Professional woodworm treatment of a timber roof structure by Preventa
10-year written guarantee from Preventa
★★★★★ 4.9/5 from 1582 reviews

Professional woodworm treatment in Sofia and across Bulgaria

Google reviews from Preventa customers

Rated by our customers, based on 1582 reviews on Google

Read our customers' reviews

Woodworm destroys silently

They work hidden inside the wood, and the damage often becomes visible only when it's too late. Learn to recognise the signs in good time.

Fine dust around wooden items

Small piles of talc-like dust under furniture or roof timbers are a sure sign of activity.

Small round holes in the wood

Exit holes 1-2 mm across are the visible result of a larval development cycle that has already finished.

A weakened structure

If the wood sounds hollow when tapped or the beams sag, you have a serious problem that needs immediate action.

Small insects around the windows

Adult beetles emerge from the wood in spring and summer. If you can see them, the infestation is active.

4-7 years to total destruction

Woodworm can destroy the load-bearing structure of your roof within 4-7 years if it isn't stopped in time.

Book a FREE inspection
anywhere in Bulgaria

  • Completely free
  • No obligation
  • Expert assessment
  • Same-day reply

* One of our team will contact you today to confirm the details and the date of the visit.

How we get rid of woodworm

We combine two techniques so that the biocide gel penetrates as far as possible, right into the core of the wood, where the larvae actually develop.

01

Free inspection and diagnosis

We carry out a free, no-obligation inspection anywhere in Bulgaria. One of our specialists visits the site and assesses the extent of the infestation, the type of woodworm and the condition of the structure, including moisture, access and risk. They then draw up a clear treatment plan, with no obligation on your part.

02

Preparing the site

We prepare the wood so that the product genuinely reaches the infested area. We clear away bark, dead wood and built-up deposits, make sure every key section is accessible and, where needed, prepare the injection points along the length of the beams and other solid timbers.

03

High-pressure injection

For solid beams with deep larval development, we use pressure injection to carry the biocide gel into the core and structure of the wood. This lets the treatment go deeper than surface application, to where the larvae actually are, and it is key in more serious structural infestations.

04

Compressor spraying

We then treat all accessible surfaces under pressure, so that the beams, cladding and other exposed wooden parts are covered evenly. This stage complements the deep treatment and delivers curative treatment, broad coverage across the whole structure and long-term protection against new infestation.

05

Documentation and guarantee

After the treatment we issue a service report and a written guarantee, tailored to the specific site and the condition of the wood. You receive a clear description of the work carried out, along with guidance for follow-up monitoring and maintenance.

ISO 9001:2015 ISO 14001:2015 ISO 45001:2018 NPMA — National Pest Management Association

Why customers across Bulgaria choose Preventa for woodworm treatment

With woodworm, the visible holes are only an outward symptom. The real problem is inside the wood. That's why we work with professional diagnosis, deep treatment and a clear solution tailored to the condition of the structure.

Free inspection across Bulgaria

We come to your site to assess the extent of the infestation, the condition of the wood and the most suitable treatment method.

A combined professional method

We combine pressure injection with compressor application, treating both in depth and across all accessible surfaces.

Work on real structural projects

We treat roof structures, beams and other wooden elements, taking into account access, the type of wood and the degree of infestation.

Service report and written guarantee

After the treatment we issue documentation for the work carried out and a guarantee, tailored to the specific site and the condition of the wood.

10 years
Written
guarantee
SECURITY · TRACEABILITY · COMMITMENT

Written guarantee

We issue a 10-year written guarantee with clearly set-out terms, a traceable record of the treatment carried out, and a commitment to respond if new activity is found.

Free follow-up treatment

If new activity is found during the guarantee period, we carry out the necessary follow-up treatment at no extra charge, in line with the guarantee terms.

Full documentation

You receive a service report for the treatment carried out, a description of the zones treated, the products used and the written guarantee terms.

Long-term peace of mind

Your roof structure is a valuable asset. The guarantee gives you peace of mind: the treatment is traceable and, should you need it, you have a clear commitment to follow-up action.

Frequently asked questions

Here are our answers to the most important questions customers ask before booking the service.

The main signs are: fine wood dust around wooden items, small round holes (1-2 mm) on the surface of the wood, and a hollow sound when tapped. If you see small flying insects around the windows in spring or summer, that is a sure sign of an active infestation.

The best time is as early as possible after you discover the problem. The sooner a specialist steps in, the better the chance of saving the structure and avoiding more serious repairs or replacement.

Yes, the inspection is very important. With woodworm, what you can see from the outside often doesn't show the real scale of the damage inside. To recommend the right method, give a realistic price and set fair guarantee terms, we need to see the condition of the wood on site.

In many cases the wood can be saved if you act in time. Small holes on the surface are often only an outward symptom, while the real problem develops inside the material. That's why, at the inspection, we assess whether the structure can be treated and protected, or whether some elements are already beyond saving and need replacing.

Yes, but coatings matter a great deal here, because different coatings can limit how well the product soaks in. So at the inspection we check the condition of the surface and whether the product will be able to penetrate effectively. This also affects whether a guarantee can be given.

The two methods play different roles and are often combined. Pressure spraying treats accessible surfaces evenly, while injection carries the product deeper into solid beams and structural elements, where the problem is often hidden inside the wood.

A standard treatment is completed within 1-2 working days. For larger sites it can take up to 3-4 days.

Yes. We have 17 mobile teams covering the whole of Bulgaria. Transport and travel costs are included in the price. We work in hard-to-reach areas and historic buildings too.

The price depends on the area of the wooden structure, the linear metres of beams, the degree of infestation, how accessible the elements are and how far away the site is. We carry out a free inspection and prepare a detailed quote.

Neither people nor pets should be in the treated rooms during the treatment. Once the product has soaked into the wood and the required ventilation time has passed, the rooms can be used again by people and animals alike. After every treatment we give you clear instructions on when access can be restored.

That depends on the type of property, the scale of the treatment and the conditions on site. When we finish, we always give you clear instructions on access, airing and next steps, so that use of the space is safe and controlled.

There may be a slight residual smell, depending on the amount of work, the ventilation and the areas treated. It is usually temporary and is kept in check by airing the rooms according to the instructions we give you after the treatment.

Not immediately. With an active infestation the product needs time to work — in practice usually between 3 and 6 months. During this period the larvae gradually reach the deeply treated wood, feed on it and die. So it is possible that isolated signs of activity will still be seen for some time after the treatment. At the same time, fully treating the timber from the outside creates a protective layer that helps prevent a fresh infestation later on.

The guarantee covers a free re-treatment if new woodworm activity appears in the treated areas. It is issued in writing immediately after the treatment is completed. If you need us during the guarantee period, simply get in touch.

Stop the woodworm today

Every day without action means more wood destroyed. Get in touch for a free consultation and inspection. We will prepare a detailed quote specifically for your property.

Free consultation

Opening hours
Every day, 08:00 - 19:00
Google rating 4.9★★★★★ Based on 1582 reviews
Preventa - Bulgaria's No. 1 pest control company
4.9 ★★★★★
T
Talip Chavdarov
19/10/26
★★★★★
Proven quality !!!
Translated review ·
K
Kalina Parvanova
17/10/26
★★★★★
We are extremely satisfied!
Translated review ·
J
Jason Armstrong
17/10/26
★★★★★
Took care of everything I needed such a great and professional person! Hope to use again! I will refer to all my friends
J
Jack Levinson
15/10/26
★★★★★
Samy, thank you for helping us. You did a wonderful job!
R
Radostin Ivanchev
14/10/26
★★★★★
Reliable company
Translated review ·
D
Darren Buckner
14/10/26
★★★★★
I’m very satisfied with the cockroach treatment service! The team was professional, friendly, and efficient. They explained everything clearly and did a great job. Excellent customer service and a smooth experience from start to finish. Highly recommend this company to anyone dealing with pest problems!
V
Vishnu Vinod
14/10/26
★★★★★
Great service & highly professional team. They were friendly, responsive, and explained the treatment process clearly. Everything was handled efficiently, and the communication was excellent. Highly recommended for pest control services!
I
Ilian Hadzhijski
13/10/26
★★★★★
Good offers and very fair.
Translated review ·
V
Victoria Kostova
13/10/26
★★★★★
Sami is a great professional! Thanks for the quick response!
Translated review ·
K
Karadjanov
12/10/26
★★★★★
Very good
V
Valentin Kostadinov
12/10/26
★★★★★
Top quality!!!!
Translated review ·
D
Dobromir Varbanov
11/10/26
★★★★★
Reliable and effective!
Translated review ·
D
Daniel Paskov
11/10/26
★★★★★
Very good!
Translated review ·
I
Ivelina Ilieva
09/10/26
★★★★★
Extremely professional and fair attitude! I recommend them!
Translated review ·
I
Ivan Todorov
07/10/26
★★★★★
Only those who have lived through it can understand the horror of having bed bugs as roommates. Thank you to the whole team for ridding me of these vile creatures, and nothing personal, but I hope I never need your services again.
Translated review ·
Z
Zdravko Sergiev
07/10/26
★★★★★
Professional treatment and conduct by the operator and the person who does the spraying
Translated review ·
V
Viaggio in Marocco
29/09/26
★★★★★
Excellent service from start to finish. The team was professional, punctual, and very easy to communicate with. They explained everything clearly and did the job carefully and efficiently. I was especially impressed by their attention to detail and how seriously they take their work. Very reliable company and great customer service. I would definitely use their services again and highly recommend them.
I
Ivo Vladimirov
27/09/26
★★★★★
The bug terminators
Translated review ·
V
Vladislav Pashaliev
25/09/26
★★★★★
Top
P
Petar Todorov
25/09/26
★★★★★
fair and meticulous!!!!
Translated review ·