Rebuilds and the law (revised August 2026)
What you can and cannot do to an old Land Rover
Once upon a time, building a 'special' Land Rover was very simple. You took an old Range Rover chassis and running gear, shortened the chassis and welded a few bits onto it, dropped Series 2 or 3 bodywork on top and called the result a 'hybrid'. You used the chassis plate and registration number from the Series vehicle because the end result looked like a Series, not a Range Rover. Hybrids were hugely popular back in the days when Defenders were new and expensive, and rusty Range Rovers were almost free.
But all good things must end, and the old system which allowed you to do pretty much anything to a Land Rover as long as the end result could pass an MoT, was brought to an end by two separate developments. The first was the introduction in 1995 of the tax exemption for historic vehicles, initially on a 25-year rolling basis, more recently dragged back to 40 years. This meant that, for the first time, the identity of a vehicle could make a big difference to the amount of road tax paid. The second was the introduction in 1998 of the Single Vehicle Approval (SVA) test. Intended to regulate the kit-car industry, the new test resulted in a tightening of the definitions of what constituted a self-built, as opposed to rebuilt vehicle.
So the authorities published guidance to define the circumstances in which a rebuilt or modified vehicle could retain its original identity (and in the case of a pre-1973 vehicle, its tax-exempt status). The guidance distinguished itself by being simple and hard to understand at the same time. The main problem is that it was not written with separate chassis, giant Meccano set Land Rovers in mind. So it was hard to fit old Land Rovers into some of the definitions used in the guidance.
In August 2025, while I was busy clearing my old Norfolk workshop, the Government quietly slipped out a set of very major changes to the rules on rebuilding vehicles to try and tidy up some of the anomalies. That doesn't seem to have had a lot of attention within the Land Rover world. I certainly didn't know about it until very recently. Having gone through the latest DVLA guidance in some detail I have rewritten this article to reflect what I believe to be the current situation.
Disclaimer: I’m not a lawyer. What I have written here is my own understanding of the rules as they are now, based entirely on DVLA’s own published rules and guidance. Where anything in the rules seems unclear to me I have pointed that out below and you should seek further clarification from DVLA as appropriate. Remember also that I am giving this advice as a business rather than a private individual so I can’t say something like “just ignore the new rules, no-one will ever know” which is what you will read if you ask about the new rules on any Internet forum. All I can do here is explain what the law says and how to comply. Whether you choose to comply is up to you.
Chassis replacement
The main point is that you are now required to notify DVLA of a chassis replacement. There's a form, and a long list of supporting photos and documentation. There is good and bad news in there. The good news is that: (1) This establishes a formal procedure to notify a chassis replacement. Previously people were telling DVLA about their chassis swap because they thought they should, and the response you got depended on whose desk your letter landed on. Worst case was that DVLA would confiscate your vehicle’s identity and insist on an IVA test and “Q” plate even though that wasn’t what the rules said. That shouldn’t happen any more. (2) The new rules explicitly state that galvanising a new chassis is allowed. Previously some people were refusing to claim MoT exemption on 40+ year old Land Rovers because they were worried that a galvanised chassis would be seen as a major modification. No worries now.
The bad news is that the list of supporting evidence to notify a chassis change is quite long and there are a couple of things in there that are going to cause a major headache for some rebuilders. The DVLA guidance is here:
The documentation required to notify a chassis change includes:
Form V627/1 https://assets.publishing.service.gov.uk/media/6a68949383f71b8684d020df/v627x1-vehicle-parts-statement.pdf
Photographs of:
the whole vehicle, including front, back, sides, interior and the registration number plate
the stamped-in VIN or chassis number of the existing chassis,
VIN plate and its location on the vehicle
the engine number of the existing vehicle
Copy of invoice from the supplier of the chassis showing its specification which must match that of the original i.e. no coil-sprung Series chassis
If you are just doing a straightforward chassis swap on a standard original vehicle, you should normally be able to comply with that. There are however several elephant traps in there which could make life difficult. Main ones:
It is unclear from the wording whether DVLA want photos before the chassis swap or after. INF318 states that “you should only make your notification if your vehicle is fully built, complete and ready for road use” but the guidance on the photos is unclear. If you have already dismantled the vehicle and it turns out DVLA want pre-restoration photos this could be a problem. This needs clarification from DVLA.
The one photo that is definitely “before” is the stamped number on the old chassis. There is a fair chance that you won’t have one: front dumbirons (where the number is stamped) are one of the first bits to get replaced on a Series chassis. Or you might already have stripped the vehicle for restoration and weighed the chassis in for scrap. I’m not going to offer any suggestions as to how you might get around that one.
Pre-1980 vehicles are not required to have a VIN plate for MoT purposes, so if yours is missing you’ll need to get a replica plate stamped up and fit it in the appropriate place: usually firewall to around 1973, radiator panel 73-79, front face of bulkhead 80-84, and on the brake pedal box for Defenders.
The engine number will need to match the one on the V5. If it doesn’t you will need to get that changed, and DVLA will want evidence. That usually means getting a garage to write you a letter confirming the engine number, size and fuel type, which you can send to DVLA along with the V5. If you have changed fuel type i.e. petrol to diesel the guidance implies that you need a receipt for the new engine: I suspect in practice that a confirmation letter from a garage will suffice. The wording on the guidance is vague and unclear.
If you change the body colour, or someone changed it previously, it might not match what is on the V5. I’ve never had to notify a colour change but it looks as though you just have to send in the V5 with the new colour.
DVLA guidance on notifying changes to the V5 is here: https://www.gov.uk/change-vehicle-details-registration-certificate
What if your engine doesn’t have a number? Tricky. A missing number doesn’t mean it has been stolen (although it might): an engine rebuilt on a new Genuine Parts block won’t have a number, and for some years Land Rover factory rebuilt engines had the number stamped on a plate glued to the block, which often falls off. All you can do here is stamp in an identifying number, even if it’s just the date and your initials, send your V5 to DVLA and hope for the best. Finally, some V5s don’t have an engine number recorded and I have no idea what happens if you send DVLA a photo of your engine number and the V5 field for the engine number is blank.
This is what happens when you introduce “one size fits all” regulations. The new guidance recognises that chassis replacement is a repair rather than a modification but it is the ONLY item in the list of repairs in INF318 that has to be notified to DVLA. No-one seems to know what problem this is trying to solve.
There are a few other items in the new guidance which might be more useful to us:
The guidance now allows the reuse of a second hand chassis subject to certain conditions (mainly traceability). In practice I’m not sure how useful this will be as the guidance states you are not allowed to reuse a chassis (or any other major components) from a vehicle that has been issued with a Certificate of Destruction. I think that is a drafting error as I haven’t seen it anywhere else and I’ve even read through the legislation that covers the CoD issuing system. Can anyone clarify? In theory you can reuse a chassis that has been removed for replacement but just needs a bit of welding, but I’m not sure what will happen in practice if the donor vehicle hasn’t had its own chassis replacement notified to DVLA. Can of worms, I suspect.
You are now allowed to build up a Land Rover from bits provided it is a reasonably faithful reproduction of a factory model more than 40 years old. Previously there was no procedure for doing this. All the major bits must be over 40 years old and you will need the support of a recognised club to certify and date the vehicle so you can get an age-related registration for it. However, given that the chassis needs to be over 40 years old and that DVLA want to see invoices for all the major components I suspect this is a non-starter. I haven’t looked into the fine detail though.
Structural modifications: there is now a procedure allowing you to, for example, lengthen or shorten the chassis, modify crossmembers and outriggers etc while still retaining the vehicle’s original identity. I haven’t looked into this in detail but it appears on the face of it as though something like a bobtail Range Rover would be OK, but welding coil spring mounts onto a Series chassis would not. You’ll need to get the results of your labours MoT’d even if it is over 40 years old but that is probably not a bad thing. There’s a form https://assets.publishing.service.gov.uk/media/6a689aa23c7198e7d0a4c1a6/v627x3-modified-vehicle-statement.pdf and it looks like it is easier (in paperwork terms) to shorten your chassis than replace it. That’s mad, but I don’t make the rules.
The sting in the tail with all of this is that where there is now a formal procedure and you don’t comply with the procedure, DVLA have a book to throw at you. I have no idea what the chances are of getting caught. I doubt DVLA will be putting any new resources into enforcement: as before, they will be relying on MoT testers and the general public to report dodginess. One area where you could be in real trouble is if the vehicle is involved in a serious road accident and the chassis replacement or modification turns out to be a factor. You also need to consider what happens if the vehicle is crashed, stolen or set on fire, you try to make a claim and your insurers find you haven’t notified DVLA of notifiable changes. We all know what insurers are like. If I was still rebuilding Land Rovers for customers I would 100% be following the rules here.
Engine swaps
The one area INF318 is absolutely silent on is engine changes, which was a bramble patch of badly worded rules and guidance before and still is now. Here is the situation as best I can make it out:
Like for like engine change: no problem but you will need to notify DVLA of the new engine number which will require supporting documents as mentioned earlier.
Engine conversions of any kind: need to notify DVLA of new engine number, size and fuel type, with supporting docs. Conversions are not covered by either form V627/1 or V627/3
Electric conversions: covered by INF318, follow the procedure and you should get it moved into the electric car tax band but here’s a thing:
“Cars and light goods vehicles first registered on or after 1 March 2001 are taxed according to the CO2 emission figure. When a vehicle has been converted to electric propulsion, the law requires DVLA to retain the CO2 emissions figure recorded at first registration. This means the vehicle must remain in a CO2 based tax class and cannot be moved into the electric tax class.” Source: INF318
So if you have a post 2001 Land Rover and want to electrify it, don’t bother. Do an earlier one. What I cannot find anywhere is whether you can legally do an engine conversion on a post 2001 vehicle as the CO2 figure (on which tax is based) stays with the original engine. So can you fit a Chrysler Hemi to a Defender in place of a TDCi? Please drop me a line if you know the answer because I’m really struggling here.
But… MoT exemption rules
For a few years now vehicles over 40 years old have been tax and MoT exempt subject to certain conditions. The latest guidance as at August 2026 is here: https://www.gov.uk/government/publications/historic-classic-vehicles-mot-exemption-criteria/historic-classic-vehicles-mot-exemption-criteria--2
Basically, if a vehicle over 40 years old has had any “substantial change” it does not qualify for MoT exemption. This is where we get into a world of complication, because although the guidance above says that a modified vehicle might not qualify for tax exemption, the guidance on tax exemption just says that if it’s over 40 years old it’s tax exempt https://www.gov.uk/historic-vehicles So I’m going to ignore tax altogether here and just concentrate on MoT exemption. Here are the key points from the MoT exemption guidance, my comments in italics:
“Alternative cubic capacities of the same basic engine and alternative original equipment engines are not considered to be a substantial change.” So any of the 2.25/2.5 iron block OHV engines, petrol and diesel, are interchangeable. They are all the same basic engine. Is a 200TDi part of the same family? Arguably so, same crank, cam, flywheel as the 12J and most of the same basic dimensions and mounting points as a 1958 2.25 petrol. 300TDi? Getting onto slightly shakier ground but might still be OK. I wouldn’t lose sleep over it.
“It does not count as a ‘substantial change’ if:
changes are made to preserve a vehicle because the original type parts are no longer reasonably available
they are changes of a type which can be demonstrated to have been made when vehicles of the type were in production or within 10 years of the end of production
axles and running gear have been changed to improve efficiency, safety or environmental performance
changes were made to vehicles that were previously used as commercial vehicles, and you can prove the changes were made when the vehicle was used commercially
engine – alternative cubic capacities of the same basic engine, or alternative original equipment engines - where the number of cylinders is different, this is typically (but not always) non‑original equipment”
I reckon that covers just about any engine swap not already covered by (1). Straight six to TDi? Try finding a water pump for a 2.6. 200TDi to Ninety? Land Rover were offering that conversion as a factory mod in 1991. Improved efficiency? The 200TDi in my Series does 35mpg. I’d be lucky to see 25 with the old two and a quarter diesel. Previously used as commercial vehicles? That’s the Perkins 4.203 taken care of, at one time half the farm Land Rovers in Lincolnshire had Perkins engines. Alternative original equipment engines? Hello Rover V8, maybe stretching a point to argue that the Stage One V8 was part of the Series III range, but on the 90 and 110 you’re free and clear.
What might not be covered? OM606 and M57 into Series might be pushing your luck a bit. 3.9 EFi Rover V8 into a Series II is stringing several different exemptions together. But my opinion, based on DVLA’s guidance, is that an engine conversion will in almost all circumstances allow you to continue claiming MoT exemption.
Other modifications
Changes to body and interior appearance don’t appear to count as a substantial modification and neither do the fitting of accessories.
Braking and suspension improvements (disc brakes, parabolic springs, brake servo and so on) should be covered by the exemption for improving safety. Likewise improved lighting or different tyres. You don’t have to run 6.00-16 Traction Mileage crossplies to keep your MoT exemption.
Power steering conversions: there are several types. The ones that involve welding brackets to the chassis to take a P38 steering box are, in my opinion, a major structural modification which should be declared using the V627/3 procedure. The bolt on products (hydraulic ram and electric column) that don’t involve structural modifications should not need declaring. Does power steering count as a “substantial change” for MoT exemption purposes? I don’t know, but you could argue that it improves safety, in which case you’re free and clear.
Gearbox swaps (4 to 5 speed, manual to automatic) are fine, not notifiable unless you start chopping chunks out of the chassis to make them fit, and not on the list of “substantial changes” for MoT exemption purposes.
In summary - before you start building up your dream Land Rover, make sure you know and understand the rules. If you are looking to buy a heavily modified vehicle, satisfy yourself that it meets the legal requirements. That especially applies to Series-shaped coil sprung specials: unless they were built before 1998 or have had an IVA/SVA test they are unlikely to be fully compliant with the rules.
If you have found this information useful, please consider supporting my work by buying me a virtual coffee here. And if you see anything here that you think is incorrect, or you have more information to add, feel free to contact me. I am especially keen to hear people’s experience of how DVLA are implementing the new rules in practice.