contact directly. A contractor who hedges on this is telling you something important.
5Is the quote written, fixed-price, and itemised?
A verbal quote is not a quote. Before any work is agreed, you should receive a written document that includes:
- Full scope of work (replacement, repair, or new installation)
- Materials specified by name — profile size, material, RAL colour reference, BBA certificate number
- Total price with VAT itemised separately
- Payment schedule, start date, and estimated completion
- Guarantee terms and the contractor's insurance details
Watch for unusually low quotes — these often indicate inferior materials, absent insurance, or a contractor who will add costs mid-job. A request for more than 25–30% upfront before work begins is also a common precursor to incomplete work or disappearance. If a contractor is reluctant to put the details in writing, they are protecting themselves — not you.
6Seamless or sectional — does the contractor fabricate on-site?
Most homeowners don't know to ask this question. It's where the quality gap between contractors is widest.
Most contractors install sectional systems: pre-cut lengths jointed together on-site. Every joint is a potential future leak point. Over time, joints expand and contract with temperature changes, sealant degrades, and the system fails at precisely the points where it was always weakest.
Seamless guttering is fabricated to the exact required length on-site using a mobile roll-forming machine. There are no joints along the run — only at corners and outlets. The result is a continuous system with no inherent weak points and a significantly longer service life. Seamless aluminium guttering fabricated on-site is the specification you should be asking for.
Ask this: "Is the guttering fabricated on-site to a continuous length, or is it installed in sections with joints?" A contractor who installs seamless systems will have a mobile fabrication unit and will explain the process clearly.
7Red flags: walk away if you see these
- Cold calling or door-knocking — legitimate specialists don't solicit work this way. This approach targets homeowners with inflated prices or unnecessary work.
- Pressure to decide immediately — "the price goes up if you don't book today" is a tactic designed to prevent you getting comparison quotes.
- Cash-only payment — no paper trail means no recourse if something goes wrong.
- No physical business address — a contractor with only a mobile number is difficult to pursue in a dispute.
- Reluctance to provide documentation — insurance certificates, BBA certificates, and guarantee documents are standard issue. Any hesitation is a hard stop.
- Unrealistically fast turnaround promises — a proper seamless guttering installation done correctly takes time. Speed promises often signal corner-cutting.
Frequently asked questions
How much should a guttering contractor charge?
For seamless aluminium guttering supply and installation, expect to pay from £30–35 per metre installed. A typical semi-detached with 20–25 metres of guttering will cost £600–£900, depending on access, existing fascia condition, and profile specification. Quotes under £20/m almost always involve sectional plastic systems installed without guarantees.
Is BBA certification the same as FENSA registration?
No. FENSA registration applies to window and door replacement contractors. BBA (British Board of Agréement) certification applies to construction products and installation systems, including guttering. They are separate accreditation bodies covering different trades. For guttering work, BBA is the relevant certification to check.
Can guttering be installed without scaffolding?
It depends on height and access. For single-storey work, ladder access is typically sufficient. For two-storey or higher, most professional contractors will require scaffold, a tower, or a mobile elevated work platform (MEWP) to comply with Working at Height Regulations 2005. Any contractor offering to complete two-storey work from a ladder alone should be treated with caution.
Should I get multiple quotes for guttering work?
For any job over £500, three quotes is sensible practice — not just to compare price, but to establish a baseline for what a reasonable specification looks like. The contractor who provides the most thorough written quote is usually the most professional operator.
What should a guttering contractor's written quote include?
A complete quote should include the full scope of work, the product specification (profile size, material, RAL colour reference, BBA certificate number), total price with VAT separately itemised, payment schedule, start and completion dates, guarantee terms with duration, confirmation of whether the guarantee is insurance-backed, and the contractor's insurance certificate details.
Get a written quote from BBA-certified specialists
Bespoke Guttering installs on-site fabricated seamless aluminium guttering across London, Surrey, Kent, Essex and the South East. Every installation comes with a 30-year insurance-backed guarantee and full BBA documentation.