If you have rented a period cottage off Church Street or Mill Lane in Welwyn village, you already know the airing cupboard and the bathroom scale are where the inventory clerk slows right down, pen out, and the move-in photos come up on the phone. That is the part most tenants underprice, and it is the part we clean for a living.
Last updated April 2026. Written by the Monster Cleaning Ltd team (Companies House 9919639), end of tenancy cleaners working across Welwyn, Hertfordshire AL6 and the wider Welwyn Hatfield borough.
Here is the short version. We are Monster Cleaning Ltd, we clean rented homes in Welwyn village against a 57-point agent-approved checklist, and a one-bed end of tenancy starts at £207 with a 48-hour re-clean guarantee. That sentence is the answer to the question most people ring us with. Everything below is the detail behind it: what gets deducted here, which streets and property types the clerks treat carefully, what it costs, and how the booking actually works.
We are not a Welwyn Garden City firm with a Welwyn page bolted on. The garden city is a separate place about three miles south, all Ebenezer-Howard planned housing and tree-lined avenues off Handside Lane. The village of Welwyn (the old AL6 settlement on the River Mimram, the one with the Roman Baths preserved nine metres down under Junction 6 of the A1(M)) is a different job entirely, and the housing proves it. The village core is timber-framed and Georgian and Victorian coaching-village stock around St Mary’s and the old Great North Road, with interwar and post-war infill toward the station and a band of larger modern and executive houses on the outskirts. Cleaning a low-ceilinged 1700s cottage off Church Street against a thick period inventory is not the same task as cleaning a 1920s garden-city house, and pretending otherwise is how tenants lose money.
Why Welwyn deposits get deducted
The deposit dispute pattern here is not complicated, and it is mostly about the age of the buildings and the water. Welwyn is an affluent commuter village, so the rented stock skews toward well-kept period houses and shared houses let by tenants working in Stevenage, Hatfield, Welwyn Garden City and London off the fast trains from Welwyn North. The properties are generally looked after. What costs people money is not neglect, it is the specific things an inventory clerk checks in an old building that a tenant does not think to clean: the scale the very hard water leaves on every fitting, the soot in an inglenook, the dust on a beam at head height, the grease behind a freestanding cooker in a small period kitchen. Three areas come up again and again.
The Renters’ Rights Act 2025 raised the bar on “clean”
Since the Renters’ Rights Act 2025 came into force, the old “professional clean” clause that landlords used to slip into tenancy agreements is no longer enforceable as a blanket requirement. You are not obliged to hire anyone. What has not changed is the standard the property is judged against: you have to return it in the condition recorded at check-in, fair wear and tear aside. On Welwyn’s older stock that check-in inventory is usually thick, because there is a lot of original fabric to itemise. A clerk who logged the condition of a 1700s exposed brick fireplace, a Georgian timber-framed door and the grout in a small period bathroom will check every one of those line items on the way out, and they will do it with the move-in photographs open on a tablet next to them. The practical effect of the Act for a Welwyn tenant is that the argument is no longer “was it professionally cleaned”, it is “does it match check-in”. That is a higher bar in an old house than in a new flat, because there is simply more itemised fabric to fall short on. If you want the clean reviewed against the deposit scheme rules, the adjudication guidance from the Tenancy Deposit Scheme is worth reading before you hand the keys back, not after, because adjudicators weigh check-in and check-out evidence side by side and a hand-back clean that visibly matches the move-in photos is the cleanest way to keep the full deposit.
Welwyn Hatfield’s licensing position is a quirk worth knowing
Welwyn village sits in Welwyn Hatfield Borough Council. The local quirk that catches landlords and tenants out: the borough runs only mandatory HMO licensing and has no selective or additional licensing scheme across Welwyn at all, unlike several neighbouring authorities. That means a lot of shared houses in the village are let on standard ASTs with a thorough check-in inventory doing the protective work the council scheme does elsewhere, so the move-out clean is judged hard against that document. If you are in a licensable HMO, the rules and fees are on the council’s own pages at welhat.gov.uk. It does not change the cleaning standard, but it tells you why the inventory clerk’s report carries so much weight in this particular borough.
Very hard water is the biggest single deduction here
This is the Welwyn-specific one. The village is supplied by Affinity Water from the chalk aquifer, and the water is genuinely very hard, around 307 mg/l of calcium carbonate across the AL6 postcode by Affinity Water’s own hardness data. In practice that means scale builds fast on every shower screen, tap, kettle element and toilet pan in the village, and it builds faster in the older bathrooms where the enamel and chrome are not new. We see more deposit money lost over hard-water scale in Welwyn than over anything else, including carpets. A cloudy shower screen and a scaled kerb round the bath read as “not cleaned” to a clerk even when the tenant scrubbed for an hour with the wrong product. The honest problem is that a supermarket bathroom spray will not shift hardened scale from a year of AL6 water; it needs a proper descaling job, the right product, dwell time and some patience, and most tenants neither have the kit nor want to spend a moving day on their knees with a screen that will not come clear. That is the single most common reason people in the village ring us, and it is the one part of a Welwyn clean we never rush.
“Monster came on a Thursday. I’d had a room and shared the rest of a Georgian end-of-terrace just off Prospect Place for about fourteen months, single tenant, working in Stevenage and renting cheap in the village. The house was fine, I kept my bits tidy, but the bathroom was the problem. The water in Welwyn furs everything up and the shower screen and the taps had gone properly cloudy and crusted over the year, plus the chrome round the basin. I’d tried a supermarket spray and a bit of elbow grease and barely shifted it. The Monster two came in and the bathroom took them the best part of two hours on its own, descaling the screen, the taps, the showerhead and the pan back to clear. The clerk’s check-out note literally said ‘bathroom returned to check-in standard’. I got the full £950 back. For a fourteen-month let where I’d half given up on that screen, that was the bit I’d written off.” — Daniel, former tenant, off Prospect Place AL6
Streets and inspection patterns in Welwyn
We work the whole AL6 village and the parish settlements around it. Typical streets and zones on our Welwyn rounds:
- Church Street and the conservation core around St Mary’s
- High Street, Prospect Place and the parade by the White Hart
- Mill Lane and the lanes down toward the River Mimram and Singlers Marsh
- Codicote Road and the northern edge of the village
- London Road and the approach from the A1(M) Junction 6
- Danesbury Park Road and the larger detached plots on the village outskirts
- The interwar and post-war infill streets between the old core and Welwyn North station
- Digswell and the roads near the Digswell Viaduct, in the same parish
- Mardley Heath and Oaklands on the parish edge
What the inventory clerks flag here is fairly predictable once you have cleaned enough of these properties. In the conservation-core cottages off Church Street and Prospect Place, the recurring problems are exposed brick and inglenook fireplaces full of fine soot and dust, low oak beams and door heads that nobody dusted in months, deep window reveals on single-glazed period frames, and bathrooms where the very hard water has scaled everything chrome. The Georgian and Victorian end-of-terrace houses, a lot of them shared, get marked on kitchen grease behind freestanding cookers, scaled kettle and tap areas, and tired grout in small original bathrooms. The interwar and post-war semis toward the station are a different check: clerks there spend their time on oven interiors, extractor grease, scuffed skirting and carpet edges in the bedrooms. The larger modern and executive houses on the village outskirts, around Danesbury Park Road, get a long appliance check (range cooker, double oven, integrated dishwasher) and a sharp look at en-suite shower screens, which scale fastest of all in this water. On the period stock specifically, the airing cupboard and the loft hatch surround are nearly always opened and checked, because move-in photos exist of both and tenants almost never clean them. We clean to that report, not to a generic checklist, which is why the agent-approved version runs to 57 points rather than a tidy ten.
What’s included in a Welwyn end of tenancy clean
End of tenancy is the hand-back clean, the one judged against your check-in inventory. It is not a deep clean for a place you are staying in, and it is not a regular tidy. The work below is the hand-back one, and it is the same scope whether the property is a one-room share off Mill Lane or a four-bed off Danesbury Park Road.
Kitchen
Oven cleaned inside to the enamel, including the door glass, racks and trays. Hob and splashback degreased. Extractor or hood degreased and the metal filter soaked. We pull out the cooker and the freestanding fridge or washing machine where they move safely, because in the older village kitchens the grease and crumb build-up behind a freestanding cooker is a near-guaranteed clerk note. Cupboards wiped inside and out, handles done. Sink and taps descaled properly (this is hard-water country, so taps and the kettle area get real attention, not a quick wipe). Tiles and grout scrubbed. Floor washed last.
Bathroom
This is the room that wins or loses Welwyn deposits, so it gets the time. Shower screen taken back from cloudy and crusted to clear glass. Taps, showerhead, basin and bath descaled. Toilet done inside and out, including the cistern top and the hinges, and the pan ring where scale collects in this water. Tiles and grout scrubbed, extractor fan vent dusted, mirror and any glass shelving polished, floor washed. If there is an en-suite, it gets the same treatment, and en-suites in the newer outskirts houses are usually the worst for screen scale.
Bedrooms and living rooms
Skirting, picture rails and any dado rails wiped down, which matters in the period cottages where there is a lot of moulding to collect dust. Beams and exposed timber dusted by hand where the property has them. Window reveals, sills and the inside of the frames cleaned, deep reveals included. Built-in wardrobes and cupboards wiped inside. Light fittings, switches and sockets dusted. Carpets vacuumed thoroughly, hard floors washed. Cobwebs off the ceilings and the corners, which low-ceilinged old rooms collect quickly.
Throughout
Doors, frames and the tops of door heads. The airing cupboard, fully, including the slats and the shelf edges. The loft hatch surround. Internal glass, the staircase and banister, all skirting. Bin area cleared and wiped. We finish with a walk-through against the 57-point agent-approved checklist so the property matches the way the inventory clerk will read it, line by line.
What a Welwyn end of tenancy clean costs
Pricing is by property size, fixed before we arrive, no surprise extras on the day. Studios start at £156. One-beds are £207. Two-beds £243. Three-beds £339. Four-beds £425. If you would rather book by the hour for a part-clean or a top-up, that is £30 per cleaner per hour. Carpet shampoo is an add-on: £36 per bedroom, £43 for a living room, or £115 for whole-flat carpet across a two-bed. Oven deep-clean is included in the end of tenancy price, but if you want it as a standalone job it is £77 for a single oven, £110 for a double, and £114 for a 90cm range, the last of which is common in the larger Danesbury Park Road houses. Most Welwyn jobs we quote are one and two-bed shares in the village core and three and four-bed family houses on the edges, so the £207 to £425 band covers the bulk of what we actually do here.
EOT versus a deep clean versus a regular clean
People mix these up on the phone, so quickly. A regular clean keeps a place you live in ticking over. A deep clean is a heavy one-off, still for a home you are staying in. An end of tenancy clean is specifically the move-out hand-back, scoped and checked against your inventory so the deposit comes back. They are priced and worked differently. If you are leaving a Welwyn tenancy, the end of tenancy clean is the one you want, because it is the only one measured against the document your money depends on.
How booking works
- Tell us the address or just the AL6 postcode, the property size, and your hand-back date. Phone is fastest.
- We give you a fixed price from the bands above. No survey visit, no day-of add-ons.
- We confirm a slot, ideally after the last of your things are out and before the inventory check-out, with a little gap between the two.
- The team cleans to the 57-point agent-approved checklist and we tell you straight if anything was beyond a clean (a stain in the carpet, a damaged worktop) so it is not a surprise on the report.
- If the clerk or agent flags genuine cleaning within 48 hours of us finishing, we come back and put it right under the 48-hour re-clean guarantee. No argument, no second invoice.
That guarantee is not marketing. We have recovered over £1.2m in tenants’ deposits, we hold a 97% first-time pass rate on end of tenancy cleans, and we work to the standards expected by the 300+ letting agents whose checklists we clean against, including the agents on Welwyn High Street. Our public Trustpilot sits at 3.1 out of 5 across 128 reviews; the recurring complaint there is scheduling on busy weekends, the recurring praise is the re-clean actually being honoured, and we would rather you knew both before you book.
Related services and nearby areas
If the move needs more than the standard scope, our oven deep-clean service and carpet cleaning service can be added to a Welwyn booking, and the upholstery cleaning service is the usual add-on for furnished village lets where the sofa was on the inventory. We cover the wider county from the Hertfordshire end of tenancy hub, and we also clean in nearby Digswell and the separate Welwyn Garden City, which despite the shared name is a different place with a very different housing stock.
Frequently Asked Questions
Is Welwyn the same as Welwyn Garden City?
No, and it matters for cleaning. Welwyn is the old AL6 village on the River Mimram with the Roman Baths and the period High Street. Welwyn Garden City is a separate planned town about three miles south. The housing stock is completely different, period cottages and Georgian and Victorian houses here, planned garden-city housing there, so the clean is judged on different things. This page is the village.
How much is an end of tenancy clean in Welwyn?
Studios from £156, one-beds £207, two-beds £243, three-beds £339 and four-beds £425. The price is fixed before we arrive based on property size. Hourly part-cleans are £30 per cleaner per hour. Carpet and standalone oven cleans are add-ons priced separately.
Do I legally have to pay for a professional clean when I leave?
No. Since the Renters’ Rights Act 2025, a landlord cannot enforce a blanket professional-cleaning clause. You only have to return the property in its check-in condition, fair wear and tear aside. Most Welwyn tenants still book a professional clean because the village’s older stock and very hard water make the inventory standard hard to hit by hand.
Why is hard water such a problem in Welwyn specifically?
Welwyn is supplied by Affinity Water from the chalk aquifer, and the AL6 water is very hard, around 307 mg/l of calcium carbonate. Scale builds quickly on shower screens, taps, kettles and toilet pans, and faster in older bathrooms. It is the single most common reason tenants here lose deposit money, which is why we put real time into descaling rather than a quick wipe.
Does the Welwyn Hatfield licensing scheme affect my clean?
Not the clean itself. Welwyn Hatfield runs only mandatory HMO licensing with no selective or additional scheme across Welwyn, so most village lets rely on a detailed check-in inventory. That inventory is what your move-out clean is judged against, so it carries a lot of weight here. Licensable HMO rules are on welhat.gov.uk.
What if my landlord or agent says the clean is not good enough?
If genuine cleaning is flagged within 48 hours of us finishing, we return and put it right under our 48-hour re-clean guarantee at no extra cost. We clean to a 57-point agent-approved checklist and hold a 97% first-time pass rate, so re-cleans are uncommon, but the guarantee is there if it happens.
Do you move furniture and appliances to clean behind them?
Yes, where it is safe to do so. In Welwyn’s older kitchens we pull out freestanding cookers, fridges and washing machines because grease and crumb build-up behind them is a near-certain clerk note. We do not move anything that risks damaging old flooring or the appliance, and we tell you if something cannot be moved.
How long does an end of tenancy clean take in a Welwyn property?
A one-bed village flat is usually three to five hours with a two-person team. A three or four-bed house on the village edge can be a full day. Period cottages with a lot of beams, mouldings and a heavily scaled bathroom take longer than a same-size modern property, which we factor into the fixed price upfront.
Can you clean before the inventory check-out?
Yes, and that is the ideal order. Book the clean once your belongings are out, with a small gap before the inventory clerk’s check-out appointment. That way the property is presented to the clerk exactly as we left it, and the 48-hour re-clean window lines up cleanly with the check-out.
Do you cover the streets in the conservation core?
Yes. We regularly clean cottages and houses on Church Street, the High Street, Prospect Place, Mill Lane and Codicote Road, plus the larger plots on Danesbury Park Road and the parish settlements at Digswell, Mardley Heath and Oaklands. The conservation-core period properties are some of the most common Welwyn jobs we do.
Is the oven clean included or extra?
The oven interior is included in the end of tenancy price as standard, including the door glass, racks and trays. If you only want the oven done as a standalone job it is £77 single, £110 double, £114 for a 90cm range, the last being common in the larger outskirts houses.
What areas around Welwyn do you also cover?
We work the whole Welwyn Hatfield borough and the wider county. Nearby we cover Digswell in the same parish, Welwyn Garden City (a separate town), and across Hertfordshire from our county hub. If you are unsure whether your postcode is in our patch, give us the AL6 or AL postcode and we will confirm.