Road and Sewer Bonds
A Road and Sewer Bond is a financial guarantee required by a local highway authority or water company before it will enter into an adoption agreement with a developer. Also known as Section Bonds, adoption bonds or infrastructure bonds, they guarantee that new roads, sewers and drainage will be built to an adoptable standard – and that the authority is not left funding the work if the developer stops on site or becomes insolvent.
Aedis Surety arranges Section 38, 278, 104, 185, 98 and 220 bonds across England, Wales, Scotland and Northern Ireland, without tying up your cash or your bank facility.
Get a Quote
What is a Road and Sewer Bond?
A Road and Sewer Bond is a surety bond entered into between three parties. The developer or housebuilder is the Principal. The local highway authority or the water and sewerage company is the Beneficiary. Aedis Surety, acting through its panel of A-rated underwriters, arranges the Surety, which gives the authority a legally binding promise to pay up to the bond value if the infrastructure is not completed to the agreed standard.
These bonds sit under specific pieces of legislation – principally the Highways Act 1980 and the Water Industry Act 1991 in England and Wales, with separate regimes in Scotland and Northern Ireland. The authority will almost always insist on its own bond wording rather than an industry-standard form, which is why the wording review matters as much as the price.
Why do local authorities and water companies require them?
When a highway authority adopts a road, or a water company adopts a sewer, it takes on responsibility for that asset in perpetuity, funded by the public purse. It has no interest in inheriting a partly built estate road or a sewer that fails within a year of handover.
The bond removes that risk. If the developer ceases trading, walks away, or simply fails to bring the works up to specification, the authority can call on the bond and use the proceeds to finish or remedy the works itself.
There is a commercial dimension for developers too. Adoption agreements are frequently a planning condition, and warranty providers and conveyancing solicitors will want to see a signed agreement with security in place before plots can be sold and mortgaged. In practice, the bond sits directly on the critical path to your first completions.
Our team can provide an instant quote—ideal for tender pricing
Request a Quote today
Types of Section Bond we arrange
Different works fall under different statutory provisions. The most common bonds we place are set out below.
| Bond | Legislation | What it covers |
|---|---|---|
| Section 38 Bond | Highways Act 1980 | Adoption of new estate roads, footways and street lighting by the local highway authority. |
| Section 278 Bond | Highways Act 1980 | Works carried out to the existing public highway to serve a development – junction improvements, new accesses, traffic calming and carriageway widening. |
| Section 104 Bond | Water Industry Act 1991 | Adoption of new foul, surface water and combined sewers by the water and sewerage undertaker. |
| Section 185 Bond | Water Industry Act 1991 | Diversion of an existing public sewer, typically where a developer needs to build over or near it. |
| Section 98 Bond | Water Industry Act 1991 | Requisition of a new public sewer where the undertaker is asked to provide the connection. |
| Advance Payments Code Bond | Highways Act 1980, ss.219–220 | Security for private street works where building is proposed on a street that is not yet a maintainable highway. |
| Scottish Road Bond | Roads (Scotland) Act 1984, ss.17 and 21; Security for Private Road Works (Scotland) Regulations 1985 | Security lodged with the local roads authority under a Road Construction Consent. Required for residential developments, and must be in place before building works begin. |
If your agreement does not appear above – including Northern Irish and combined multi-section agreements – speak to us. We regularly place bonds under authority-specific and solicitor-amended wordings.
Aedis Surety
How does a Road and Sewer Bond work?
Technical Approval
You submit drawings and specifications to the highway authority or water company. It agrees the design and the estimated cost of the works.
The bond sum is set
The authority calculates the bond value from that estimate. Section 38 bonds are commonly set at 110% of the estimated cost of works, and Section 104 sewer bonds far lower. Always check your own agreement.
Underwriting
Aedis Surety reviews your accounts, the scheme and your track record, then approaches the underwriters most likely to price it competitively. We do not send your file to a single insurer and present the result as the market.
Bond Issued
We issue the bond in the authority's own wording, executed as a deed where required. The agreement can then be completed.
Works Proceed
You build the infrastructure. The bond remains live throughout.
Maintenance Period
Once the works are provisionally certified, a maintenance or defects period begins – commonly twelve months for highways, and often longer for sewers. Many authorities reduce the bond value at this point, so check whether your wording contains a step-down provision.
Adoption and Release
The authority issues its final certificate, adopts the asset and releases the bond. Only then does the liability – and the premium – stop.
The cost most developers underestimate: Adoption Delay
A Section Bond is not priced like a one-off fee. The premium is charged annually, and the bond stays live until the authority formally adopts the works – not until you finish building them.
That gap is routinely measured in years rather than months. Snagging lists, unresolved land transfers, outstanding commuted sums, street lighting energisation and simple authority backlogs all keep a bond in force long after the last kerb has been laid. Every additional year is another premium, and on a large scheme that is a real number.
Two things reduce it. First, resolve the adoption paperwork in parallel with construction rather than after it. Second, make sure your bond wording includes a step-down at provisional certification, so you are not paying a full premium on a bond that only needs to cover a maintenance obligation.
In Scotland this is not a matter of negotiation. The Security for Private Road Works (Scotland) Regulations 1985 build staged reduction into the regime, with defined release points once the road reaches binder course and again once it is substantially complete. Crucially, it is the developer’s responsibility to apply for the reduction – authorities do not do it automatically. Developers who never submit the form simply carry a full-value bond for years longer than they need to.
In England and Wales the equivalent has to be written into the agreement, and we raise it as standard when we review your wording.
It is also worth asking whether a bond is required at all on the sewer side. Several water companies now operate Section 104 bond waiver schemes for developers who meet their financial criteria – Anglian Water and Severn Trent among them. Where you qualify, that removes the bond requirement and its cost entirely, and we will tell you if that route is open to you.
How much does a Road and Sewer Bond cost?
Premiums are quoted as a percentage of the bond value and charged annually until release. As a general guide, rates typically fall between 1% and 3% per annum, though strong balance sheets and repeat schemes can price below that and first-time or highly geared applicants above it.
The main variables are your financial strength and trading history, the size and technical complexity of the works, the expected time to adoption, and the specific bond wording the authority insists on. Some authority wordings are materially harsher than others, and that shows up in the price.
We provide indicative pricing quickly so you can budget the scheme properly, and we will tell you plainly if a wording is likely to attract a loading before you commit to it.
Surety bond, cash deposit or bank guarantee?
Most authorities will accept security in one of three forms. They are not equivalent.
| Surety bond | Cash deposit | Bank guarantee | |
|---|---|---|---|
| Effect on working capital | None – no cash is lodged | Full bond value locked away for years | Usually secured against cash or assets |
| Effect on borrowing | Sits outside your bank facilities | Reduces available cash | Reduces your overall bank facility |
| Cost | Annual premium on the bond value | Opportunity cost of the capital | Arrangement and annual fees, plus collateral |
| Speed | Days once financials are provided | Immediate but expensive | Often weeks through credit committee |
| Best for | Developers who want to keep capital and bank lines free | Very small schemes | Businesses with substantial spare facility |
Aedis Surety
Why choose Aedis Surety for road and sewer bonds
Whole-of-market access. We approach a panel of specialist surety underwriters, not one insurer, so you see genuine competition on price and wording.
Wording review as standard. We read the authority’s bond before you sign the agreement and flag onerous clauses, missing step-downs and open-ended expiry dates.
No cash collateral in most cases. We work hard to avoid cash deposits and, wherever possible, personal guarantees.
Your bank facility stays intact. A surety bond does not consume your overdraft or borrowing headroom.
Support for SMEs as well as national housebuilders. Limited trading history does not automatically rule you out.
Real advisers. You deal with a named person who understands adoption agreements, not a chatbot or a call centre.
Frequently Asked Questions
How long does a road and sewer bond last?
Until the authority formally adopts the works. That typically means the construction period plus a maintenance period of twelve months or more, and in practice often longer while adoption paperwork is finalised. Bonds running for three to five years are common.
Can I get a Section 38 bond as a small developer?
Yes. Underwriters look at the scheme as well as the balance sheet. We regularly place bonds for SME developers and for companies without a long trading record, although security requirements and pricing will reflect the risk.
What happens if the authority calls the bond?
The surety pays the authority up to the bond value, then seeks reimbursement from you under the indemnity agreement you signed at the outset. A bond is a guarantee, not insurance for the developer – the ultimate liability remains yours.
Do I need separate bonds for roads and sewers?
Usually yes, because the beneficiaries are different bodies. A Section 38 bond is given to the highway authority and a Section 104 bond to the water and sewerage undertaker. They can be arranged together and underwritten as one exposure.
Can the bond value be reduced during the project?
In Scotland, yes – staged reduction is built into the Security for Private Road Works (Scotland) Regulations 1985, but you have to apply for it. In England and Wales it depends on the agreement and bond wording. Many wordings provide for a step-down at provisional certification; if yours does not, it is worth asking the authority to include one before the agreement is signed.
How quickly can a bond be issued?
Once we have your financial information and the authority’s wording, straightforward cases can be turned around in a matter of days. Complex schemes or unusual wordings take longer, and we will give you a realistic timeframe rather than an optimistic one.
How is the bond value calculated?
From the estimated cost of the works agreed at technical approval, not your contract value. Section 38 highway bonds are most commonly set at 110% of that estimate, and some authorities require more – Transport for London has used 150%. Section 104 sewer bonds are typically around 10%. There is no national rate, so always take the figure from your agreement.
Get a quote for your Section Bond
Send us your draft agreement and the proposed bond wording and we will come back with indicative terms and a plain assessment of the wording. Contact the Aedis Surety team today.