The Specification for the Reinstatement of Openings in Highways, known on site as the SROH, is the document that decides whether a utility reinstatement passes or fails, and it works in two stages: an interim reinstatement that must normally be made permanent within six months, and a permanent reinstatement that then carries a two or three year guarantee. Most reinstatement disputes between undertakers and street authorities are not arguments about workmanship at all. They are arguments about which stage a site was in, when the clock started, and who is paying for the remedial visit.
England and Wales work to the fourth edition of the specification, issued under the New Roads and Street Works Act 1991 and available through the Department for Transport’s street works reinstatement guidance. Scotland has its own reinstatement specification and its own inspection code, so a scheme north of the border is judged against a different document with different clause references. Site managers working across borders should confirm which specification applies before pricing remedial risk.
Interim and Permanent Reinstatement Are Two Different Duties
Interim reinstatement means the excavation has been backfilled and compacted in proper layers up to finished surface level, with a surface that is safe, trafficable and to the required skid resistance, but where the final surfacing has not yet been laid. Cold applied reinstatement materials are common at this stage because they can be placed and trafficked immediately, which matters on a reactive job that closed at 2am. An interim reinstatement is still a compliant reinstatement, and the undertaker remains responsible for maintaining it to the prescribed standards until the permanent works are complete.
Permanent reinstatement means every layer, including the final surface course, matches the specification for that road category in material, depth and performance. Rutting, cracking, settlement, surface regularity, texture depth and joint condition are all judged against the permanent standard, not against how the trench looked on the day the crew left.
Three timings sit underneath all of that and are worth writing into method statements. An immediate temporary reinstatement, the kind thrown in to make a hole safe at the end of a shift, has to be re-excavated and brought up to interim or permanent standard within 10 working days unless the authority agrees otherwise. An interim reinstatement has to be made permanent within six months. Where ground conditions, settlement risk or coordination with a resurfacing programme genuinely justify it, a further period can be agreed with the street authority, but the agreement has to exist before the first six months expire rather than being claimed afterwards.
The Guarantee Period Starts on Completion of the Permanent Works
Guarantee periods run for two years from completion of the permanent reinstatement, extending to three years where the depth of cover over the apparatus exceeds 1.5 m. The trigger is completion of the permanent reinstatement itself, not the date the interim was placed and not the date the authority was notified. A trench that sat in interim condition for five months therefore carries liability for roughly two years and five months in total, which is a number worth putting in front of anyone building a defects provision into a tender.
Re-excavation resets that clock. Where a reinstatement is dug out again, whether for remedial work, a further connection or a third party’s scheme, the guarantee on the new reinstatement starts from scratch. Long-running developer sites where the same length of carriageway is opened three or four times over a build programme accumulate overlapping guarantee periods, and keeping a straight record of which reinstatement is under guarantee until when is the difference between a defensible defect response and an expensive one.
What the Specification Actually Requires Layer by Layer
Compliance is decided by layer thickness, material class, compaction method and reinstatement dimensions, judged against the road category and the surfacing type of the existing highway. Section 71 of the New Roads and Street Works Act 1991 is what gives the specification its legal force, so a reinstatement that misses the tables is not merely untidy, it is non-compliant with a statutory duty. Trench width bands, the different treatment of flexible, composite and rigid constructions, permitted binder course and surface course materials, and the rules on joint sealing and overbanding are all prescriptive, and an inspector reading a core or a level survey is comparing measured values against those tables rather than forming a general opinion.
Site teams who lose points tend to lose them in the same three places: compaction of the sub-base in narrow trenches, surface level tolerance at the joint with the existing carriageway, and reinstating a smaller area than the specification requires around a bellmouth or an ironwork frame. McFadden Utilities, a family-run Hertfordshire utility contractor that has been carrying out water main and reinstatement works since 1980, publishes a practitioner walkthrough of the SROH reinstatement specification that sets out the layer and dimension requirements in plain English alongside the guarantee and inspection provisions, which is a faster reference for a site manager than the full document on a wet Friday afternoon.
Inspection Categories A, B and C
Street authorities inspect against three categories, and the category tells you what is being looked at. Category A inspections happen while the works are live and cover signing, lighting and guarding, excavation, materials and compaction. Category B inspections happen within six months of the interim or permanent reinstatement and look for early failure: settlement, edge depression, crowning, poor joints. Category C inspections happen in the final three months of the guarantee period, so months 22 to 24 on a standard reinstatement and months 34 to 36 on a deep one, and they test whether the reinstatement has held up.
Sample rates are set by the code of practice for street works inspections, and they are performance linked, which is the part contractors underestimate. Authorities inspect a proportion of an undertaker’s works rather than every one of them, a minimum share of that sample has to fall into each of the three categories, and the proportion inspected rises where the undertaker’s recorded failure rate rises. The banding thresholds and percentages are stated in the code and are revised from time to time, so they are worth reading from the published document rather than from memory. Poor reinstatement quality therefore buys more inspections, more chargeable visits and more defect notices, and the effect compounds across a framework rather than staying with the job that caused it.
Defect Notices and the Clock That Follows One
A defect notification arrives as a works inspection report identifying the failure against the specification. For a defect that is not causing danger, the undertaker generally has 10 working days to accept the failure, dispute it, or request a joint inspection, and agreed remedial works are normally expected within 10 working days of that agreement or joint inspection. Ignoring the notification is the expensive route, because the authority can then serve a formal notice under section 72 of the New Roads and Street Works Act 1991 requiring the remedial works within a stated period of not less than seven working days, and if the undertaker still does not act the authority can carry out the work itself and recover its reasonable costs.
Dangerous defects work differently. Where a failed reinstatement is causing danger to road users, section 72 allows the street authority to take immediate action without going through the normal remedial process and then recover its reasonable costs, so an undertaker who cannot attend quickly ends up paying for someone else’s gang. Attendance and make-safe expectations for dangerous defects come from the authority’s own procedures and from framework contract terms rather than from a single national figure, which is why undertakers on water company frameworks keep standby crews rather than pulling gangs off planned schemes. Guidance and advice notes published by HAUC UK sit alongside the specification and are worth reading with it, because several of the practical procedures for joint inspections and disputes live there rather than in the specification itself.
The Habits That Keep Reinstatements Out of Trouble
Record the completion date of the permanent reinstatement separately from the interim date on every job, photograph the trench at sub-base, binder and surface stage, and keep material delivery tickets filed against the reinstatement reference. Contested defect notices turn on what can be evidenced rather than what can be argued, and a contractor who can produce dated layer photographs and a compaction record is in a far stronger position at a joint inspection than one relying on a supervisor’s recollection.
The commercial case for getting reinstatement right is simpler than the specification suggests. Interim works made permanent on programme, layers built to the tables, and defect notices answered inside 10 working days keep an undertaker in a lower inspection sample band, which reduces chargeable inspections, reduces remedial mobilisations, and keeps the relationship with the street authority workable on the next scheme.
